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Create run

post /threads/{thread_id}/runs

Create a run.

Path Parameters

  • thread_id: string

Query Parameters

  • include: optional array of RunStepInclude

    A list of additional fields to include in the response. Currently the only supported value is step_details.tool_calls[*].file_search.results[*].content to fetch the file search result content.

    See the file search tool documentation for more information.

    • "step_details.tool_calls[*].file_search.results[*].content"

Body Parameters

  • assistant_id: string

    The ID of the assistant to use to execute this run.

  • additional_instructions: optional string

    Appends additional instructions at the end of the instructions for the run. This is useful for modifying the behavior on a per-run basis without overriding other instructions.

  • additional_messages: optional array of object { content, role, attachments, metadata }

    Adds additional messages to the thread before creating the run.

    • content: string or array of ImageFileContentBlock or ImageURLContentBlock or TextContentBlockParam

      The text contents of the message.

      • TextContent = string

        The text contents of the message.

      • ArrayOfContentParts = array of ImageFileContentBlock or ImageURLContentBlock or TextContentBlockParam

        An array of content parts with a defined type, each can be of type text or images can be passed with image_url or image_file. Image types are only supported on Vision-compatible models.

        • ImageFileContentBlock object { image_file, type }

          References an image File in the content of a message.

          • image_file: ImageFile

            • file_id: string

              The File ID of the image in the message content. Set purpose="vision" when uploading the File if you need to later display the file content.

            • detail: optional "auto" or "low" or "high"

              Specifies the detail level of the image if specified by the user. low uses fewer tokens, you can opt in to high resolution using high.

              • "auto"

              • "low"

              • "high"

          • type: "image_file"

            Always image_file.

            • "image_file"

        • ImageURLContentBlock object { image_url, type }

          References an image URL in the content of a message.

          • image_url: ImageURL

            • url: string

              The external URL of the image, must be a supported image types: jpeg, jpg, png, gif, webp.

            • detail: optional "auto" or "low" or "high"

              Specifies the detail level of the image. low uses fewer tokens, you can opt in to high resolution using high. Default value is auto

              • "auto"

              • "low"

              • "high"

          • type: "image_url"

            The type of the content part.

            • "image_url"

        • TextContentBlockParam object { text, type }

          The text content that is part of a message.

          • text: string

            Text content to be sent to the model

          • type: "text"

            Always text.

            • "text"

    • role: "user" or "assistant"

      The role of the entity that is creating the message. Allowed values include:

      • user: Indicates the message is sent by an actual user and should be used in most cases to represent user-generated messages.

      • assistant: Indicates the message is generated by the assistant. Use this value to insert messages from the assistant into the conversation.

      • "user"

      • "assistant"

    • attachments: optional array of object { file_id, tools }

      A list of files attached to the message, and the tools they should be added to.

      • file_id: optional string

        The ID of the file to attach to the message.

      • tools: optional array of CodeInterpreterTool or object { type }

        The tools to add this file to.

        • CodeInterpreterTool object { type }

          • type: "code_interpreter"

            The type of tool being defined: code_interpreter

            • "code_interpreter"

        • FileSearchTool object { type }

          • type: "file_search"

            The type of tool being defined: file_search

            • "file_search"

    • metadata: optional Metadata

      Set of 16 key-value pairs that can be attached to an object. This can be useful for storing additional information about the object in a structured format, and querying for objects via API or the dashboard.

      Keys are strings with a maximum length of 64 characters. Values are strings with a maximum length of 512 characters.

  • instructions: optional string

    Overrides the instructions of the assistant. This is useful for modifying the behavior on a per-run basis.

  • max_completion_tokens: optional number

    The maximum number of completion tokens that may be used over the course of the run. The run will make a best effort to use only the number of completion tokens specified, across multiple turns of the run. If the run exceeds the number of completion tokens specified, the run will end with status incomplete. See incomplete_details for more info.

  • max_prompt_tokens: optional number

    The maximum number of prompt tokens that may be used over the course of the run. The run will make a best effort to use only the number of prompt tokens specified, across multiple turns of the run. If the run exceeds the number of prompt tokens specified, the run will end with status incomplete. See incomplete_details for more info.

  • metadata: optional Metadata

    Set of 16 key-value pairs that can be attached to an object. This can be useful for storing additional information about the object in a structured format, and querying for objects via API or the dashboard.

    Keys are strings with a maximum length of 64 characters. Values are strings with a maximum length of 512 characters.

  • model: optional string or "gpt-5" or "gpt-5-mini" or "gpt-5-nano" or 39 more

    The ID of the Model to be used to execute this run. If a value is provided here, it will override the model associated with the assistant. If not, the model associated with the assistant will be used.

    • string

    • AssistantSupportedModels = "gpt-5" or "gpt-5-mini" or "gpt-5-nano" or 39 more

      The ID of the Model to be used to execute this run. If a value is provided here, it will override the model associated with the assistant. If not, the model associated with the assistant will be used.

      • "gpt-5"

      • "gpt-5-mini"

      • "gpt-5-nano"

      • "gpt-5-2025-08-07"

      • "gpt-5-mini-2025-08-07"

      • "gpt-5-nano-2025-08-07"

      • "gpt-4.1"

      • "gpt-4.1-mini"

      • "gpt-4.1-nano"

      • "gpt-4.1-2025-04-14"

      • "gpt-4.1-mini-2025-04-14"

      • "gpt-4.1-nano-2025-04-14"

      • "o3-mini"

      • "o3-mini-2025-01-31"

      • "o1"

      • "o1-2024-12-17"

      • "gpt-4o"

      • "gpt-4o-2024-11-20"

      • "gpt-4o-2024-08-06"

      • "gpt-4o-2024-05-13"

      • "gpt-4o-mini"

      • "gpt-4o-mini-2024-07-18"

      • "gpt-4.5-preview"

      • "gpt-4.5-preview-2025-02-27"

      • "gpt-4-turbo"

      • "gpt-4-turbo-2024-04-09"

      • "gpt-4-0125-preview"

      • "gpt-4-turbo-preview"

      • "gpt-4-1106-preview"

      • "gpt-4-vision-preview"

      • "gpt-4"

      • "gpt-4-0314"

      • "gpt-4-0613"

      • "gpt-4-32k"

      • "gpt-4-32k-0314"

      • "gpt-4-32k-0613"

      • "gpt-3.5-turbo"

      • "gpt-3.5-turbo-16k"

      • "gpt-3.5-turbo-0613"

      • "gpt-3.5-turbo-1106"

      • "gpt-3.5-turbo-0125"

      • "gpt-3.5-turbo-16k-0613"

  • parallel_tool_calls: optional boolean

    Whether to enable parallel function calling during tool use.

  • reasoning_effort: optional ReasoningEffort

    Constrains effort on reasoning for reasoning models. Currently supported values are none, minimal, low, medium, high, and xhigh. Reducing reasoning effort can result in faster responses and fewer tokens used on reasoning in a response.

    • gpt-5.1 defaults to none, which does not perform reasoning. The supported reasoning values for gpt-5.1 are none, low, medium, and high. Tool calls are supported for all reasoning values in gpt-5.1.

    • All models before gpt-5.1 default to medium reasoning effort, and do not support none.

    • The gpt-5-pro model defaults to (and only supports) high reasoning effort.

    • xhigh is supported for all models after gpt-5.1-codex-max.

    • "none"

    • "minimal"

    • "low"

    • "medium"

    • "high"

    • "xhigh"

  • response_format: optional AssistantResponseFormatOption

    Specifies the format that the model must output. Compatible with GPT-4o, GPT-4 Turbo, and all GPT-3.5 Turbo models since gpt-3.5-turbo-1106.

    Setting to { "type": "json_schema", "json_schema": {...} } enables Structured Outputs which ensures the model will match your supplied JSON schema. Learn more in the Structured Outputs guide.

    Setting to { "type": "json_object" } enables JSON mode, which ensures the message the model generates is valid JSON.

    Important: when using JSON mode, you must also instruct the model to produce JSON yourself via a system or user message. Without this, the model may generate an unending stream of whitespace until the generation reaches the token limit, resulting in a long-running and seemingly "stuck" request. Also note that the message content may be partially cut off if finish_reason="length", which indicates the generation exceeded max_tokens or the conversation exceeded the max context length.

    • "auto"

      auto is the default value

      • "auto"

    • ResponseFormatText object { type }

      Default response format. Used to generate text responses.

      • type: "text"

        The type of response format being defined. Always text.

        • "text"

    • ResponseFormatJSONObject object { type }

      JSON object response format. An older method of generating JSON responses. Using json_schema is recommended for models that support it. Note that the model will not generate JSON without a system or user message instructing it to do so.

      • type: "json_object"

        The type of response format being defined. Always json_object.

        • "json_object"

    • ResponseFormatJSONSchema object { json_schema, type }

      JSON Schema response format. Used to generate structured JSON responses. Learn more about Structured Outputs.

      • json_schema: object { name, description, schema, strict }

        Structured Outputs configuration options, including a JSON Schema.

        • name: string

          The name of the response format. Must be a-z, A-Z, 0-9, or contain underscores and dashes, with a maximum length of 64.

        • description: optional string

          A description of what the response format is for, used by the model to determine how to respond in the format.

        • schema: optional map[unknown]

          The schema for the response format, described as a JSON Schema object. Learn how to build JSON schemas here.

        • strict: optional boolean

          Whether to enable strict schema adherence when generating the output. If set to true, the model will always follow the exact schema defined in the schema field. Only a subset of JSON Schema is supported when strict is true. To learn more, read the Structured Outputs guide.

      • type: "json_schema"

        The type of response format being defined. Always json_schema.

        • "json_schema"

  • stream: optional boolean

    If true, returns a stream of events that happen during the Run as server-sent events, terminating when the Run enters a terminal state with a data: [DONE] message.

  • temperature: optional number

    What sampling temperature to use, between 0 and 2. Higher values like 0.8 will make the output more random, while lower values like 0.2 will make it more focused and deterministic.

  • tool_choice: optional AssistantToolChoiceOption

    Controls which (if any) tool is called by the model. none means the model will not call any tools and instead generates a message. auto is the default value and means the model can pick between generating a message or calling one or more tools. required means the model must call one or more tools before responding to the user. Specifying a particular tool like {"type": "file_search"} or {"type": "function", "function": {"name": "my_function"}} forces the model to call that tool.

    • "none" or "auto" or "required"

      none means the model will not call any tools and instead generates a message. auto means the model can pick between generating a message or calling one or more tools. required means the model must call one or more tools before responding to the user.

      • "none"

      • "auto"

      • "required"

    • AssistantToolChoice object { type, function }

      Specifies a tool the model should use. Use to force the model to call a specific tool.

      • type: "function" or "code_interpreter" or "file_search"

        The type of the tool. If type is function, the function name must be set

        • "function"

        • "code_interpreter"

        • "file_search"

      • function: optional AssistantToolChoiceFunction

        • name: string

          The name of the function to call.

  • tools: optional array of CodeInterpreterTool or FileSearchTool or FunctionTool

    Override the tools the assistant can use for this run. This is useful for modifying the behavior on a per-run basis.

    • CodeInterpreterTool object { type }

    • FileSearchTool object { type, file_search }

      • type: "file_search"

        The type of tool being defined: file_search

        • "file_search"

      • file_search: optional object { max_num_results, ranking_options }

        Overrides for the file search tool.

        • max_num_results: optional number

          The maximum number of results the file search tool should output. The default is 20 for gpt-4* models and 5 for gpt-3.5-turbo. This number should be between 1 and 50 inclusive.

          Note that the file search tool may output fewer than max_num_results results. See the file search tool documentation for more information.

        • ranking_options: optional object { score_threshold, ranker }

          The ranking options for the file search. If not specified, the file search tool will use the auto ranker and a score_threshold of 0.

          See the file search tool documentation for more information.

          • score_threshold: number

            The score threshold for the file search. All values must be a floating point number between 0 and 1.

          • ranker: optional "auto" or "default_2024_08_21"

            The ranker to use for the file search. If not specified will use the auto ranker.

            • "auto"

            • "default_2024_08_21"

    • FunctionTool object { function, type }

      • function: FunctionDefinition

        • name: string

          The name of the function to be called. Must be a-z, A-Z, 0-9, or contain underscores and dashes, with a maximum length of 64.

        • description: optional string

          A description of what the function does, used by the model to choose when and how to call the function.

        • parameters: optional FunctionParameters

          The parameters the functions accepts, described as a JSON Schema object. See the guide for examples, and the JSON Schema reference for documentation about the format.

          Omitting parameters defines a function with an empty parameter list.

        • strict: optional boolean

          Whether to enable strict schema adherence when generating the function call. If set to true, the model will follow the exact schema defined in the parameters field. Only a subset of JSON Schema is supported when strict is true. Learn more about Structured Outputs in the function calling guide.

      • type: "function"

        The type of tool being defined: function

        • "function"

  • top_p: optional number

    An alternative to sampling with temperature, called nucleus sampling, where the model considers the results of the tokens with top_p probability mass. So 0.1 means only the tokens comprising the top 10% probability mass are considered.

    We generally recommend altering this or temperature but not both.

  • truncation_strategy: optional object { type, last_messages }

    Controls for how a thread will be truncated prior to the run. Use this to control the initial context window of the run.

    • type: "auto" or "last_messages"

      The truncation strategy to use for the thread. The default is auto. If set to last_messages, the thread will be truncated to the n most recent messages in the thread. When set to auto, messages in the middle of the thread will be dropped to fit the context length of the model, max_prompt_tokens.

      • "auto"

      • "last_messages"

    • last_messages: optional number

      The number of most recent messages from the thread when constructing the context for the run.

Returns

  • Run object { id, assistant_id, cancelled_at, 24 more }

    Represents an execution run on a thread.

    • id: string

      The identifier, which can be referenced in API endpoints.

    • assistant_id: string

      The ID of the assistant used for execution of this run.

    • cancelled_at: number

      The Unix timestamp (in seconds) for when the run was cancelled.

    • completed_at: number

      The Unix timestamp (in seconds) for when the run was completed.

    • created_at: number

      The Unix timestamp (in seconds) for when the run was created.

    • expires_at: number

      The Unix timestamp (in seconds) for when the run will expire.

    • failed_at: number

      The Unix timestamp (in seconds) for when the run failed.

    • incomplete_details: object { reason }

      Details on why the run is incomplete. Will be null if the run is not incomplete.

      • reason: optional "max_completion_tokens" or "max_prompt_tokens"

        The reason why the run is incomplete. This will point to which specific token limit was reached over the course of the run.

        • "max_completion_tokens"

        • "max_prompt_tokens"

    • instructions: string

      The instructions that the assistant used for this run.

    • last_error: object { code, message }

      The last error associated with this run. Will be null if there are no errors.

      • code: "server_error" or "rate_limit_exceeded" or "invalid_prompt"

        One of server_error, rate_limit_exceeded, or invalid_prompt.

        • "server_error"

        • "rate_limit_exceeded"

        • "invalid_prompt"

      • message: string

        A human-readable description of the error.

    • max_completion_tokens: number

      The maximum number of completion tokens specified to have been used over the course of the run.

    • max_prompt_tokens: number

      The maximum number of prompt tokens specified to have been used over the course of the run.

    • metadata: Metadata

      Set of 16 key-value pairs that can be attached to an object. This can be useful for storing additional information about the object in a structured format, and querying for objects via API or the dashboard.

      Keys are strings with a maximum length of 64 characters. Values are strings with a maximum length of 512 characters.

    • model: string

      The model that the assistant used for this run.

    • object: "thread.run"

      The object type, which is always thread.run.

      • "thread.run"

    • parallel_tool_calls: boolean

      Whether to enable parallel function calling during tool use.

    • required_action: object { submit_tool_outputs, type }

      Details on the action required to continue the run. Will be null if no action is required.

      • submit_tool_outputs: object { tool_calls }

        Details on the tool outputs needed for this run to continue.

        • tool_calls: array of RequiredActionFunctionToolCall

          A list of the relevant tool calls.

          • id: string

            The ID of the tool call. This ID must be referenced when you submit the tool outputs in using the Submit tool outputs to run endpoint.

          • function: object { arguments, name }

            The function definition.

            • arguments: string

              The arguments that the model expects you to pass to the function.

            • name: string

              The name of the function.

          • type: "function"

            The type of tool call the output is required for. For now, this is always function.

            • "function"

      • type: "submit_tool_outputs"

        For now, this is always submit_tool_outputs.

        • "submit_tool_outputs"

    • response_format: AssistantResponseFormatOption

      Specifies the format that the model must output. Compatible with GPT-4o, GPT-4 Turbo, and all GPT-3.5 Turbo models since gpt-3.5-turbo-1106.

      Setting to { "type": "json_schema", "json_schema": {...} } enables Structured Outputs which ensures the model will match your supplied JSON schema. Learn more in the Structured Outputs guide.

      Setting to { "type": "json_object" } enables JSON mode, which ensures the message the model generates is valid JSON.

      Important: when using JSON mode, you must also instruct the model to produce JSON yourself via a system or user message. Without this, the model may generate an unending stream of whitespace until the generation reaches the token limit, resulting in a long-running and seemingly "stuck" request. Also note that the message content may be partially cut off if finish_reason="length", which indicates the generation exceeded max_tokens or the conversation exceeded the max context length.

      • "auto"

        auto is the default value

        • "auto"

      • ResponseFormatText object { type }

        Default response format. Used to generate text responses.

        • type: "text"

          The type of response format being defined. Always text.

          • "text"

      • ResponseFormatJSONObject object { type }

        JSON object response format. An older method of generating JSON responses. Using json_schema is recommended for models that support it. Note that the model will not generate JSON without a system or user message instructing it to do so.

        • type: "json_object"

          The type of response format being defined. Always json_object.

          • "json_object"

      • ResponseFormatJSONSchema object { json_schema, type }

        JSON Schema response format. Used to generate structured JSON responses. Learn more about Structured Outputs.

        • json_schema: object { name, description, schema, strict }

          Structured Outputs configuration options, including a JSON Schema.

          • name: string

            The name of the response format. Must be a-z, A-Z, 0-9, or contain underscores and dashes, with a maximum length of 64.

          • description: optional string

            A description of what the response format is for, used by the model to determine how to respond in the format.

          • schema: optional map[unknown]

            The schema for the response format, described as a JSON Schema object. Learn how to build JSON schemas here.

          • strict: optional boolean

            Whether to enable strict schema adherence when generating the output. If set to true, the model will always follow the exact schema defined in the schema field. Only a subset of JSON Schema is supported when strict is true. To learn more, read the Structured Outputs guide.

        • type: "json_schema"

          The type of response format being defined. Always json_schema.

          • "json_schema"

    • started_at: number

      The Unix timestamp (in seconds) for when the run was started.

    • status: "queued" or "in_progress" or "requires_action" or 6 more

      The status of the run, which can be either queued, in_progress, requires_action, cancelling, cancelled, failed, completed, incomplete, or expired.

      • "queued"

      • "in_progress"

      • "requires_action"

      • "cancelling"

      • "cancelled"

      • "failed"

      • "completed"

      • "incomplete"

      • "expired"

    • thread_id: string

      The ID of the thread that was executed on as a part of this run.

    • tool_choice: AssistantToolChoiceOption

      Controls which (if any) tool is called by the model. none means the model will not call any tools and instead generates a message. auto is the default value and means the model can pick between generating a message or calling one or more tools. required means the model must call one or more tools before responding to the user. Specifying a particular tool like {"type": "file_search"} or {"type": "function", "function": {"name": "my_function"}} forces the model to call that tool.

      • "none" or "auto" or "required"

        none means the model will not call any tools and instead generates a message. auto means the model can pick between generating a message or calling one or more tools. required means the model must call one or more tools before responding to the user.

        • "none"

        • "auto"

        • "required"

      • AssistantToolChoice object { type, function }

        Specifies a tool the model should use. Use to force the model to call a specific tool.

        • type: "function" or "code_interpreter" or "file_search"

          The type of the tool. If type is function, the function name must be set

          • "function"

          • "code_interpreter"

          • "file_search"

        • function: optional AssistantToolChoiceFunction

          • name: string

            The name of the function to call.

    • tools: array of CodeInterpreterTool or FileSearchTool or FunctionTool

      The list of tools that the assistant used for this run.

      • CodeInterpreterTool object { type }

        • type: "code_interpreter"

          The type of tool being defined: code_interpreter

          • "code_interpreter"

      • FileSearchTool object { type, file_search }

        • type: "file_search"

          The type of tool being defined: file_search

          • "file_search"

        • file_search: optional object { max_num_results, ranking_options }

          Overrides for the file search tool.

          • max_num_results: optional number

            The maximum number of results the file search tool should output. The default is 20 for gpt-4* models and 5 for gpt-3.5-turbo. This number should be between 1 and 50 inclusive.

            Note that the file search tool may output fewer than max_num_results results. See the file search tool documentation for more information.

          • ranking_options: optional object { score_threshold, ranker }

            The ranking options for the file search. If not specified, the file search tool will use the auto ranker and a score_threshold of 0.

            See the file search tool documentation for more information.

            • score_threshold: number

              The score threshold for the file search. All values must be a floating point number between 0 and 1.

            • ranker: optional "auto" or "default_2024_08_21"

              The ranker to use for the file search. If not specified will use the auto ranker.

              • "auto"

              • "default_2024_08_21"

      • FunctionTool object { function, type }

        • function: FunctionDefinition

          • name: string

            The name of the function to be called. Must be a-z, A-Z, 0-9, or contain underscores and dashes, with a maximum length of 64.

          • description: optional string

            A description of what the function does, used by the model to choose when and how to call the function.

          • parameters: optional FunctionParameters

            The parameters the functions accepts, described as a JSON Schema object. See the guide for examples, and the JSON Schema reference for documentation about the format.

            Omitting parameters defines a function with an empty parameter list.

          • strict: optional boolean

            Whether to enable strict schema adherence when generating the function call. If set to true, the model will follow the exact schema defined in the parameters field. Only a subset of JSON Schema is supported when strict is true. Learn more about Structured Outputs in the function calling guide.

        • type: "function"

          The type of tool being defined: function

          • "function"

    • truncation_strategy: object { type, last_messages }

      Controls for how a thread will be truncated prior to the run. Use this to control the initial context window of the run.

      • type: "auto" or "last_messages"

        The truncation strategy to use for the thread. The default is auto. If set to last_messages, the thread will be truncated to the n most recent messages in the thread. When set to auto, messages in the middle of the thread will be dropped to fit the context length of the model, max_prompt_tokens.

        • "auto"

        • "last_messages"

      • last_messages: optional number

        The number of most recent messages from the thread when constructing the context for the run.

    • usage: object { completion_tokens, prompt_tokens, total_tokens }

      Usage statistics related to the run. This value will be null if the run is not in a terminal state (i.e. in_progress, queued, etc.).

      • completion_tokens: number

        Number of completion tokens used over the course of the run.

      • prompt_tokens: number

        Number of prompt tokens used over the course of the run.

      • total_tokens: number

        Total number of tokens used (prompt + completion).

    • temperature: optional number

      The sampling temperature used for this run. If not set, defaults to 1.

    • top_p: optional number

      The nucleus sampling value used for this run. If not set, defaults to 1.

Example

curl https://api.openai.com/v1/threads/$THREAD_ID/runs \
    -H 'Content-Type: application/json' \
    -H 'OpenAI-Beta: assistants=v2' \
    -H "Authorization: Bearer $OPENAI_API_KEY" \
    -d '{
          "assistant_id": "assistant_id",
          "temperature": 1,
          "top_p": 1
        }'

Response

{
  "id": "id",
  "assistant_id": "assistant_id",
  "cancelled_at": 0,
  "completed_at": 0,
  "created_at": 0,
  "expires_at": 0,
  "failed_at": 0,
  "incomplete_details": {
    "reason": "max_completion_tokens"
  },
  "instructions": "instructions",
  "last_error": {
    "code": "server_error",
    "message": "message"
  },
  "max_completion_tokens": 256,
  "max_prompt_tokens": 256,
  "metadata": {
    "foo": "string"
  },
  "model": "model",
  "object": "thread.run",
  "parallel_tool_calls": true,
  "required_action": {
    "submit_tool_outputs": {
      "tool_calls": [
        {
          "id": "id",
          "function": {
            "arguments": "arguments",
            "name": "name"
          },
          "type": "function"
        }
      ]
    },
    "type": "submit_tool_outputs"
  },
  "response_format": "auto",
  "started_at": 0,
  "status": "queued",
  "thread_id": "thread_id",
  "tool_choice": "none",
  "tools": [
    {
      "type": "code_interpreter"
    }
  ],
  "truncation_strategy": {
    "type": "auto",
    "last_messages": 1
  },
  "usage": {
    "completion_tokens": 0,
    "prompt_tokens": 0,
    "total_tokens": 0
  },
  "temperature": 0,
  "top_p": 0
}

Example

curl https://api.openai.com/v1/threads/thread_abc123/runs \
  -H "Authorization: Bearer $OPENAI_API_KEY" \
  -H "Content-Type: application/json" \
  -H "OpenAI-Beta: assistants=v2" \
  -d '{
    "assistant_id": "asst_abc123"
  }'

Response

{
  "id": "run_abc123",
  "object": "thread.run",
  "created_at": 1699063290,
  "assistant_id": "asst_abc123",
  "thread_id": "thread_abc123",
  "status": "queued",
  "started_at": 1699063290,
  "expires_at": null,
  "cancelled_at": null,
  "failed_at": null,
  "completed_at": 1699063291,
  "last_error": null,
  "model": "gpt-4o",
  "instructions": null,
  "incomplete_details": null,
  "tools": [
    {
      "type": "code_interpreter"
    }
  ],
  "metadata": {},
  "usage": null,
  "temperature": 1.0,
  "top_p": 1.0,
  "max_prompt_tokens": 1000,
  "max_completion_tokens": 1000,
  "truncation_strategy": {
    "type": "auto",
    "last_messages": null
  },
  "response_format": "auto",
  "tool_choice": "auto",
  "parallel_tool_calls": true
}

Streaming

curl https://api.openai.com/v1/threads/thread_123/runs \
  -H "Authorization: Bearer $OPENAI_API_KEY" \
  -H "Content-Type: application/json" \
  -H "OpenAI-Beta: assistants=v2" \
  -d '{
    "assistant_id": "asst_123",
    "stream": true
  }'

Response

event: thread.run.created
data: {"id":"run_123","object":"thread.run","created_at":1710330640,"assistant_id":"asst_123","thread_id":"thread_123","status":"queued","started_at":null,"expires_at":1710331240,"cancelled_at":null,"failed_at":null,"completed_at":null,"required_action":null,"last_error":null,"model":"gpt-4o","instructions":null,"tools":[],"metadata":{},"temperature":1.0,"top_p":1.0,"max_completion_tokens":null,"max_prompt_tokens":null,"truncation_strategy":{"type":"auto","last_messages":null},"incomplete_details":null,"usage":null,"response_format":"auto","tool_choice":"auto","parallel_tool_calls":true}}

event: thread.run.queued
data: {"id":"run_123","object":"thread.run","created_at":1710330640,"assistant_id":"asst_123","thread_id":"thread_123","status":"queued","started_at":null,"expires_at":1710331240,"cancelled_at":null,"failed_at":null,"completed_at":null,"required_action":null,"last_error":null,"model":"gpt-4o","instructions":null,"tools":[],"metadata":{},"temperature":1.0,"top_p":1.0,"max_completion_tokens":null,"max_prompt_tokens":null,"truncation_strategy":{"type":"auto","last_messages":null},"incomplete_details":null,"usage":null,"response_format":"auto","tool_choice":"auto","parallel_tool_calls":true}}

event: thread.run.in_progress
data: {"id":"run_123","object":"thread.run","created_at":1710330640,"assistant_id":"asst_123","thread_id":"thread_123","status":"in_progress","started_at":1710330641,"expires_at":1710331240,"cancelled_at":null,"failed_at":null,"completed_at":null,"required_action":null,"last_error":null,"model":"gpt-4o","instructions":null,"tools":[],"metadata":{},"temperature":1.0,"top_p":1.0,"max_completion_tokens":null,"max_prompt_tokens":null,"truncation_strategy":{"type":"auto","last_messages":null},"incomplete_details":null,"usage":null,"response_format":"auto","tool_choice":"auto","parallel_tool_calls":true}}

event: thread.run.step.created
data: {"id":"step_001","object":"thread.run.step","created_at":1710330641,"run_id":"run_123","assistant_id":"asst_123","thread_id":"thread_123","type":"message_creation","status":"in_progress","cancelled_at":null,"completed_at":null,"expires_at":1710331240,"failed_at":null,"last_error":null,"step_details":{"type":"message_creation","message_creation":{"message_id":"msg_001"}},"usage":null}

event: thread.run.step.in_progress
data: {"id":"step_001","object":"thread.run.step","created_at":1710330641,"run_id":"run_123","assistant_id":"asst_123","thread_id":"thread_123","type":"message_creation","status":"in_progress","cancelled_at":null,"completed_at":null,"expires_at":1710331240,"failed_at":null,"last_error":null,"step_details":{"type":"message_creation","message_creation":{"message_id":"msg_001"}},"usage":null}

event: thread.message.created
data: {"id":"msg_001","object":"thread.message","created_at":1710330641,"assistant_id":"asst_123","thread_id":"thread_123","run_id":"run_123","status":"in_progress","incomplete_details":null,"incomplete_at":null,"completed_at":null,"role":"assistant","content":[],"metadata":{}}

event: thread.message.in_progress
data: {"id":"msg_001","object":"thread.message","created_at":1710330641,"assistant_id":"asst_123","thread_id":"thread_123","run_id":"run_123","status":"in_progress","incomplete_details":null,"incomplete_at":null,"completed_at":null,"role":"assistant","content":[],"metadata":{}}

event: thread.message.delta
data: {"id":"msg_001","object":"thread.message.delta","delta":{"content":[{"index":0,"type":"text","text":{"value":"Hello","annotations":[]}}]}}

...

event: thread.message.delta
data: {"id":"msg_001","object":"thread.message.delta","delta":{"content":[{"index":0,"type":"text","text":{"value":" today"}}]}}

event: thread.message.delta
data: {"id":"msg_001","object":"thread.message.delta","delta":{"content":[{"index":0,"type":"text","text":{"value":"?"}}]}}

event: thread.message.completed
data: {"id":"msg_001","object":"thread.message","created_at":1710330641,"assistant_id":"asst_123","thread_id":"thread_123","run_id":"run_123","status":"completed","incomplete_details":null,"incomplete_at":null,"completed_at":1710330642,"role":"assistant","content":[{"type":"text","text":{"value":"Hello! How can I assist you today?","annotations":[]}}],"metadata":{}}

event: thread.run.step.completed
data: {"id":"step_001","object":"thread.run.step","created_at":1710330641,"run_id":"run_123","assistant_id":"asst_123","thread_id":"thread_123","type":"message_creation","status":"completed","cancelled_at":null,"completed_at":1710330642,"expires_at":1710331240,"failed_at":null,"last_error":null,"step_details":{"type":"message_creation","message_creation":{"message_id":"msg_001"}},"usage":{"prompt_tokens":20,"completion_tokens":11,"total_tokens":31}}

event: thread.run.completed
data: {"id":"run_123","object":"thread.run","created_at":1710330640,"assistant_id":"asst_123","thread_id":"thread_123","status":"completed","started_at":1710330641,"expires_at":null,"cancelled_at":null,"failed_at":null,"completed_at":1710330642,"required_action":null,"last_error":null,"model":"gpt-4o","instructions":null,"tools":[],"metadata":{},"temperature":1.0,"top_p":1.0,"max_completion_tokens":null,"max_prompt_tokens":null,"truncation_strategy":{"type":"auto","last_messages":null},"incomplete_details":null,"usage":{"prompt_tokens":20,"completion_tokens":11,"total_tokens":31},"response_format":"auto","tool_choice":"auto","parallel_tool_calls":true}}

event: done
data: [DONE]

Streaming with Functions

curl https://api.openai.com/v1/threads/thread_abc123/runs \
  -H "Authorization: Bearer $OPENAI_API_KEY" \
  -H "Content-Type: application/json" \
  -H "OpenAI-Beta: assistants=v2" \
  -d '{
    "assistant_id": "asst_abc123",
    "tools": [
      {
        "type": "function",
        "function": {
          "name": "get_current_weather",
          "description": "Get the current weather in a given location",
          "parameters": {
            "type": "object",
            "properties": {
              "location": {
                "type": "string",
                "description": "The city and state, e.g. San Francisco, CA"
              },
              "unit": {
                "type": "string",
                "enum": ["celsius", "fahrenheit"]
              }
            },
            "required": ["location"]
          }
        }
      }
    ],
    "stream": true
  }'

Response

event: thread.run.created
data: {"id":"run_123","object":"thread.run","created_at":1710348075,"assistant_id":"asst_123","thread_id":"thread_123","status":"queued","started_at":null,"expires_at":1710348675,"cancelled_at":null,"failed_at":null,"completed_at":null,"required_action":null,"last_error":null,"model":"gpt-4o","instructions":null,"tools":[],"metadata":{},"temperature":1.0,"top_p":1.0,"max_completion_tokens":null,"max_prompt_tokens":null,"truncation_strategy":{"type":"auto","last_messages":null},"incomplete_details":null,"usage":null,"response_format":"auto","tool_choice":"auto","parallel_tool_calls":true}}

event: thread.run.queued
data: {"id":"run_123","object":"thread.run","created_at":1710348075,"assistant_id":"asst_123","thread_id":"thread_123","status":"queued","started_at":null,"expires_at":1710348675,"cancelled_at":null,"failed_at":null,"completed_at":null,"required_action":null,"last_error":null,"model":"gpt-4o","instructions":null,"tools":[],"metadata":{},"temperature":1.0,"top_p":1.0,"max_completion_tokens":null,"max_prompt_tokens":null,"truncation_strategy":{"type":"auto","last_messages":null},"incomplete_details":null,"usage":null,"response_format":"auto","tool_choice":"auto","parallel_tool_calls":true}}

event: thread.run.in_progress
data: {"id":"run_123","object":"thread.run","created_at":1710348075,"assistant_id":"asst_123","thread_id":"thread_123","status":"in_progress","started_at":1710348075,"expires_at":1710348675,"cancelled_at":null,"failed_at":null,"completed_at":null,"required_action":null,"last_error":null,"model":"gpt-4o","instructions":null,"tools":[],"metadata":{},"temperature":1.0,"top_p":1.0,"max_completion_tokens":null,"max_prompt_tokens":null,"truncation_strategy":{"type":"auto","last_messages":null},"incomplete_details":null,"usage":null,"response_format":"auto","tool_choice":"auto","parallel_tool_calls":true}}

event: thread.run.step.created
data: {"id":"step_001","object":"thread.run.step","created_at":1710348076,"run_id":"run_123","assistant_id":"asst_123","thread_id":"thread_123","type":"message_creation","status":"in_progress","cancelled_at":null,"completed_at":null,"expires_at":1710348675,"failed_at":null,"last_error":null,"step_details":{"type":"message_creation","message_creation":{"message_id":"msg_001"}},"usage":null}

event: thread.run.step.in_progress
data: {"id":"step_001","object":"thread.run.step","created_at":1710348076,"run_id":"run_123","assistant_id":"asst_123","thread_id":"thread_123","type":"message_creation","status":"in_progress","cancelled_at":null,"completed_at":null,"expires_at":1710348675,"failed_at":null,"last_error":null,"step_details":{"type":"message_creation","message_creation":{"message_id":"msg_001"}},"usage":null}

event: thread.message.created
data: {"id":"msg_001","object":"thread.message","created_at":1710348076,"assistant_id":"asst_123","thread_id":"thread_123","run_id":"run_123","status":"in_progress","incomplete_details":null,"incomplete_at":null,"completed_at":null,"role":"assistant","content":[],"metadata":{}}

event: thread.message.in_progress
data: {"id":"msg_001","object":"thread.message","created_at":1710348076,"assistant_id":"asst_123","thread_id":"thread_123","run_id":"run_123","status":"in_progress","incomplete_details":null,"incomplete_at":null,"completed_at":null,"role":"assistant","content":[],"metadata":{}}

event: thread.message.delta
data: {"id":"msg_001","object":"thread.message.delta","delta":{"content":[{"index":0,"type":"text","text":{"value":"Hello","annotations":[]}}]}}

...

event: thread.message.delta
data: {"id":"msg_001","object":"thread.message.delta","delta":{"content":[{"index":0,"type":"text","text":{"value":" today"}}]}}

event: thread.message.delta
data: {"id":"msg_001","object":"thread.message.delta","delta":{"content":[{"index":0,"type":"text","text":{"value":"?"}}]}}

event: thread.message.completed
data: {"id":"msg_001","object":"thread.message","created_at":1710348076,"assistant_id":"asst_123","thread_id":"thread_123","run_id":"run_123","status":"completed","incomplete_details":null,"incomplete_at":null,"completed_at":1710348077,"role":"assistant","content":[{"type":"text","text":{"value":"Hello! How can I assist you today?","annotations":[]}}],"metadata":{}}

event: thread.run.step.completed
data: {"id":"step_001","object":"thread.run.step","created_at":1710348076,"run_id":"run_123","assistant_id":"asst_123","thread_id":"thread_123","type":"message_creation","status":"completed","cancelled_at":null,"completed_at":1710348077,"expires_at":1710348675,"failed_at":null,"last_error":null,"step_details":{"type":"message_creation","message_creation":{"message_id":"msg_001"}},"usage":{"prompt_tokens":20,"completion_tokens":11,"total_tokens":31}}

event: thread.run.completed
data: {"id":"run_123","object":"thread.run","created_at":1710348075,"assistant_id":"asst_123","thread_id":"thread_123","status":"completed","started_at":1710348075,"expires_at":null,"cancelled_at":null,"failed_at":null,"completed_at":1710348077,"required_action":null,"last_error":null,"model":"gpt-4o","instructions":null,"tools":[],"metadata":{},"temperature":1.0,"top_p":1.0,"max_completion_tokens":null,"max_prompt_tokens":null,"truncation_strategy":{"type":"auto","last_messages":null},"incomplete_details":null,"usage":{"prompt_tokens":20,"completion_tokens":11,"total_tokens":31},"response_format":"auto","tool_choice":"auto","parallel_tool_calls":true}}

event: done
data: [DONE]