fix: address review feedback — remove stale model names and fix test profile

- README: remove specific model names from Supported APIs and Model
  Availability sections (per mkozakov review — will go out of date)
- tests: default OCI_PROFILE to DEFAULT instead of API_KEY_AUTH

Author: fede-kamel

README.md

@@ -58,6 +58,111 @@ for event in response:
         print(event.delta.message.content.text, end="")
 ```
 
+## Oracle Cloud Infrastructure (OCI)
+
+The SDK supports Oracle Cloud Infrastructure (OCI) Generative AI service. First, install the OCI SDK:
+
+```
+pip install 'cohere[oci]'
+```
+
+Then use the `OciClient` or `OciClientV2`:
+
+```Python
+import cohere
+
+# Using OCI config file authentication (default: ~/.oci/config)
+co = cohere.OciClient(
+    oci_region="us-chicago-1",
+    oci_compartment_id="ocid1.compartment.oc1...",
+)
+
+response = co.embed(
+    model="embed-english-v3.0",
+    texts=["Hello world"],
+    input_type="search_document",
+)
+
+print(response.embeddings)
+```
+
+### OCI Authentication Methods
+
+**1. Config File (Default)**
+```Python
+co = cohere.OciClient(
+    oci_region="us-chicago-1",
+    oci_compartment_id="ocid1.compartment.oc1...",
+    # Uses ~/.oci/config with DEFAULT profile
+)
+```
+
+**2. Custom Profile**
+```Python
+co = cohere.OciClient(
+    oci_profile="MY_PROFILE",
+    oci_region="us-chicago-1",
+    oci_compartment_id="ocid1.compartment.oc1...",
+)
+```
+
+**3. Session-based Authentication (Security Token)**
+```Python
+# Works with OCI CLI session tokens
+co = cohere.OciClient(
+    oci_profile="MY_SESSION_PROFILE",  # Profile with security_token_file
+    oci_region="us-chicago-1",
+    oci_compartment_id="ocid1.compartment.oc1...",
+)
+```
+
+**4. Direct Credentials**
+```Python
+co = cohere.OciClient(
+    oci_user_id="ocid1.user.oc1...",
+    oci_fingerprint="xx:xx:xx:...",
+    oci_tenancy_id="ocid1.tenancy.oc1...",
+    oci_private_key_path="~/.oci/key.pem",
+    oci_region="us-chicago-1",
+    oci_compartment_id="ocid1.compartment.oc1...",
+)
+```
+
+**5. Instance Principal (for OCI Compute instances)**
+```Python
+co = cohere.OciClient(
+    auth_type="instance_principal",
+    oci_region="us-chicago-1",
+    oci_compartment_id="ocid1.compartment.oc1...",
+)
+```
+
+### Supported OCI APIs
+
+The OCI client supports the following Cohere APIs:
+- **Embed**: Full support for all embedding models
+- **Chat**: Full support with both V1 (`OciClient`) and V2 (`OciClientV2`) APIs
+  - Streaming available via `chat_stream()`
+  - Supports Command-R and Command-A model families
+
+### OCI Model Availability and Limitations
+
+**Available on OCI On-Demand Inference:**
+- ✅ **Embed models**: available on OCI Generative AI
+- ✅ **Chat models**: available via `OciClient` (V1) and `OciClientV2` (V2)
+
+**Not Available on OCI On-Demand Inference:**
+- ❌ **Generate API**: OCI TEXT_GENERATION models are base models that require fine-tuning before deployment
+- ❌ **Rerank API**: OCI TEXT_RERANK models are base models that require fine-tuning before deployment
+- ❌ **Multiple Embedding Types**: OCI on-demand models only support single embedding type per request (cannot request both `float` and `int8` simultaneously)
+
+**Note**: To use Generate or Rerank models on OCI, you need to:
+1. Fine-tune the base model using OCI's fine-tuning service
+2. Deploy the fine-tuned model to a dedicated endpoint
+3. Update your code to use the deployed model endpoint
+
+For the latest model availability, see the [OCI Generative AI documentation](https://docs.oracle.com/en-us/iaas/Content/generative-ai/home.htm).
+
 ## Contributing
 
 While we value open-source contributions to this SDK, the code is generated programmatically. Additions made directly would have to be moved over to our generation code, otherwise they would be overwritten upon the next generated release. Feel free to open a PR as a proof of concept, but know that we will not be able to merge it as-is. We suggest opening an issue first to discuss with us!