diff --git a/astrbot/core/provider/sources/openai_embedding_source.py b/astrbot/core/provider/sources/openai_embedding_source.py
index 2be0165bb3..126a41fdaf 100644
--- a/astrbot/core/provider/sources/openai_embedding_source.py
+++ b/astrbot/core/provider/sources/openai_embedding_source.py
@@ -1,3 +1,5 @@
+import re
+
 import httpx
 from openai import AsyncOpenAI
 
@@ -8,6 +10,13 @@
 from ..register import register_provider_adapter
 
 
+def _normalize_api_base(api_base: str) -> str:
+    api_base = api_base.strip().removesuffix("/").removesuffix("/embeddings")
+    if api_base and not re.search(r"/v\d+$", api_base):
+        api_base = api_base + "/v1"
+    return api_base
+
+
 @register_provider_adapter(
     "openai_embedding",
     "OpenAI API Embedding 提供商适配器",
@@ -24,15 +33,9 @@ def __init__(self, provider_config: dict, provider_settings: dict) -> None:
         if proxy:
             logger.info(f"[OpenAI Embedding] {provider_id} Using proxy: {proxy}")
             http_client = httpx.AsyncClient(proxy=proxy)
-        api_base = (
+        api_base = _normalize_api_base(
             provider_config.get("embedding_api_base", "https://api.openai.com/v1")
-            .strip()
-            .removesuffix("/")
-            .removesuffix("/embeddings")
         )
-        if api_base and not api_base.endswith("/v1") and not api_base.endswith("/v4"):
-            # /v4 see #5699
-            api_base = api_base + "/v1"
         logger.info(f"[OpenAI Embedding] {provider_id} Using API Base: {api_base}")
         self.client = AsyncOpenAI(
             api_key=provider_config.get("embedding_api_key"),
diff --git a/tests/test_openai_embedding_source.py b/tests/test_openai_embedding_source.py
new file mode 100644
index 0000000000..39a38d9455
--- /dev/null
+++ b/tests/test_openai_embedding_source.py
@@ -0,0 +1,18 @@
+from astrbot.core.provider.sources.openai_embedding_source import _normalize_api_base
+
+
+def test_openai_embedding_api_base_keeps_version_suffixes():
+    assert (
+        _normalize_api_base("https://ark.cn-beijing.volces.com/api/plan/v3")
+        == "https://ark.cn-beijing.volces.com/api/plan/v3"
+    )
+    assert _normalize_api_base("https://example.test/v4") == "https://example.test/v4"
+
+
+def test_openai_embedding_api_base_adds_default_version():
+    assert _normalize_api_base("https://example.test/openai") == (
+        "https://example.test/openai/v1"
+    )
+    assert _normalize_api_base("https://example.test/v1/embeddings") == (
+        "https://example.test/v1"
+    )