Add MiniMax as an OpenAI-compatible model provider (#1120)

* Add MiniMax as an OpenAI-compatible model provider

MiniMax offers high-performance LLMs (M2.5, M2.5-highspeed) with
204K context windows. This commit adds MiniMax as a selectable
provider in the configuration system.

Changes:
- Add MiniMax to SUPPORTED_MODELS with model definitions
- Add MiniMax provider configuration in conf/config.yaml
- Update documentation with MiniMax setup instructions

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Update README to remove MiniMax API details

Removed mention of MiniMax API usage and configuration examples.

---------

Co-authored-by: octo-patch <octo-patch@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: Willem Jiang <willem.jiang@gmail.com>

.env.example

@@ -16,6 +16,7 @@ INFOQUEST_API_KEY=your-infoquest-api-key
 # GEMINI_API_KEY=your-gemini-api-key
 # DEEPSEEK_API_KEY=your-deepseek-api-key
 # NOVITA_API_KEY=your-novita-api-key  # OpenAI-compatible, see https://novita.ai
+# MINIMAX_API_KEY=your-minimax-api-key  # OpenAI-compatible, see https://platform.minimax.io
 # FEISHU_APP_ID=your-feishu-app-id
 # FEISHU_APP_SECRET=your-feishu-app-secret
 

backend/docs/CONFIGURATION.md

@@ -41,6 +41,25 @@ models:
         thinking:
           type: enabled
 
+  - name: minimax-m2.5
+    display_name: MiniMax M2.5
+    use: langchain_openai:ChatOpenAI
+    model: MiniMax-M2.5
+    api_key: $MINIMAX_API_KEY
+    base_url: https://api.minimax.io/v1
+    max_tokens: 4096
+    temperature: 1.0  # MiniMax requires temperature in (0.0, 1.0]
+    supports_vision: true
+
+  - name: minimax-m2.5-highspeed
+    display_name: MiniMax M2.5 Highspeed
+    use: langchain_openai:ChatOpenAI
+    model: MiniMax-M2.5-highspeed
+    api_key: $MINIMAX_API_KEY
+    base_url: https://api.minimax.io/v1
+    max_tokens: 4096
+    temperature: 1.0  # MiniMax requires temperature in (0.0, 1.0]
+    supports_vision: true
   - name: openrouter-gemini-2.5-flash
     display_name: Gemini 2.5 Flash (OpenRouter)
     use: langchain_openai:ChatOpenAI

backend/tests/test_model_factory.py

@@ -410,3 +410,91 @@ def test_thinking_shortcut_not_leaked_into_model_when_disabled(monkeypatch):
 
     # The disable path should have set thinking to disabled (not the raw enabled shortcut)
     assert captured.get("thinking") == {"type": "disabled"}
+
+
+# ---------------------------------------------------------------------------
+# OpenAI-compatible providers (MiniMax, Novita, etc.)
+# ---------------------------------------------------------------------------
+
+
+def test_openai_compatible_provider_passes_base_url(monkeypatch):
+    """OpenAI-compatible providers like MiniMax should pass base_url through to the model."""
+    model = ModelConfig(
+        name="minimax-m2.5",
+        display_name="MiniMax M2.5",
+        description=None,
+        use="langchain_openai:ChatOpenAI",
+        model="MiniMax-M2.5",
+        base_url="https://api.minimax.io/v1",
+        api_key="test-key",
+        max_tokens=4096,
+        temperature=1.0,
+        supports_vision=True,
+        supports_thinking=False,
+    )
+    cfg = _make_app_config([model])
+    _patch_factory(monkeypatch, cfg)
+
+    captured: dict = {}
+
+    class CapturingModel(FakeChatModel):
+        def __init__(self, **kwargs):
+            captured.update(kwargs)
+            BaseChatModel.__init__(self, **kwargs)
+
+    monkeypatch.setattr(factory_module, "resolve_class", lambda path, base: CapturingModel)
+
+    factory_module.create_chat_model(name="minimax-m2.5")
+
+    assert captured.get("model") == "MiniMax-M2.5"
+    assert captured.get("base_url") == "https://api.minimax.io/v1"
+    assert captured.get("api_key") == "test-key"
+    assert captured.get("temperature") == 1.0
+    assert captured.get("max_tokens") == 4096
+
+
+def test_openai_compatible_provider_multiple_models(monkeypatch):
+    """Multiple models from the same OpenAI-compatible provider should coexist."""
+    m1 = ModelConfig(
+        name="minimax-m2.5",
+        display_name="MiniMax M2.5",
+        description=None,
+        use="langchain_openai:ChatOpenAI",
+        model="MiniMax-M2.5",
+        base_url="https://api.minimax.io/v1",
+        api_key="test-key",
+        temperature=1.0,
+        supports_vision=True,
+        supports_thinking=False,
+    )
+    m2 = ModelConfig(
+        name="minimax-m2.5-highspeed",
+        display_name="MiniMax M2.5 Highspeed",
+        description=None,
+        use="langchain_openai:ChatOpenAI",
+        model="MiniMax-M2.5-highspeed",
+        base_url="https://api.minimax.io/v1",
+        api_key="test-key",
+        temperature=1.0,
+        supports_vision=True,
+        supports_thinking=False,
+    )
+    cfg = _make_app_config([m1, m2])
+    _patch_factory(monkeypatch, cfg)
+
+    captured: dict = {}
+
+    class CapturingModel(FakeChatModel):
+        def __init__(self, **kwargs):
+            captured.update(kwargs)
+            BaseChatModel.__init__(self, **kwargs)
+
+    monkeypatch.setattr(factory_module, "resolve_class", lambda path, base: CapturingModel)
+
+    # Create first model
+    factory_module.create_chat_model(name="minimax-m2.5")
+    assert captured.get("model") == "MiniMax-M2.5"
+
+    # Create second model
+    factory_module.create_chat_model(name="minimax-m2.5-highspeed")
+    assert captured.get("model") == "MiniMax-M2.5-highspeed"

config.example.yaml

@@ -106,6 +106,29 @@ models:
   #       thinking:
   #         type: enabled
 
+  # Example: MiniMax (OpenAI-compatible)
+  # MiniMax provides high-performance models with 204K context window
+  # Docs: https://platform.minimax.io/docs/api-reference/text-openai-api
+  # - name: minimax-m2.5
+  #   display_name: MiniMax M2.5
+  #   use: langchain_openai:ChatOpenAI
+  #   model: MiniMax-M2.5
+  #   api_key: $MINIMAX_API_KEY
+  #   base_url: https://api.minimax.io/v1
+  #   max_tokens: 4096
+  #   temperature: 1.0  # MiniMax requires temperature in (0.0, 1.0]
+  #   supports_vision: true
+
+  # - name: minimax-m2.5-highspeed
+  #   display_name: MiniMax M2.5 Highspeed
+  #   use: langchain_openai:ChatOpenAI
+  #   model: MiniMax-M2.5-highspeed
+  #   api_key: $MINIMAX_API_KEY
+  #   base_url: https://api.minimax.io/v1
+  #   max_tokens: 4096
+  #   temperature: 1.0  # MiniMax requires temperature in (0.0, 1.0]
+  #   supports_vision: true
+  
   # Example: OpenRouter (OpenAI-compatible)
   # OpenRouter models use the same ChatOpenAI + base_url pattern as other OpenAI-compatible gateways.
   # - name: openrouter-gemini-2.5-flash