feat: add Meta Model API provider and muse-spark-1.1 (day-0)

litellm/constants.py

@@ -715,6 +715,7 @@
     "https://api.clarifai.com/v2/ext/openai/v1",
     "https://api.libertai.io/v1",
     "https://pinstripes.io/v1",
+    "https://api.meta.ai/v1",
 ]
 
 
@@ -781,6 +782,7 @@
     "ragflow",
     "pinstripes",  # Pinstripes - JSON-configured provider
     "darkbloom",
+    "meta",  # Meta Model API (Muse Spark) - JSON-configured provider
 ]
 openai_text_completion_compatible_providers: List = [  # providers that support `/v1/completions`
     "together_ai",

litellm/litellm_core_utils/get_llm_provider_logic.py

@@ -346,6 +346,9 @@ def get_llm_provider(
                     elif endpoint == "https://pinstripes.io/v1":
                         custom_llm_provider = "pinstripes"
                         dynamic_api_key = get_secret_str("PINSTRIPES_API_KEY")
+                    elif endpoint == "https://api.meta.ai/v1":
+                        custom_llm_provider = "meta"
+                        dynamic_api_key = get_secret_str("META_API_KEY")
 
                     if api_base is not None and not isinstance(api_base, str):
                         raise Exception("api base needs to be a string. api_base={}".format(api_base))

litellm/llms/openai_like/dynamic_config.py

@@ -91,7 +91,7 @@ def get_complete_url(
         def get_supported_openai_params(self, model: str) -> list:
             """Get supported OpenAI params, excluding tool-related params for models
             that don't support function calling."""
-            from litellm.utils import supports_function_calling
+            from litellm.utils import supports_function_calling, supports_reasoning
 
             supported_params = super().get_supported_openai_params(model=model)
 
@@ -113,6 +113,10 @@ def get_supported_openai_params(self, model: str) -> list:
                     f"function calling — removed tool-related params from supported params."
                 )
 
+            _supports_reasoning = supports_reasoning(model=model, custom_llm_provider=provider.slug)
+            if _supports_reasoning and "reasoning_effort" not in supported_params:
+                supported_params.append("reasoning_effort")
+
             return supported_params
 
         def map_openai_params(

litellm/llms/openai_like/messages/transformation.py

@@ -1,8 +1,11 @@
 from typing import Any, Optional
 
+import litellm
 from litellm.llms.anthropic.experimental_pass_through.messages.transformation import (
     AnthropicMessagesConfig,
 )
+from litellm.llms.openai_like.json_loader import SimpleProviderConfig
+from litellm.secret_managers.main import get_secret_str
 
 DEFAULT_ANTHROPIC_API_VERSION = "2023-06-01"
 
@@ -67,3 +70,65 @@ def get_complete_url(
         if base.endswith("/v1"):
             base = base[: -len("/v1")]
         return f"{base}/v1/messages"
+
+
+class JSONProviderAnthropicMessagesConfig(OpenAILikeAnthropicMessagesConfig):
+    """
+    Provider-level native Anthropic Messages passthrough for JSON-configured
+    OpenAI-compatible providers whose ``supported_endpoints`` in providers.json
+    includes ``"/v1/messages"``. Resolves the api key and api base from the
+    provider's configured env vars, then forwards the Anthropic payload
+    untranslated like ``OpenAILikeAnthropicMessagesConfig``.
+    """
+
+    def __init__(self, provider: SimpleProviderConfig):
+        super().__init__()
+        self._provider = provider
+
+    def should_strip_billing_metadata(self) -> bool:
+        return True
+
+    def _resolve_api_key(self, api_key: Optional[str]) -> Optional[str]:
+        return api_key or get_secret_str(self._provider.api_key_env) or litellm.api_key
+
+    def _resolve_api_base(self, api_base: Optional[str]) -> str:
+        env_api_base = get_secret_str(self._provider.api_base_env) if self._provider.api_base_env else None
+        return api_base or env_api_base or self._provider.base_url
+
+    def validate_anthropic_messages_environment(
+        self,
+        headers: dict[str, str],
+        model: str,
+        messages: list[Any],
+        optional_params: dict,
+        litellm_params: dict,
+        api_key: Optional[str] = None,
+        api_base: Optional[str] = None,
+    ) -> tuple[dict[str, str], Optional[str]]:
+        return super().validate_anthropic_messages_environment(
+            headers=headers,
+            model=model,
+            messages=messages,
+            optional_params=optional_params,
+            litellm_params=litellm_params,
+            api_key=self._resolve_api_key(api_key),
+            api_base=api_base,
+        )
+
+    def get_complete_url(
+        self,
+        api_base: Optional[str],
+        api_key: Optional[str],
+        model: str,
+        optional_params: dict,
+        litellm_params: dict,
+        stream: Optional[bool] = None,
+    ) -> str:
+        return super().get_complete_url(
+            api_base=self._resolve_api_base(api_base),
+            api_key=api_key,
+            model=model,
+            optional_params=optional_params,
+            litellm_params=litellm_params,
+            stream=stream,
+        )

litellm/llms/openai_like/providers.json

@@ -168,6 +168,13 @@
     },
     "supported_endpoints": ["/v1/chat/completions", "/v1/responses"]
   },
+  "meta": {
+    "base_url": "https://api.meta.ai/v1",
+    "api_key_env": "META_API_KEY",
+    "api_base_env": "META_API_BASE",
+    "base_class": "openai_gpt",
+    "supported_endpoints": ["/v1/chat/completions", "/v1/responses", "/v1/messages"]
+  },
   "pinstripes": {
     "base_url": "https://pinstripes.io/v1",
     "api_key_env": "PINSTRIPES_API_KEY",

litellm/model_prices_and_context_window_backup.json

@@ -25501,6 +25501,42 @@
         "supports_function_calling": true,
         "supports_tool_choice": false
     },
+    "meta/muse-spark-1.1": {
+        "cache_read_input_token_cost": 1.5e-07,
+        "input_cost_per_token": 1.25e-06,
+        "litellm_provider": "meta",
+        "max_input_tokens": 1048576,
+        "max_output_tokens": 131072,
+        "max_tokens": 131072,
+        "mode": "chat",
+        "output_cost_per_token": 4.25e-06,
+        "source": "https://dev.meta.ai/docs/getting-started/pricing-rate-limits",
+        "supported_endpoints": [
+            "/v1/chat/completions",
+            "/v1/responses",
+            "/v1/messages"
+        ],
+        "supported_modalities": [
+            "text",
+            "image",
+            "video"
+        ],
+        "supported_output_modalities": [
+            "text"
+        ],
+        "supports_function_calling": true,
+        "supports_minimal_reasoning_effort": true,
+        "supports_parallel_function_calling": true,
+        "supports_pdf_input": true,
+        "supports_prompt_caching": true,
+        "supports_reasoning": true,
+        "supports_response_schema": true,
+        "supports_system_messages": true,
+        "supports_tool_choice": true,
+        "supports_vision": true,
+        "supports_web_search": true,
+        "supports_xhigh_reasoning_effort": true
+    },
     "meta_llama/Llama-3.3-70B-Instruct": {
         "litellm_provider": "meta_llama",
         "max_input_tokens": 128000,

litellm/types/utils.py

@@ -3397,6 +3397,7 @@ class LlmProviders(str, Enum):
     LIBERTAI = "libertai"
     PINSTRIPES = "pinstripes"
     DARKBLOOM = "darkbloom"
+    META = "meta"
     LITELLM_AGENT = "litellm_agent"
     CURSOR = "cursor"
     BEDROCK_MANTLE = "bedrock_mantle"

litellm/utils.py

@@ -8028,6 +8028,16 @@ def _get_provider_anthropic_messages_config_cached(
                 )
 
                 return GithubCopilotAnthropicMessagesConfig()
+
+        from litellm.llms.openai_like.json_loader import JSONProviderRegistry
+
+        json_provider = JSONProviderRegistry.get(provider.value)
+        if json_provider is not None and "/v1/messages" in json_provider.supported_endpoints:
+            from litellm.llms.openai_like.messages.transformation import (
+                JSONProviderAnthropicMessagesConfig,
+            )
+
+            return JSONProviderAnthropicMessagesConfig(json_provider)
         return None
 
     @staticmethod

model_prices_and_context_window.json

@@ -25659,6 +25659,42 @@
         "supports_function_calling": true,
         "supports_tool_choice": false
     },
+    "meta/muse-spark-1.1": {
+        "cache_read_input_token_cost": 1.5e-07,
+        "input_cost_per_token": 1.25e-06,
+        "litellm_provider": "meta",
+        "max_input_tokens": 1048576,
+        "max_output_tokens": 131072,
+        "max_tokens": 131072,
+        "mode": "chat",
+        "output_cost_per_token": 4.25e-06,
+        "source": "https://dev.meta.ai/docs/getting-started/pricing-rate-limits",
+        "supported_endpoints": [
+            "/v1/chat/completions",
+            "/v1/responses",
+            "/v1/messages"
+        ],
+        "supported_modalities": [
+            "text",
+            "image",
+            "video"
+        ],
+        "supported_output_modalities": [
+            "text"
+        ],
+        "supports_function_calling": true,
+        "supports_minimal_reasoning_effort": true,
+        "supports_parallel_function_calling": true,
+        "supports_pdf_input": true,
+        "supports_prompt_caching": true,
+        "supports_reasoning": true,
+        "supports_response_schema": true,
+        "supports_system_messages": true,
+        "supports_tool_choice": true,
+        "supports_vision": true,
+        "supports_web_search": true,
+        "supports_xhigh_reasoning_effort": true
+    },
     "meta_llama/Llama-3.3-70B-Instruct": {
         "litellm_provider": "meta_llama",
         "max_input_tokens": 128000,

provider_endpoints_support.json

@@ -1984,6 +1984,23 @@
         "interactions": true
       }
     },
+    "meta": {
+      "display_name": "Meta Model API (`meta`)",
+      "url": "https://docs.litellm.ai/docs/providers/meta",
+      "endpoints": {
+        "chat_completions": true,
+        "messages": true,
+        "responses": true,
+        "embeddings": false,
+        "image_generations": false,
+        "audio_transcriptions": false,
+        "audio_speech": false,
+        "moderations": false,
+        "batches": false,
+        "rerank": false,
+        "a2a": false
+      }
+    },
     "pinstripes": {
       "display_name": "Pinstripes (`pinstripes`)",
       "url": "https://docs.litellm.ai/docs/providers/pinstripes",