feat: add TrustedRouter as a JSON-configured OpenAI-compatible provider

TrustedRouter (https://trustedrouter.com) is an OpenAI-compatible LLM router.
Added via the JSON provider registry, following the parasail/libertai pattern:
providers.json entry, openai_compatible_providers/endpoints lists, LlmProviders
enum, and unit tests covering the registry, constants, env-var config, and
prefix routing

litellm/constants.py

@@ -788,6 +788,7 @@ openai_compatible_endpoints: Final[list] = [
     "https://api.inference.wandb.ai/v1",
     "https://api.clarifai.com/v2/ext/openai/v1",
     "https://api.libertai.io/v1",
+    "https://api.trustedrouter.com/v1",
     "https://pinstripes.io/v1",
     "https://api.meta.ai/v1",
     "https://api.cognition.ai/v1",
@@ -837,6 +838,7 @@ openai_compatible_providers: Final[list] = [
     "chutes",  # Chutes - JSON-configured provider
     "parasail",  # Parasail - JSON-configured provider
     "libertai",  # LibertAI - JSON-configured provider
+    "trustedrouter",  # TrustedRouter - JSON-configured provider
     "featherless_ai",
     "nscale",
     "nebius",

litellm/llms/openai_like/providers.json

@@ -200,5 +200,11 @@
       "temperature_max": 1.99
     },
     "supported_endpoints": ["/v1/chat/completions"]
+  },
+  "trustedrouter": {
+    "base_url": "https://api.trustedrouter.com/v1",
+    "api_key_env": "TRUSTEDROUTER_API_KEY",
+    "api_base_env": "TRUSTEDROUTER_API_BASE",
+    "supported_endpoints": ["/v1/chat/completions", "/v1/responses"]
   }
 }

litellm/types/utils.py

@@ -3831,6 +3831,7 @@ class LlmProviders(str, Enum):
     XIAOMI_MIMO = "xiaomi_mimo"
     TENSORMESH = "tensormesh"
     LIBERTAI = "libertai"
+    TRUSTEDROUTER = "trustedrouter"
     PINSTRIPES = "pinstripes"
     COGNITION = "cognition"
     SCX_AI = "scx-ai"

tests/test_litellm/llms/trustedrouter/test_trustedrouter.py

@@ -0,0 +1,59 @@
+import os
+from unittest.mock import patch
+
+TRUSTEDROUTER_API_BASE = "https://api.trustedrouter.com/v1"
+
+
+def test_trustedrouter_json_registry():
+    import litellm
+    from litellm.llms.openai_like.json_loader import JSONProviderRegistry
+
+    assert litellm.LlmProviders.TRUSTEDROUTER.value == "trustedrouter"
+    assert litellm.LlmProviders("trustedrouter") == litellm.LlmProviders.TRUSTEDROUTER
+    assert JSONProviderRegistry.exists("trustedrouter")
+    config = JSONProviderRegistry.get("trustedrouter")
+    assert config is not None
+    assert config.base_url == TRUSTEDROUTER_API_BASE
+    assert config.api_key_env == "TRUSTEDROUTER_API_KEY"
+    assert config.api_base_env == "TRUSTEDROUTER_API_BASE"
+    assert "/v1/chat/completions" in config.supported_endpoints
+    assert "/v1/responses" in config.supported_endpoints
+
+
+def test_trustedrouter_listed_in_openai_compatible_providers():
+    from litellm.constants import (
+        openai_compatible_endpoints,
+        openai_compatible_providers,
+    )
+
+    assert "trustedrouter" in openai_compatible_providers
+    assert TRUSTEDROUTER_API_BASE in openai_compatible_endpoints
+
+
+def test_trustedrouter_dynamic_config_env_vars():
+    from litellm.llms.openai_like.dynamic_config import create_config_class
+    from litellm.llms.openai_like.json_loader import JSONProviderRegistry
+
+    config = create_config_class(JSONProviderRegistry.get("trustedrouter"))()
+
+    with patch.dict(
+        os.environ,
+        {
+            "TRUSTEDROUTER_API_KEY": "test-key",
+            "TRUSTEDROUTER_API_BASE": "https://example.com/v1",
+        },
+    ):
+        api_base, api_key = config._get_openai_compatible_provider_info(None, None)
+
+    assert api_base == "https://example.com/v1"
+    assert api_key == "test-key"
+
+
+def test_trustedrouter_provider_detection_by_prefix():
+    from litellm.litellm_core_utils.get_llm_provider_logic import get_llm_provider
+
+    model, provider, _, api_base = get_llm_provider("trustedrouter/zdr")
+
+    assert model == "zdr"
+    assert provider == "trustedrouter"
+    assert api_base == TRUSTEDROUTER_API_BASE