fix(utils.py): support fireworks ai finetuned models

Fixes https://github.com/BerriAI/litellm/issues/4923

litellm/tests/test_get_llm_provider.py

@@ -25,6 +25,15 @@ def test_get_llm_provider():
 # test_get_llm_provider()
 
 
+def test_get_llm_provider_fireworks():  # tests finetuned fireworks models - https://github.com/BerriAI/litellm/issues/4923
+    model, custom_llm_provider, _, _ = litellm.get_llm_provider(
+        model="fireworks_ai/accounts/my-test-1234"
+    )
+
+    assert custom_llm_provider == "fireworks_ai"
+    assert model == "accounts/my-test-1234"
+
+
 def test_get_llm_provider_catch_all():
     _, response, _, _ = litellm.get_llm_provider(model="*")
     assert response == "openai"

litellm/utils.py

@@ -4463,7 +4463,7 @@ def get_llm_provider(
                 dynamic_api_key = api_key or get_secret("DEEPSEEK_API_KEY")
             elif custom_llm_provider == "fireworks_ai":
                 # fireworks is openai compatible, we just need to set this to custom_openai and have the api_base be https://api.fireworks.ai/inference/v1
-                if not model.startswith("accounts/fireworks/models"):
+                if not model.startswith("accounts/"):
                     model = f"accounts/fireworks/models/{model}"
                 api_base = api_base or "https://api.fireworks.ai/inference/v1"
                 dynamic_api_key = api_key or (