Fix #2645: Remove 'models/' prefix from LLM model names

Co-Authored-By: Joe Moura <joao@crewai.com>

tests/test_agent_model_name.py

@@ -0,0 +1,39 @@
+import pytest
+from unittest.mock import MagicMock, patch
+from crewai import Agent
+from crewai.llm import LLM
+
+
+def test_normalize_model_name_method():
+    """Test that the _normalize_model_name method correctly handles model names with 'models/' prefix"""
+    agent = Agent(
+        role="Test Agent",
+        goal="Test goal",
+        backstory="Test backstory",
+        llm="gpt-4"
+    )
+    
+    model_with_prefix = "models/gemini/gemini-1.5-flash"
+    normalized_name = agent._normalize_model_name(model_with_prefix)
+    assert normalized_name == "gemini/gemini-1.5-flash"
+    
+    regular_model = "gpt-4"
+    assert agent._normalize_model_name(regular_model) == "gpt-4"
+    
+    assert agent._normalize_model_name(None) is None
+    
+    assert agent._normalize_model_name(123) == 123
+
+
+def test_agent_with_regular_model_name():
+    """Test that the Agent class doesn't modify normal model names"""
+    with patch('crewai.agent.LLM') as mock_llm:
+        agent = Agent(
+            role="Test Agent",
+            goal="Test goal",
+            backstory="Test backstory",
+            llm="gpt-4"
+        )
+        
+        args, kwargs = mock_llm.call_args
+        assert kwargs["model"] == "gpt-4"