diff --git a/lib/crewai/src/crewai/utilities/internal_instructor.py b/lib/crewai/src/crewai/utilities/internal_instructor.py
index 86517c1ce..36472482c 100644
--- a/lib/crewai/src/crewai/utilities/internal_instructor.py
+++ b/lib/crewai/src/crewai/utilities/internal_instructor.py
@@ -98,7 +98,14 @@ class InternalInstructor(Generic[T]):
         else:
             provider = "openai"  # Default fallback
 
-        return instructor.from_provider(f"{provider}/{model_string}")
+        extra_kwargs: dict[str, Any] = {}
+        if self.llm is not None and not isinstance(self.llm, str):
+            for attr in ("base_url", "api_key"):
+                value = getattr(self.llm, attr, None)
+                if value is not None:
+                    extra_kwargs[attr] = value
+
+        return instructor.from_provider(f"{provider}/{model_string}", **extra_kwargs)
 
     def _extract_provider(self) -> str:
         """Extract provider from LLM model name.
diff --git a/lib/crewai/tests/utilities/test_converter.py b/lib/crewai/tests/utilities/test_converter.py
index 2df350c0d..2c0a4ce4c 100644
--- a/lib/crewai/tests/utilities/test_converter.py
+++ b/lib/crewai/tests/utilities/test_converter.py
@@ -940,6 +940,8 @@ def test_internal_instructor_real_unsupported_provider() -> None:
     mock_llm.is_litellm = False
     mock_llm.model = "unsupported-model"
     mock_llm.provider = "unsupported"
+    mock_llm.base_url = None
+    mock_llm.api_key = None
 
     # This should raise a ConfigurationError from the real instructor library
     with pytest.raises(Exception) as exc_info:
@@ -952,3 +954,45 @@ def test_internal_instructor_real_unsupported_provider() -> None:
 
     # Verify it's a configuration error about unsupported provider
     assert "Unsupported provider" in str(exc_info.value) or "unsupported" in str(exc_info.value).lower()
+
+
+def test_internal_instructor_forwards_base_url_and_api_key() -> None:
+    """base_url and api_key on the LLM must flow into instructor.from_provider."""
+    from crewai.utilities.internal_instructor import InternalInstructor
+
+    mock_llm = Mock()
+    mock_llm.is_litellm = False
+    mock_llm.model = "gpt-4o"
+    mock_llm.provider = "openai"
+    mock_llm.base_url = "https://custom.example.com/v1"
+    mock_llm.api_key = "sk-custom"
+
+    with patch("instructor.from_provider") as mock_from_provider:
+        mock_from_provider.return_value = Mock()
+
+        InternalInstructor(content="x", model=SimpleModel, llm=mock_llm)
+
+        mock_from_provider.assert_called_once_with(
+            "openai/gpt-4o",
+            base_url="https://custom.example.com/v1",
+            api_key="sk-custom",
+        )
+
+
+def test_internal_instructor_omits_unset_base_url_and_api_key() -> None:
+    """When base_url/api_key are None, they must not be passed to from_provider."""
+    from crewai.utilities.internal_instructor import InternalInstructor
+
+    mock_llm = Mock()
+    mock_llm.is_litellm = False
+    mock_llm.model = "gpt-4o"
+    mock_llm.provider = "openai"
+    mock_llm.base_url = None
+    mock_llm.api_key = None
+
+    with patch("instructor.from_provider") as mock_from_provider:
+        mock_from_provider.return_value = Mock()
+
+        InternalInstructor(content="x", model=SimpleModel, llm=mock_llm)
+
+        mock_from_provider.assert_called_once_with("openai/gpt-4o")