diff --git a/litellm/proxy/litellm_pre_call_utils.py b/litellm/proxy/litellm_pre_call_utils.py
index 152438d0573..d91d987fab6 100644
--- a/litellm/proxy/litellm_pre_call_utils.py
+++ b/litellm/proxy/litellm_pre_call_utils.py
@@ -3506,6 +3506,7 @@ _ANTHROPIC_API_HEADER_PROVIDERS: Final = ",".join(
         LlmProviders.ANTHROPIC.value,
         LlmProviders.BEDROCK.value,
         LlmProviders.BEDROCK_MANTLE.value,
+        LlmProviders.GITHUB_COPILOT.value,
         LlmProviders.VERTEX_AI.value,
     )
 )
diff --git a/tests/unit/proxy/test_litellm_pre_call_utils.py b/tests/unit/proxy/test_litellm_pre_call_utils.py
index c97a5d1337f..04650cc2f32 100644
--- a/tests/unit/proxy/test_litellm_pre_call_utils.py
+++ b/tests/unit/proxy/test_litellm_pre_call_utils.py
@@ -7613,7 +7613,7 @@ def test_oauth_credential_entry_is_scoped_to_anthropic_alone():
     assert [entry["custom_llm_provider"] for entry in credential_entries] == ["anthropic"]
 
 
-@pytest.mark.parametrize("custom_llm_provider", ["anthropic", "bedrock", "bedrock_mantle", "vertex_ai"])
+@pytest.mark.parametrize("custom_llm_provider", ["anthropic", "bedrock", "bedrock_mantle", "github_copilot", "vertex_ai"])
 def test_client_anthropic_api_headers_reach_every_anthropic_messages_provider(custom_llm_provider):
     client_headers = {
         "anthropic-beta": "claude-code-20250219,interleaved-thinking-2025-05-14",
diff --git a/tests/unit/proxy/test_proxy_utils.py b/tests/unit/proxy/test_proxy_utils.py
index 44ab2155734..aae31ee2a4b 100644
--- a/tests/unit/proxy/test_proxy_utils.py
+++ b/tests/unit/proxy/test_proxy_utils.py
@@ -2004,7 +2004,7 @@ def test_provider_specific_header():
     )
     # Verify multi-provider support: anthropic headers work across multiple providers
     assert data["provider_specific_header"] == {
-        "custom_llm_provider": "anthropic,bedrock,bedrock_mantle,vertex_ai",
+        "custom_llm_provider": "anthropic,bedrock,bedrock_mantle,github_copilot,vertex_ai",
         "extra_headers": {
             "anthropic-beta": "prompt-caching-2024-07-31",
         },
@@ -2076,7 +2076,7 @@ def test_provider_specific_header_multi_provider():
     assert "provider_specific_header" in data
     assert (
         data["provider_specific_header"]["custom_llm_provider"]
-        == "anthropic,bedrock,bedrock_mantle,vertex_ai"
+        == "anthropic,bedrock,bedrock_mantle,github_copilot,vertex_ai"
     )
     assert data["provider_specific_header"]["extra_headers"] == {
         "anthropic-beta": "context-1m-2025-08-07",