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fix(vertex_ai): Vertex AI 400 Error: Model used by GenerateContent request (models/gemini-3-*) and CachedContent (models/gemini-3-*) has to be the same #19193

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Merged
krrishdholakia merged 3 commits into from
Jan 16, 2026
Merged

fix(vertex_ai): Vertex AI 400 Error: Model used by GenerateContent request (models/gemini-3-*) and CachedContent (models/gemini-3-*) has to be the same #19193

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7251e3e
fix(vertex_ai): include model in context cache key generation
anand-kamble Jan 16, 2026
df48f48
Merge remote-tracking branch 'upstream/main'
anand-kamble Jan 16, 2026
b407952
test(vertex_ai): update context caching tests to verify model in cach…
anand-kamble Jan 16, 2026
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4 changes: 2 additions & 2 deletions litellm/llms/vertex_ai/context_caching/vertex_ai_context_caching.py
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Original file line number Diff line number Diff line change
Expand Up @@ -304,7 +304,7 @@ def check_and_create_cache(

## CHECK IF CACHED ALREADY
generated_cache_key = local_cache_obj.get_cache_key(
messages=cached_messages, tools=tools
messages=cached_messages, tools=tools, model=model
)
google_cache_name = self.check_cache(
cache_key=generated_cache_key,
Expand Down Expand Up @@ -433,7 +433,7 @@ async def async_check_and_create_cache(

## CHECK IF CACHED ALREADY
generated_cache_key = local_cache_obj.get_cache_key(
messages=cached_messages, tools=tools
messages=cached_messages, tools=tools, model=model
)
google_cache_name = await self.async_check_cache(
cache_key=generated_cache_key,
Expand Down
8 changes: 4 additions & 4 deletions tests/test_litellm/llms/vertex_ai/context_caching/test_vertex_ai_context_caching.py
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Expand Up @@ -187,9 +187,9 @@ def test_check_and_create_cache_existing_cache_found(
assert returned_params == optional_params
assert returned_cache == "existing_cache_name"

# Verify cache key was generated with tools
# Verify cache key was generated with tools and model
mock_cache_obj.get_cache_key.assert_called_once_with(
messages=cached_messages, tools=self.sample_tools
messages=cached_messages, tools=self.sample_tools, model="gemini-1.5-pro"
)

@pytest.mark.parametrize(
Expand Down Expand Up @@ -460,9 +460,9 @@ async def test_async_check_and_create_cache_existing_cache_found(
assert returned_params == optional_params
assert returned_cache == "existing_cache_name"

# Verify cache key was generated with tools
# Verify cache key was generated with tools and model
mock_cache_obj.get_cache_key.assert_called_once_with(
messages=cached_messages, tools=self.sample_tools
messages=cached_messages, tools=self.sample_tools, model="gemini-1.5-pro"
)

@pytest.mark.asyncio
Expand Down
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