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Merge pull request #41870 from BerriAI/litellm_bedrock_openai_gpt_min_max_tokens

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fix(bedrock): clamp maxTokens to the 16-token minimum for OpenAI GPT and xAI Grok models on Converse
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Mateo Wang 2026-09-18 17:44:18 -07:00 • committed by GitHub
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2 changed files with 38 additions and 1 deletions
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11
litellm/llms/bedrock/chat/converse_transformation.py
View file

@ -108,6 +108,7 @@ BEDROCK_COMPUTER_USE_TOOLS: Final = [
"bash_",
"text_editor_",
]
BEDROCK_OPENAI_COMPAT_MIN_MAX_TOKENS: Final = 16
# Beta header patterns that are not supported by Bedrock Converse API
# These will be filtered out to prevent errors
@ -378,6 +379,10 @@ class AmazonConverseConfig(BaseConfig):
def _is_openai_gpt_reasoning_model(model: str) -> bool:
return re.search(r"openai\.gpt-\d", model) is not None
@staticmethod
def _requires_min_max_tokens(model: str) -> bool:
return re.search(r"openai\.gpt-\d|xai\.grok-", model) is not None
def _is_nova_2_model(self, model: str) -> bool:
"""
Check if the model is a Nova 2 model that supports reasoningConfig.
@ -1000,7 +1005,11 @@ class AmazonConverseConfig(BaseConfig):
is_thinking_enabled=is_thinking_enabled,
)
if param == "max_tokens" or param == "max_completion_tokens":
optional_params["maxTokens"] = value
optional_params["maxTokens"] = (
max(value, BEDROCK_OPENAI_COMPAT_MIN_MAX_TOKENS)
if isinstance(value, int) and self._requires_min_max_tokens(model)
else value
)
if param == "stream":
optional_params["stream"] = value
if param == "stop":

28
tests/test_litellm/llms/bedrock/chat/test_converse_transformation.py
View file

@ -458,6 +458,34 @@ def test_reasoning_with_forced_tool_choice_switches_to_auto():
assert optional_params["tool_choice"] == {"auto": {}}
@pytest.mark.parametrize(
"model, param, value, expected_max_tokens",
[
("us.openai.gpt-6-astra", "max_tokens", 1, 16),
("us.openai.gpt-6-astra", "max_completion_tokens", 1, 16),
("us.openai.gpt-6-astra", "max_tokens", 64, 64),
("us.xai.grok-4.6", "max_tokens", 1, 16),
("global.xai.grok-4.6", "max_completion_tokens", 1, 16),
("us.xai.grok-4.6", "max_tokens", 32, 32),
("anthropic.claude-sonnet-4-5-20250929-v1:0", "max_tokens", 1, 1),
("arn:aws:bedrock:us-east-1:123456789012:inference-profile/us.openai.gpt-6-astra", "max_tokens", 1, 16),
("arn:aws:bedrock:us-east-1:123456789012:inference-profile/global.xai.grok-4.6", "max_tokens", 1, 16),
("arn:aws:bedrock:us-east-1:123456789012:application-inference-profile/abc123xyz", "max_tokens", 1, 1),
],
)
def test_map_openai_params_enforces_minimum_max_tokens_for_openai_compat_models(
model: str, param: str, value: int, expected_max_tokens: int
):
optional_params = AmazonConverseConfig().map_openai_params(
non_default_params={param: value},
optional_params={},
model=model,
drop_params=False,
)
assert optional_params["maxTokens"] == expected_max_tokens
@pytest.mark.parametrize(
"model",
[