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fix(aws): fall back to auto tool_choice for Claude Sonnet 5.5 on Bedrock #7631

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fix(aws): fall back to auto tool_choice for Claude Sonnet 5.5 on Bedrock #7631

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1 change: 1 addition & 0 deletions livekit-plugins/livekit-plugins-aws/livekit/plugins/aws/llm.py
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Original file line number Diff line number Diff line change
Expand Up @@ -61,6 +61,7 @@
# this model.'). Matched the same way as the list above.
_MODELS_REJECTING_FORCED_TOOL_CHOICE = (
"claude-opus-5-5",
"claude-sonnet-5-5",
"claude-fable-5-1",
)

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7 changes: 5 additions & 2 deletions tests/test_plugin_aws_llm.py
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Expand Up @@ -152,22 +152,25 @@ async def _tool_choice(model: str, tool_choice: ToolChoice) -> dict:


async def test_forced_tool_choice_sent_as_auto_for_opus_5_5() -> None:
# Claude Opus 5.5 and Fable 5.1 reject forced tool use with a ValidationException
# Claude Opus 5.5, Sonnet 5.5 and Fable 5.1 reject forced tool use with a ValidationException
# ('tool_choice: type "tool" and "any" are not supported for this model.').
for model in (
"us.anthropic.claude-opus-5-5",
"global.anthropic.claude-opus-5-5",
"anthropic.claude-opus-5-5",
"us.anthropic.claude-sonnet-5-5",
"global.anthropic.claude-sonnet-5-5",
"us.anthropic.claude-fable-5-1",
):
assert await _tool_choice(model, "required") == {"auto": {}}
assert await _tool_choice(model, _NAMED) == {"auto": {}}


async def test_forced_tool_choice_kept_for_other_models() -> None:
# Opus 5 and Fable 5 still accept any/tool; "claude-fable-5" must not match "-5-1".
# Opus 5, Sonnet 5 and Fable 5 still accept any/tool; "claude-fable-5" must not match "-5-1".
for model in (
"us.anthropic.claude-opus-5",
"us.anthropic.claude-sonnet-5",
"us.anthropic.claude-fable-5",
"us.anthropic.claude-sonnet-4-6",
):
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