litellm - bug in v1.73.0 #270
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zastrowm
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Jun 23, 2025
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Description
We are seeing litellm failures in the integration tests executed in our PR workflows (example). To understand the issue, pip install litellm v1.73.0 and send the following request:
{ "messages": [ { "role": "user", "content": [ { "text": "What is the time in New York?", "type": "text" } ] } ], "model": "bedrock/us.anthropic.claude-3-7-sonnet-20250219-v1:0", "stream": true, "stream_options": { "include_usage": true }, "tools": [ { "type": "function", "function": { "name": "tool_time", "description": "tool_time", "parameters": { "properties": {}, "type": "object", "required": [] } } } ] }litellm will stream payloads similar to the following:
ModelResponseStream(id='chatcmpl-b6984fa2-5f78-4b53-8e2b-b4429769eb9e', created=1750699986, model='us.anthropic.claude-3-7-sonnet-20250219-v1:0', object='chat.completion.chunk', system_fingerprint=None, choices=[StreamingChoices(finish_reason=None, index=0, delta=Delta(provider_specific_fields=None, content="I'll", role='assistant', function_call=None, tool_calls=None, audio=None), logprobs=None)], provider_specific_fields={}, stream_options={'include_usage': True}, citations=None) ModelResponseStream(id='chatcmpl-b6984fa2-5f78-4b53-8e2b-b4429769eb9e', created=1750699986, model='us.anthropic.claude-3-7-sonnet-20250219-v1:0', object='chat.completion.chunk', system_fingerprint=None, choices=[StreamingChoices(finish_reason=None, index=0, delta=Delta(provider_specific_fields=None, content=' check the current time in New', role=None, function_call=None, tool_calls=None, audio=None), logprobs=None)], provider_specific_fields={}, stream_options={'include_usage': True}, citations=None) ModelResponseStream(id='chatcmpl-b6984fa2-5f78-4b53-8e2b-b4429769eb9e', created=1750699986, model='us.anthropic.claude-3-7-sonnet-20250219-v1:0', object='chat.completion.chunk', system_fingerprint=None, choices=[StreamingChoices(finish_reason=None, index=0, delta=Delta(provider_specific_fields=None, content=' York for you. Let', role=None, function_call=None, tool_calls=None, audio=None), logprobs=None)], provider_specific_fields={}, stream_options={'include_usage': True}, citations=None) ModelResponseStream(id='chatcmpl-b6984fa2-5f78-4b53-8e2b-b4429769eb9e', created=1750699986, model='us.anthropic.claude-3-7-sonnet-20250219-v1:0', object='chat.completion.chunk', system_fingerprint=None, choices=[StreamingChoices(finish_reason=None, index=0, delta=Delta(provider_specific_fields=None, content=' me fetch that information.', role=None, function_call=None, tool_calls=None, audio=None), logprobs=None)], provider_specific_fields={}, stream_options={'include_usage': True}, citations=None) ModelResponseStream(id='chatcmpl-b6984fa2-5f78-4b53-8e2b-b4429769eb9e', created=1750699986, model='us.anthropic.claude-3-7-sonnet-20250219-v1:0', object='chat.completion.chunk', system_fingerprint=None, choices=[StreamingChoices(finish_reason=None, index=0, delta=Delta(provider_specific_fields=None, content='', role='assistant', function_call=None, tool_calls=[ChatCompletionDeltaToolCall(id='tooluse_iZJCYpXyQ_ejPQQ1PZRzOg', function=Function(arguments='', name='tool_time'), type='function', index=0)], audio=None), logprobs=None)], provider_specific_fields={}, stream_options={'include_usage': True}) ModelResponseStream(id='chatcmpl-b6984fa2-5f78-4b53-8e2b-b4429769eb9e', created=1750699986, model='us.anthropic.claude-3-7-sonnet-20250219-v1:0', object='chat.completion.chunk', system_fingerprint=None, choices=[StreamingChoices(finish_reason=None, index=0, delta=Delta(provider_specific_fields=None, content='', role='assistant', function_call=None, tool_calls=[ChatCompletionDeltaToolCall(id=None, function=Function(arguments='', name=None), type='function', index=0)], audio=None), logprobs=None)], provider_specific_fields={}, stream_options={'include_usage': True}) ModelResponseStream(id='chatcmpl-b6984fa2-5f78-4b53-8e2b-b4429769eb9e', created=1750699986, model='us.anthropic.claude-3-7-sonnet-20250219-v1:0', object='chat.completion.chunk', system_fingerprint=None, choices=[StreamingChoices(finish_reason=None, index=0, delta=Delta(provider_specific_fields=None, content='', role='assistant', function_call=None, tool_calls=[ChatCompletionDeltaToolCall(id=None, function=Function(arguments='{}', name=None), type='function', index=1)], audio=None), logprobs=None)], provider_specific_fields={}, stream_options={'include_usage': True}) ModelResponseStream(id='chatcmpl-b6984fa2-5f78-4b53-8e2b-b4429769eb9e', created=1750699986, model='us.anthropic.claude-3-7-sonnet-20250219-v1:0', object='chat.completion.chunk', system_fingerprint=None, choices=[StreamingChoices(finish_reason='tool_calls', index=0, delta=Delta(provider_specific_fields=None, content=None, role=None, function_call=None, tool_calls=None, audio=None), logprobs=None)], provider_specific_fields={}, stream_options={'include_usage': True})Notice that we have only 1 tool call but there are
ChatCompletionDeltaToolCallpayloads with mismatching indices. All related tool call payloads should have the same index otherwise we cannot correctly piece together the response.This issue appears to be a bug introduced while addressing BerriAI/litellm#11580. As a temporary workaround, we are setting our litellm dependency version to be <1.73.0.
Related Issues
Type of Change
Testing
hatch run prepareChecklist
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