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Langchain model token counting bug fix #268

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Langchain model token counting bug fix #268

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b435331
Fix `_parse_usage` function for Langchain`CallbackHandler`
adriantqw Jun 20, 2025
615068d
Fix issue
adriantqw Jun 20, 2025
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18 changes: 14 additions & 4 deletions posthog/ai/langchain/callbacks.py
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Original file line number Diff line number Diff line change
Expand Up @@ -759,10 +759,20 @@ def _parse_usage(response: LLMResult) -> ModelUsage:
if generation_chunk.generation_info and (
"usage_metadata" in generation_chunk.generation_info
):
llm_usage = _parse_usage_model(
generation_chunk.generation_info["usage_metadata"]
)
break
if generation_chunk.generation_info["usage_metadata"]:
llm_usage = _parse_usage_model(
generation_chunk.generation_info["usage_metadata"]
)
break

elif generation_chunk.message and (
"usage_metadata" in generation_chunk.message
):
if generation_chunk.message["usage_metadata"]:
llm_usage = _parse_usage_model(
generation_chunk.message["usage_metadata"]
)
break

message_chunk = getattr(generation_chunk, "message", {})
response_metadata = getattr(message_chunk, "response_metadata", {})
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