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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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13 changes: 7 additions & 6 deletions posthog/ai/langchain/callbacks.py
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Original file line number Diff line number Diff line change
Expand Up @@ -756,12 +756,13 @@ def _parse_usage(response: LLMResult) -> ModelUsage:
break

for generation_chunk in generation:
if generation_chunk.generation_info and (
"usage_metadata" in generation_chunk.generation_info
):
llm_usage = _parse_usage_model(
generation_chunk.generation_info["usage_metadata"]
)
usage_metadata = (
(generation_chunk.generation_info or {}).get("usage_metadata") or
(generation_chunk.message or {}).get("usage_metadata") or
{}
)
if usage_metadata:
llm_usage = _parse_usage_model(usage_metadata)
break

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