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fix(langchain): normalize anthropic cache token metrics #411

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Merged
Abhijeet Prasad (AbhiPrasad) merged 1 commit into from
May 11, 2026
+17 −0
Merged

fix(langchain): normalize anthropic cache token metrics #411

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13 changes: 13 additions & 0 deletions py/src/braintrust/integrations/langchain/callbacks.py
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Original file line number Diff line number Diff line change
Expand Up @@ -656,6 +656,19 @@ def _get_metrics_from_response(response: LLMResult):
if cache_creation is not None:
metrics["prompt_cache_creation_tokens"] = cache_creation

cache_tokens = (cache_read or 0) + (cache_creation or 0)
prompt_tokens = metrics.get("prompt_tokens")
completion_tokens = metrics.get("completion_tokens")
total_tokens = metrics.get("total_tokens")
if (
cache_tokens
and prompt_tokens is not None
and completion_tokens is not None
and total_tokens == prompt_tokens + completion_tokens
):
metrics["prompt_tokens"] = prompt_tokens + cache_tokens
metrics["total_tokens"] = total_tokens + cache_tokens

if not metrics or not any(metrics.values()):
llm_output: dict[str, Any] = response.llm_output or {}
metrics = llm_output.get("token_usage") or llm_output.get("estimatedTokens") or {}
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4 changes: 4 additions & 0 deletions py/src/braintrust/integrations/langchain/test_callbacks.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1087,6 +1087,8 @@ def test_prompt_caching_tokens(logger_memory_logger):
assert "prompt_cache_creation_tokens" in first_metrics
assert first_metrics["prompt_cache_creation_tokens"] > 0
assert first_metrics["prompt_cached_tokens"] == 0
assert first_metrics["prompt_tokens"] >= first_metrics["prompt_cache_creation_tokens"]
assert first_metrics["total_tokens"] == first_metrics["prompt_tokens"] + first_metrics["completion_tokens"]

second_metrics = None
for attempt in range(3):
Expand Down Expand Up @@ -1116,6 +1118,8 @@ def test_prompt_caching_tokens(logger_memory_logger):

assert second_metrics is not None
assert second_metrics["prompt_cached_tokens"] > 0
assert second_metrics["prompt_tokens"] >= second_metrics["prompt_cached_tokens"]
assert second_metrics["total_tokens"] == second_metrics["prompt_tokens"] + second_metrics["completion_tokens"]


@pytest.mark.vcr
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