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claude-code - 💡(How to fix) Fix [Bug] OTEL data missing COST_USD field in API request events (v2.1.122+) [1 participants]

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anthropics/claude-code#56098•Fetched 2026-05-05 05:58:16
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Bug Description Note that we see this across our telemetry data.

Claude Code client versions 2.1.122 and newer stopped emitting the COST_USD field on API request events. Token counts and model names still come through fine - only the cost field is NULL.

Environment Info

  • Platform: darwin
  • Terminal: ghostty
  • Version: 2.1.118
  • Feedback ID: 84929ac9-4496-484f-ba32-b612103ed12a

Errors No explicit errors, it is missing data.

extent analysis

TL;DR

The issue may be resolved by upgrading the Claude Code client version to one that is known to emit the COST_USD field on API request events.

Guidance

  • Verify the version of the Claude Code client being used to confirm it is 2.1.122 or newer, as these versions are reported to have the issue.
  • Check the API request events for any other missing fields to determine if the issue is isolated to the COST_USD field.
  • Test with an older version of the Claude Code client (e.g., 2.1.118) to see if the COST_USD field is emitted correctly.
  • Review the telemetry data to confirm that the issue is consistent across all instances of the Claude Code client with versions 2.1.122 and newer.

Notes

The issue seems to be specific to the COST_USD field and does not affect other fields such as token counts and model names. The cause of the issue is not explicitly stated, but it appears to be related to the version of the Claude Code client.

Recommendation

Apply workaround: Use an older version of the Claude Code client (e.g., 2.1.118) until a fixed version is available, as this version is reported to emit the COST_USD field correctly.

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#api#batch processing#GPU compatibility#latency issue#model loading

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