6 people reported

All time, since Oct 1, including 4 thumbs-up on GitHub.

Token use rises as quality drops

“The common factor is the model, so please investigate the model side first.”

Is this your bug? What gets counted gets fixed. Pile on.

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I hit this bug: rapsheet.dev/sheets/claude-code/issues/469/file
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Token usage rises while model performance degrades. Model uses more thinking tokens and longer outputs per request while judgment worsens, with no change on reporters' side.

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Where
model behavior
Versions
2.1.287
Platforms
macOS
How bad
Breaks a normal workflow.

Original reports2, newest first

  1. Unexpected increase in API token usage and degraded performance#98947
  2. Claude Opus 5.5 behavior shift starting 2026-10-01: ~2x thinking, ~1.6x output, worse judgment — also observed outside Claude Code#98679

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