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Sweep 08 Oct 2026 · 18:53Z Build v2.1.295 516 read Stable v2.1.286 Latest v2.1.295 Next v2.1.295 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.290 ·

Fallback for unsupported API beta options can now follow other error types

Claude Code can now match API errors other than status 400 to the beta options it sent, so its fallback may trigger more often

You'll notice Improvements
JSON All of v2.1.290
You'll noticeTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
API ErrorsArea: what it touches
ImprovementsKind: in v2.1.290,
ImprovementsSection of the release

Unclear It is not clear what kinds of error the new check matches.

What

Beta headers are optional labels Claude Code sends to the API to turn on features that are still in testing. When a request fails, Claude Code tries to work out whether one of those labels caused it. Before, it only did this for errors with status 400. It now runs an extra check on errors of any status. The older check, which reads the error message, still applies only to status 400.

Why

The fallback for unsupported beta headers may now kick in for errors it previously ignored.

How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtIt is not clear what kinds of error the new check matches.

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