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Sweep 02 Oct 2026 · 18:55Z Build v2.1.288 509 read Stable v2.1.285 Latest v2.1.288 Next v2.1.288 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.287 ·

Rejected beta header detection skips two more kinds of error

Claude Code's check for a rejected beta header on a 400 error now ignores two more kinds of error

Under the hood Internal Changes
JSON All of v2.1.287
Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
APIArea: what it touches
Internal ChangesKind: in v2.1.287,
Internal ChangesSection of the release
What

A beta header is an extra label Claude Code adds to API requests to turn on preview features. When a request fails with a 400 error (the server rejecting the request), Claude Code checks whether a beta header was the cause. That check now stops early for two more kinds of error.

Why

This affects when Claude Code retries a request without the beta header.

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 doubtWhich two kinds of error are now skipped is not shown.

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