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Sweep 10 Nov 2026 · 02:18Z Build v2.1.322 539 read Stable v2.1.311 Latest v2.1.322 Next v2.1.322 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.269 ·

Model-parameter allowlist changed from array to Set

Internal list of allowed API request fields switched from an array to a Set

Under the hood Internal Changes
JSON All of v2.1.269
Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
ElsewhereArea: what it touches
Internal ChangesKind: in v2.1.269,
Internal ChangesSection of the release

Unclear The finding does not say where this allowlist is used or what request handling it affects.

What

A behind-the-scenes list of top-level fields allowed in Claude API requests (things like model, system, and tools) was changed from a plain array to a Set, an internal data structure used for faster membership checks.

Why

This is an internal efficiency change with no visible effect on how Claude Code behaves.

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 doubtThe finding does not say where this allowlist is used or what request handling it affects.

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