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Sweep 22 Sep 2026 · 17:19Z Build v2.1.280 501 read Stable v2.1.267 Latest v2.1.280 Next v2.1.280 Feeds RSS JSON llms.txt Unofficial
Claude Code v2.1.257 ·

New system-prompt section for reduced delegation on Opus 5

A new prompt section adds reduced-delegation guidance for Opus-class models, skipped if already cached in memory.

TierNothing to try yethow much it should matter to you
Useful4my rating, 1 to 5
Signal4worth watching, 1 to 5
AreaSystem Promptwhat it touches
KindIn Developmentin v2.1.257,
Nothing to try yet No documentation found

A new prompt section adds reduced-delegation guidance for Opus-class models, skipped if already cached in memory.

A new system-prompt section, opus5_reduced_delegation, adds guidance text for Opus-class models. It's skipped if that guidance is already present in a cached memory value.

Read from
Names in the bundleopus5_reduced_delegation
Feature flag
tengu_slate_bittern Not enough to say

Nothing here resolved what this flag was doing on this version, so nothing here should be read as on or off.

This account: no value returned · anonymous baseline: no value returned · compiled default in v2.1.257: on

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

Read once, for one account on one subscription tier, against v2.1.257. It isn't a statement about your account. What a flag value here can and cannot tell you

How sure we are
One source agreesOne thing we can check says the same as this entry.
The name it cites is new in this buildNew in this build: tengu_slate_bittern

See this entry in the whole of v2.1.257 →

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