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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.100 10 Apr 2026

Numeric Length Anchors for Opus 4.6 [Gradual Rollout]

What

A new system prompt section that enforces strict word-count limits on Claude's text output when using Opus 4.6.

Details

Text between tool calls is limited to ≤25 words
Final responses are limited to ≤100 words unless the task requires more detail
Only active when using the Opus 4.6 model AND the server-side quiet_salted_ember flag is set to "true"
Injected as a numeric_length_anchors prompt section in the system prompt

Evidence

Length anchor prompt section (search for "numeric_length_anchors" and "≤25 words")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.100 →