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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 v2.1.223

1M-context and compaction checks now go through model capability lookup

Use it now
Useful3 Signal0
Compaction Notable

Long-context eligibility is now looked up per model, and DISABLE_COMPACT turns off compaction.

DISABLE_COMPACT
What

Long-context eligibility resolves the canonical model id before deciding, and compaction has its own companion check.

Details
  • claude-mythos-preview is treated as eligible alongside any model whose capability record declares native 1M context.
  • The companion helper disables compaction when DISABLE_COMPACT is set, or when the resolved model id does not start with claude-.
Evidence

claude-mythos-preview

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.223 →