Claude Code v2.1.223 ·
1M-context and compaction checks now go through model capability lookup
Long-context eligibility is now looked up per model, and DISABLE_COMPACT turns off compaction.
Use it nowTier: how much it should matter to you
3Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
CompactionArea: what it touches
ImprovementsKind: in v2.1.223,
What probably matters to youSection of the release
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.
See this entry in the whole of v2.1.223 →
