You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
5Signal: worth watching, 1 to 5
ModelsArea: what it touches
New FeaturesKind: in v2.1.228,
What probably matters to youSection of the release
What
The deprecation-date table gains 3.5 Haiku, Opus 4 and 4.1, Sonnet 4 aliases and snapshots, and claude-mythos-preview, so those models report a concrete date instead of none.
Details
Example entry: claude-opus-4-1-20250805 is dated August 5th, 2026.
Evidence
"claude-opus-4-1-20250805": "August 5th, 2026"
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
