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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 v2.1.228

More models now show a deprecation date

You'll notice
Useful3 Signal5
Models not in their notes

More models now report a concrete deprecation date, including one named claude-mythos-preview.

claude-mythos-preview
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.

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 v2.1.228 →