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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 v2.1.219

The API skill's model placeholders now resolve to Claude Opus 5, with the previous Opus kept as a separate placeholder

You'll notice
Useful2 Signal0
Skills

The API skill's model placeholders now render Opus 5, keeping the previous Opus named separately.

/claude-api
What

The substitution map that renders the bundled claude-api skill docs moved OPUS_ID/OPUS_NAME onto Claude Opus 5 and added two keys for the outgoing model.

Details
  • Every doc writing model="{{OPUS_ID}}" now emits the new ID, as do the deprecation targets and the Bedrock ID table.
  • The alias table keeps opus and adds an opus 5 row.
  • PREV_OPUS_ID/PREV_OPUS_NAME carry claude-opus-4-8 so migration text can name both.
  • The /claude-api skill is registered with no isEnabled gate, so this is what users of that skill get on this build.
Evidence

OPUS_ID: "claude-opus-5"

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

See this entry in the whole of v2.1.219 →