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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

Opus 5 wired through region env vars, refusal fallbacks and pricing copy

You'll notice
Useful3 Signal0
Models Notable not in their notes

An Opus 5 model is wired through region variables, fast mode, 1M context and pricing text.

VERTEX_REGION_CLAUDE_5_OPUS
What

Supporting plumbing for a new Opus 5 model lands across region selection, effort/speed handling, context eligibility and billing copy.

Details
  • VERTEX_REGION_CLAUDE_5_OPUS joins the recognized Vertex region environment variables.
  • The effort/speed table treats claude-opus-5 like claude-opus-4-8 for fast mode.
  • 1M-context eligibility now matches on claude-opus-5, and the internal model-family list gains "opus5" ahead of "opus48".
  • The upsell/pricing copy branch keys on claude-opus-5 instead of claude-opus-4-8.
  • The system-prompt blurb drops Opus 4.8 and now reads "The most recent Claude models are the Claude 5 family and Haiku 4.5."
  • Some Mythos-era strings were deleted, including one reading "This model's safeguards flagged this message. This sometimes happens with safe, normal conversations."
Evidence

VERTEX_REGION_CLAUDE_5_OPUS

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 v2.1.219 →