Claude Code v2.1.219 · 24 Jul 2026
The API skill's model placeholders now resolve to Claude Opus 5, with the previous Opus kept as a separate placeholder
The API skill's model placeholders now render Opus 5, keeping the previous Opus named separately.
You'll notice Tier: how much it should matter to you
2 Useful: my rating, 1 to 5
0 Signal: worth watching, 1 to 5
Skills Area: what it touches
New Features Kind: in v2.1.219, 24 Jul 26
New Features Section of the release
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}}" The alias table keeps opus opus 5 row. PREV_OPUS_ID/PREV_OPUS_NAME carry claude-opus-4-8 so migration text can name both.The /claude-api Evidence
OPUS_ID: "claude-opus-5 "
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
How sure we are
One source agrees One thing we can check says the same as this entry.
Anthropic's release notes agree Added Claude Opus 5 (claude-opus-5), now the default Opus model — 1M context, fast mode at $10/$50 per Mtok
See this entry in the whole of v2.1.219 →
24 Jul 2026 · 166 entries, this one is #49.
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Names in this entry
setting model Change the model Claude Code starts with
setting opus Opus 5 is now the default Opus, with a 1M-context option in the model picker.
model claude-opus-4-8 Opus 5 is now the default Opus, with a 1M-context option in the model picker.
slash /claude-api Skill .Claude API and Managed Agents reference material for your project's language. Also activates automatically when your code imports anthropic or @anthropic-ai/sdk. Run migrate to update existing Claude API code to a newer model. Run upgrade to move your project's Anthropic SDK dependency across a major version, currently the Python anthropic package from 0.x to 1.x. Run managed-agents-onboard for a walkthrough that creates a new Managed Agent. Run prompt-audit to flag instructions written for older models in your prompts, skills, and tool descriptions and propose fixes as a diff. Run cost-optimize to profile where your project's Claude API spend goes and propose savings from options such as prompt caching, trimming unneeded input and output tokens, batch processing, effort, and model choice, one change at a time. Run build-eval to build an eval set for your Claude-powered app, and hillclimb to iteratively improve the app against an existing eval. The prompt-audit subcommand requires Claude Code v2.1.221 or later, upgrade requires v2.1.236 or later, cost-optimize requires v2.1.247 or later, and build-eval and hillclimb require v2.1.259 or later
model claude-opus-5 Opus 5 is now the default Opus, with a 1M-context option in the model picker.
Anthropic's note
Upstream's own release notes for v2.1.219 name something this entry names, so the two are probably about the same change. Probably: the pairing is made on a shared name rather than on the words around it.
Added Claude Opus 5 (claude-opus-5
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opus5 in the local model listing
Under the hood Models
In v2.1.219 New Features release-page order
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New protocol capability interrupt_cancel_queued_v1 on system/init
Under the hood SDK Protocol
