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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.219 ·

Opus 5 replaces Opus 4.8 as the default Opus model

Opus 5 is now the default Opus, with a 1M-context option in the model picker.

You'll notice Notable New Features
JSON All of v2.1.219
You'll noticeTier: how much it should matter to you
5Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
ModelsArea: what it touches
New FeaturesKind: in v2.1.219,
What probably matters to youSection of the release
What

The bundled model catalog gains claude-opus-5 and the opus alias now points at it, so anything resolving the newest Opus resolves Opus 5 instead of Opus 4.8.

Details
  • Catalog entry: display name "Opus 5", knowledge cutoff "May 2026", 1M-token context with supports_1m_suffix, max_output_tokens default 64000 and upper 128000, pricing: "tier_5_25", default_effort: "high", fallback_3p: "claude-opus-4-8", vertex_region_env_var "VERTEX_REGION_CLAUDE_5_OPUS", and a new capability tag opus_5_prompt_bundle.
  • Provider ids ship for bedrock (us.anthropic.claude-opus-5), vertex, foundry, mantle (anthropic.claude-opus-5) and gateway. The opus alias resolves to claude-opus-5 for first-party, bedrock, vertex, mantle and anthropic_aws; foundry still maps to claude-opus-4-6 and gateway to claude-opus-4-7.
  • Three internal default-model constants changed from the literal "opus48" to "opus5", and the first-party preference order went from ["opus48","opus47","opus46","opus45"] to ["opus5","opus48","opus47","opus46","opus45"]. The alias table gained "claude-opus-5": "opus5" and latest_per_family.opus moved to claude-opus-5.
  • The picker shows a plain "Opus" row plus an "Opus (1M context)" variant, and Opus 4.8 is demoted to "Opus 4.8 · Previous Opus version". OPUS_NAME is now "Claude Opus 5" with the old pair kept as PREV_OPUS_ID / PREV_OPUS_NAME.
  • Pricing suffix lookups now query claude-opus-5, unrecognized-model fallbacks return "claude-opus-5" instead of "claude-opus-4-8", and claude-fable-5 falls back to it via fallback_3p.
  • The catalog data is unconditional in this build; whether a row is offered still depends on the model being available for the active account and provider, which the picker checks via provider id / modelOverrides.
Evidence

Opus 5 - best for everyday, complex tasks, Opus 5 with 1M context window - for long sessions with large codebases, opus_5_prompt_bundle, PREV_OPUS_NAME: "Claude Opus 4.8", claude-opus-5

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

Read from
Names in the bundleopusclaude-opus-5VERTEX_REGION_CLAUDE_5_OPUS
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agreeAdded 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 →

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