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Sweep 06 Nov 2026 · 01:32Z Build v2.1.319 537 read Stable v2.1.311 Latest v2.1.318 Next v2.1.319 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.277 ·

Model catalog version bump and per-surface model reassignment

Bundled model catalog updated to version 629 with model reassignments across ccr, ccd, and other surfaces

Under the hood Internal Changes
JSON All of v2.1.277
Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
ModelsArea: what it touches
Internal ChangesKind: in v2.1.277,
Internal ChangesSection of the release

Unclear The finding does not specify which surfaces ended up on which of the three models after this swap.

What

The bundled model catalog that Claude Code ships with was updated from version 554 to version 629, with a new issue and expiry window. Several catalog surfaces, including ccr and ccd, had the model assigned to their existing slot swapped between claude-fable-5-1, claude-sonnet-5, and claude-opus-5.

Why

This changes which model a given surface falls back to when using the bundled catalog, continuing the same kind of reassignment seen in earlier catalog updates for ccr and ccd.

Read from
Names in the bundleclaude-fable-5-1claude-sonnet-5claude-opus-5
Since it was published

The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.

Added since A small documentation edit on Model configuration touched a line naming claude-fable-5-1 after this was published. Administrators can use `availableModels` in [managed or policy settings](/docs/en/managed-settings) to restrict which models users can select. Entries match a model family such as `sonnet`, a version prefix such as `claude-sonnet-4-5`, or … model-config see the edit
Added since A small documentation edit on Create custom subagents touched a line naming claude-sonnet-5 after this was published. * **Full model ID**: use a full model ID such as `claude-opus-5-5` or `claude-sonnet-5`. Accepts the same values as the `--model` flag sub-agents see the edit
Added since A small documentation edit on model-deprecations touched a line naming claude-opus-5 after this was published. | claude-opus-5-5 | Active | N/A | Not sooner than September 22, 2027 | about-claude/model-deprecations see the edit
Confirmed since Anthropic's documentation has since written up claude-sonnet-5, on browser-use-tool. - claude-sonnet-5 agents-and-tools/tool-use/browser-use-tool see the edit
Confirmed since Anthropic's documentation has since written up claude-fable-5-1, on browser-use-tool. - claude-fable-5-1 agents-and-tools/tool-use/browser-use-tool see the edit
Confirmed since Anthropic's documentation has since written up claude-opus-5, on skills-guide. "model": "claude-opus-5", build-with-claude/skills-guide see the edit
How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtThe finding does not specify which surfaces ended up on which of the three models after this swap.
Anthropic's documentation agreesAnthropic's documentation has since written up claude-opus-5, on skills-guide.

See this entry in the whole of v2.1.277 →

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