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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

Claude Code v2.1.248 ·

Opus 5, Fable and Mythos in the version and alias tables

Naming tables list Opus 4.8, Sonnet 5, Fable 5 and Mythos 5 with aliases.

Nothing to try yet Notable In Development
JSON All of v2.1.248
Nothing to try yetTier: how much it should matter to you
3Useful: my rating, 1 to 5
5Signal: worth watching, 1 to 5
ModelsArea: what it touches
In DevelopmentKind: in v2.1.248,
What probably matters to youSection of the release

These are naming and alias tables only, and two task-model maps disagree with each other.

What

The family and version table now lists opus 4.8, sonnet 5, fable 5 and mythos 5; display names gain "Fable"; and aliases map fable-5, mythos-5 and opus-5 to full ids. These are naming tables, not availability. Two task-model maps in the same build disagree, one selecting Opus 5 where the other selects Opus 4.8.

Evidence

["fable-5", "claude-fable-5"]

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

See this entry in the whole of v2.1.248 →

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