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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-fable-5

model never mined JSON

A Claude Code model, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.

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

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.219.

First seen — never in a mined build
Last seen — never in a mined build
Builds0 / 149on this box, as of v2.1.308
Written about v2.1.170 first named in a changelog, 9 Jun 2026

In the changelogs

11

Releases whose published page names claude-fable-5.

  1. v2.1.295
    Haiku 5.5 gets a medium-effort thinking default in a model list

    A model list now includes claude-haiku-5-5 with thinking set to medium effort, and the model appears in more places than before

    found in this entry's text, named in this entry

  2. v2.1.280
    New models are unpinned from launch-time forced effort by default; existing installs stay pinned

    Newly launched models like claude-opus-4-7 and claude-fable-5 stay pinned to a launch effort level unless unpinned, but only on installs that predate this build

    found in this entry's text

  3. v2.1.257
    Fable 5.1 model introduced

    A claude-fable-5-1 model id is recognized and becomes the fable family default, with UI text updated to Fable 5.1.

    found in this entry's text

  4. v2.1.257
    Automatic migration of claude-fable-5 model alias to fable

    If your model setting says claude-fable-5, startup rewrites it to the fable alias automatically.

    found in this entry's text, named in this entry

  5. 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.

    found in this entry's text

  6. v2.1.246
    The claude-api skill's documents moved out of the bundle, unchanged

    The claude-api skill's documents moved to separate files with identical content and paths.

    found in this entry's text

  7. v2.1.221
    Model picker colours the new model names

    The model picker now colours Fable 5, Mythos 5 and Sonnet 5 in its list.

    named in this entry, found in this entry's text

  8. 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.

    found in this entry's text

  9. v2.1.195
    Model Catalog: New and Updated Models

    found in this entry's text

  10. v2.1.174
    Advisor Model Capability Enforcement

    found in this entry's text

  11. v2.1.170
    Claude Fable 5 Model Support

    found in this entry's text

First cited

2

The earliest release whose published evidence quoted claude-fable-5 was v2.1.170, 9 Jun 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.

ReleaseDateThe span that was quoted
v2.1.1709 Jun 2026claude-fable-5
v2.1.24827 Aug 2026["fable-5", "claude-fable-5"]

Presence across releases

0

The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.

Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the model does. All models.

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