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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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tengu_set_model_unrecognized

flag never mined JSON

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

Switching to a model you aren't allowed to use now falls back to a substitute instead of failing.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.239.

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 v2.1.239 first named in a changelog, 21 Aug 2026

In the changelogs

3

Releases whose published page names tengu_set_model_unrecognized.

  1. v2.1.268
    Model access checks now do a live entitlement re-probe before blocking

    Blocked model access now triggers a live re-check with the server before finalizing the block

    gate cited by this entry

  2. v2.1.260
    New unrecognized-model telemetry on /model switch

    Switching to an unrecognized model now fires its own telemetry event.

    found in this entry's text, gate cited by this entry

  3. v2.1.239
    Requesting a model you are not permitted to use can now step down instead of failing

    Switching to a model you aren't allowed to use now falls back to a substitute instead of failing.

    gate cited by this entry, found in this entry's text

Gate readings

0

No release here has a gate table behind it for this flag. Most published releases have none at all: the readings exist only for versions the pipeline captured flag state on.

First cited

1

The earliest release whose published evidence quoted tengu_set_model_unrecognized was v2.1.260, 3 Sep 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
v2.1.2603 Sep 2026tengu_set_model_unrecognized

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 feature flag does. All feature flags.

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