models · anthropic

Claude Fable 5.1

Claude Fable 5.1 — catalogued from third-party evaluation data; no weights held by Sovereign Frontier.

What this registry has checked

Closed. A third party reports this model and we have recorded their numbers. Nothing of our own: no weights seen, no publisher hash held. Treat every figure here as their claim.

Method	third-party-report

Re-check this yourself → Source → Full record →

What is recorded

Publisher	anthropic
Origin	United States
Licence	Anthropic-TOS
Context window	1,000,000 tokens
Modality	text+image+file->text

Reported scores

GPQA Diamond	93.7
Humanity's Last Exam	59.1

Reported by a third party and recorded here, not re-run by us. Source: artificialanalysis.ai/api/v2.

Elsewhere in the registry

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Registry record as of 2026-09-01. Identity, licence and parameter count are properties of a release and do not move; tier can, and the verify link above re-checks it against the live registry rather than this page.