models · anthropic

Claude Mythos Preview

Research preview model achieving highest GPQA Diamond (94.6%) and SWE-Bench Verified (93.9%) of any model on the leaderboard.

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What this registry has checked

Quarantine. We hold the publisher’s own published hash for these weights and have recorded it against this entry. We have not downloaded and hashed the weights ourselves, so the hash is the publisher’s claim, not our measurement.

Weight file SHA-256	d9117e91a2b1b2d4f9ca0016dc987926111bf2a6f291b5b643773f3a3fa0563e
Method	closed-weights

Re-check this yourself → Source → Full record →

What is recorded

Publisher	anthropic
Origin	United States
Licence	Anthropic-TOS
Pulls recorded here	94,019

Reported scores

GPQA Diamond	94.6
AIME 2025	97.5

Reported by a third party and recorded here, not re-run by us.

Elsewhere in the registry

All models → Browse with filters → What will run on my hardware? →

Registry record as of 2026-09-28. 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.