models · anthropic

Claude Opus 4.5

Claude Opus 4.5 — Anthropic's previous flagship, excellent at long-context reasoning and code generation.

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	2f9466008c6e13a19df2bdd85e85c3b00a0f9c79285899c4b6a1aa2475ba420a
Method	closed-weights

Re-check this yourself → Source → Full record →

What is recorded

Publisher	anthropic
Origin	United States
Licence	Anthropic-TOS
Context window	200,000 tokens
Modality	text+image+file->text
Pulls recorded here	138,014

Reported scores

MMLU-Pro	88.9
GPQA Diamond	81
AIME 2025	62.7
LiveCodeBench	73.8
IFBench	43
Humanity's Last Exam	13.2

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

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.