Claude Opus 5 Official ReleaseProvider report

Name: Claude Opus 5 Official Release
Published: 2026-07-24

2026-07-24Based on the main comparison table on Anthropic's official Opus 5 release page; methodology details were cross-checked against the official System Card published the same day. In the table, the Mythos 5 scores for HealthBench Professional and BioMysteryBench (human solved) are consolidated under Claude Fable 5 according to the site's identity rules, with the original mode retained in raw.evaluation_mode.

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Claude Opus 5 Official ReleaseProvider report

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2026-07-24Based on the main comparison table on Anthropic's official Opus 5 release page; methodology details were cross-checked against the official System Card published the same day. In the table, the Mythos 5 scores for HealthBench Professional and BioMysteryBench (human solved) are consolidated under Claude Fable 5 according to the site's identity rules, with the original mode retained in raw.evaluation_mode.