Claude Opus 4.6
AnnouncementsIntroducing Claude Opus 4.6Feb 5, 2026We’re upgrading our smartest model.The new Claude Opus 4.6 improves on its predecessor’s coding skills….
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Anthropic’s original take home assignment open sourced
Anthropic’s Original Performance Take-Home This repo contains a version of Anthropic’s original performance take-home, before Claude Opus 4.5 started doing…
Anthropic Outage for Opus 4.5 and Sonnet 4/4.5 across all services
Elevated errors across many models Incident Report for Claude Postmortem Between 13:25 and 14:43 PT today, Claude Opus 4.5 and…
Anthropic introduces cheaper, more powerful, more efficient Opus 4.5 model
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Claude Opus 4 and 4.1 can now end a rare subset of conversations
AlignmentClaude Opus 4 and 4.1 can now end a rare subset of conversationsAug 15, 2025We recently gave Claude Opus 4…