Pro model · Anthropic · updated 2026-09-26

Claude Opus 5

Previous Opus generation, still formidable. API id: anthropic/claude-opus-5

The previous Opus generation: nearly flagship-grade, often at friendlier pricing.

Best for

Same shape of work as 5.5 — deep reasoning and code — when you want an alternative tuning to compare against.

Use it

Pick it in the Web Agent or Chat picker, or pass anthropic/claude-opus-5 to /api/agent.php. Needs Pro or your own key.