Anthropic · First-party API

claude-opus-4-5-20251101

ActiveAvailable until at least Nov 24, 2026

Anthropic lists claude-opus-4-5-20251101 as active and guarantees it until at least Nov 24, 2026. That is the earliest it could be retired, not a shutdown date; no retirement is announced. Source: platform.claude.com · checked Oct 23, 2026