Anthropic · Claude
Claude Opus 4.5
ActiveThe efficiency inflection point: 67% Opus price reset to $5/$25 with 76% fewer output tokens. 200K context (1M in beta). Still active as the most affordable/200K-context Opus fallback. Guide gives only month (Nov 2025) for release.
About this version
Claude Opus 4.5 is the flagship version of Anthropic’s Claude series released in November 2025 and remains active. It offers a 200 000‑token context window (with a 1 million‑token beta option) and introduced an efficiency‑focused pricing change, resetting the cost to $5/$25 while reducing output tokens by roughly three‑quarters, positioning it as the most affordable Opus model with the large‑context capability.
- API string
- claude-opus-4-5
- Context window
- 200K ctx
- Tier
- Flagship
- Released
- Nov 24, 2025
Release & change timeline
No dated events logged for this version yet.
Patches, price changes, benchmarks, and deprecations for Claude Opus 4.5 will appear here as they’re recorded. Follow the broader Catch Me Up digest in the meantime.
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Part of the Claude version timeline. Catch Me Up — everything that changed across AI & smart home ↗