Anthropic · Claude
Claude Sonnet 4.5
SupersededRelease date TBDMultimodal model
Step-change Sonnet that beat Opus 4.1 at 1/5 the price; 77.2% SWE-bench. Debuted the 1M context window in beta. Superseded by Sonnet 4.6. $3/$15. Guide gives conflicting month-only release (Jul/Sep 2025).
- API string
- claude-sonnet-4-5
- Context window
- 200K ctx
- Tier
- Balanced
Release & change timeline
No dated events logged for this version yet.
Patches, price changes, benchmarks, and deprecations for Claude Sonnet 4.5 will appear here as they’re recorded. Follow the broader Catch Me Up digest in the meantime.
Part of the Claude version timeline. Catch Me Up — everything that changed across AI & smart home ↗