Anthropic · Claude
Claude Sonnet 4.5
Supersededsource:wikidata https://www.wikidata.org/wiki/Q136459942
About this version
Claude Sonnet 4.5 is a balanced‑tier version of Anthropic’s Claude family released on 29 September 2025 and now superseded. It provides an expanded context window of up to 200 000 tokens, representing a notable increase in the amount of text the model can process compared with earlier releases.
- API string
- claude-sonnet-4-5
- Context window
- 200K ctx
- Tier
- Balanced
- Released
- Sep 29, 2025
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.
Report an issue with Claude
Posts to your status feed
Pick the closest match below, edit the body, and post. Your report carries the #claude tag automatically so it surfaces here + in the trending-tags rail. Reporting also follows Claude so you’ll get status updates.
Part of the Claude version timeline. Catch Me Up — everything that changed across AI & smart home ↗