product · fact
Claude Sonnet 4.5 release date
As of November 4, 2026, the AsOf record says Claude Sonnet 4.5 was released on September 29, 2025, from a primary source (platform.claude.com). The record holds 1 claim on Claude Sonnet 4.5's release, 1 still open and 0 superseded, each dated and sourced; a replaced value is closed with an end date, never deleted.
- current release date
- Claude Sonnet 4.5
Every dated value
| value | valid from | valid to | status | conf | sources | claim |
|---|---|---|---|---|---|---|
| Claude Sonnet 4.5 | 2025-09-29 | valid | 1 source for release date Claude Sonnet 4.5 | clm_5B3CB4F2F885 |
Questions this record answers
- When was Claude Sonnet 4.5 released?