Claude model versions — full release history
9 versions
- Claude Haiku 5.5 Oct 7, 2026
- Claude Sonnet 5.5 Sep 28, 2026
- Claude Fable 5.1 Sep 1, 2026 · claude-fable-5-1
- Claude Mythos 5.1 Sep 1, 2026 · claude-mythos-5-1
- Claude Fable 5 Aug 1, 2026
- Claude Mythos 5 Aug 1, 2026
- Claude Opus 5 Aug 1, 2026
- Claude Opus 5 Jul 24, 2026
- Claude Sonnet 5 Jun 30, 2026 · claude-sonnet-5