FeaturesNew 2026-05
Model lineup
Released in this order: Opus 4.8 (5/28), Fable 5 (6/9), Sonnet 5 (6/30), Opus 5 (7/24), Fable 5.1 and Mythos 5.1 (9/1), Opus 5.5 (9/22), Sonnet 5.5 (9/28), Haiku 5.5 (10/7).
Usage
/model
When to use it
When you are choosing a model.
Source: https://support.claude.com/en/articles/12138966-release-notes
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