Anthropic models

Claude model family. Publishes a model lifecycle with active, legacy, deprecated, and retired states, and commits to at least 60 days of notice before retiring a publicly released model.

• Claude Fable 5.1active
• Claude Opus 5.5active
• Claude Haiku 5.5active
• Claude Opus 5legacy
• Claude Sonnet 5.5active
• Claude Sonnet 5legacy
• Claude Haiku 4.5legacy
• Claude Fable 5legacy
• Claude Opus 4.8legacy
• Claude Opus 4.7legacy
• Claude Opus 4.6legacy
• Claude Opus 4.5legacy
• Claude Sonnet 4.6legacy
• Claude Sonnet 4.5archived
• Claude Opus 4.1retired, archived
• Claude Opus 4retired, archived
• Claude Sonnet 4retired, archived
• Claude Sonnet 3.7retired, archived
• Claude Haiku 3.5retired, archived
• Claude Haiku 3retired, archived

Every fact on these pages is dated and links to a page Anthropic publishes itself.