Anthropic releases Claude Fable 5.2 and Mythos 5.2
On 9 November 2026 Anthropic announced Claude Fable 5.2 and Claude Mythos 5.2. Fable 5.2 succeeds Fable 5.1 and is available through Claude apps, Claude Code and cloud platforms; Mythos 5.2 is limited to vetted organizations.