Fable 5.1 restricts mid-conversation model switches

KyleBoas_ · x · 2026-09-02

Fable 5.1 introduces inference restrictions that prevent mid-conversation model switches, which causes the loss of all reasoning context. The restriction currently applies only to new organizations.

Related event: Anthropic's Fable 5.1 Preserved Thinking locks reasoning context mid-conversation(6 posts)→

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