Anthropic’s new Fable release is cheaper, less restrictive

Fable 5.1 includes changes meant to reduce token cost and false-positive restrictions from the model's safeguards.

Opus 5 will be both cheaper and less restrictive than Fable, likely making it preferable in most use cases.

Anthropic says its newest AI models, Fable 5.1 and Mythos 5.1, address criticisms from customers about price, data retention, and overzealous safeguards. The company claims Claude

Opus 5 will be both cheaper and less restrictive than Fable, likely making it preferable in most use cases

Anthropic called it "the strongest-performing model we've tested to date."

Anthropic releases Opus 5 with ‘close’ to Fable 5’s capabilities