Claude Fable 5 launches with strict guardrails

Simon Willison's Weblog

Priced at $10/M input and $50/M output tokens, double Opus 4.5-4.8. Offers same performance as Claude Mythos 5 but with strict safety classifiers that can trigger automatic fallback to another model.

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Wrote up my initial impressions of Claude Fable 5 - it has a big model smell: slow, expensive and ca...10 days agoSimon Willison

Simon Willison's Weblog·Simon Willison

Jun 9, 11:59 PM