Simon Willison 7/12/2026

Fable gets another bump

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This article discusses Anthropic's decision to extend the availability of their Fable/Mythos class model, Claude Fable 5, on paid plans due to compute constraints and demand uncertainty. Meanwhile, OpenAI's GPT-5.6 Sol remains unrestricted, with updates including removal of usage limits and efficiency improvements. The author suggests Anthropic should make Fable permanently available to compete with OpenAI's growing user base.

Fable gets another bump

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