Anthropic says Fable 5.1 will cost an estimated 25% less than Fable 5 for typical workloads and up to 45% less for highly agentic work (Rachel Metz/Bloomberg)

Anthropic is releasing a new version of its artificial intelligence model, Fable 5.1. According to the company, this model is better at coding and science tasks compared to its predecessor, Fable 5.

Fable 5.1 is said to have a higher level of performance than Fable 5 and achieves similar or better results at a lower cost. Anthropic estimates that Fable 5.1 will cost 25% less than Fable 5 for typical workloads and up to 45% less for highly agentic work, as reported by Bloomberg.

The new model is also capable of fixing the root causes of software issues and avoids shortcuts that result in poorer-quality work. Additionally, Anthropic is releasing Mythos 5.1, which is the same model as Fable 5.1 but with different levels of safeguards, for users with Mythos access.

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