Fable 5.1 is now generally available, while Mythos 5.1 is only available through Anthropic’s ‘trusted access’ programmes.

Anthropic has launched the latest iterations of Claude Fable and Claude Mythos – “the world’s most advanced models for coding and knowledge work”, according to the company.

The AI giant said in a press release that Fable 5.1 and Mythos 5.1 are “the same model, but with different levels of safeguards”.

Fable 5.1 is now generally available, while Mythos 5.1 is only available through Anthropic’s “trusted access” programmes – Mythos’s safeguards are specifically designed to support work in cybersecurity and the life sciences, according to the release.

The company said that Fable 5.1 is capable of much higher performance than its predecessor and that even when set to medium or low effort, it can achieve similar or better results than Fable 5.