Anthropic launches Claude Fable 5.1 after inking $35B cloud deal with Lambda

Anthropic PBC today debuted Claude Fable 5.1 and Claude Mythos 5.1, its most capable large language models to date.

The launch comes a day after the company inked a $35 billion infrastructure deal with cloud startup Lambda Inc. A week earlier, Anthropic signed an even larger hardware contract with Nscale Global Holdings Ltd.

Record-setting benchmark results

Fable 5.1 and Mythos 5.1 are effectively the same model. The main difference is that the Fable 5.1 can’t be used for sensitive cybersecurity and biology tasks. Mythos 5.1, which doesn’t block such use cases, will be accessible to only a limited number of trusted organizations.