Fable

Anthropic released Fable 5.1 and Mythos 5.1 on Tuesday, twinned models with reduced token costs and fewer false-positive safeguard triggers. Mythos remains restricted to cybersecurity and life sciences partners, while Fable is available now via cloud platforms and the Anthropic API.

The US government has removed export restrictions on Anthropic's Mythos and Fable models, ending a ban that forced the company to cut off public access on June 12. Anthropic will begin restoring access on July 1 after agreeing to proactively detect security risks and coordinate with the US government on protocols for current and future model releases.