Anthropic Releases Fable 5.1 Alongside Restricted Mythos Variant

Anthropic has released Fable 5.1, a new version of its artificial intelligence model, together with a restricted sibling called Mythos 5.1, according to Decrypt. Fable 5.1 reportedly achieved more than twice the performance of its predecessor on a key benchmark, although the source material does not specify the benchmark or scores. The launch comes three months after export controls led Anthropic to take Fable 5 offline for 18 days. The latest release marks the return of the Fable line following that disruption. Mythos 5.1 is being offered as a restricted counterpart to the main model, but no further details about the access limits or technical differences were provided. The announcement is relevant to market participants tracking developments in artificial intelligence and related digital-asset projects, though the supplied information does not indicate any direct effect on MON, ONT, ORE, or RED.