Anthropic suspends access to Fable 5 and Mythos 5

After launching two advanced models, Anthropic reported an access suspension.

Anthropic launched Claude Fable 5 and Claude Mythos 5 on June 9, then said on June 12 that access to both models was unavailable while it works to restore service.

The episode highlights a growing tension in frontier AI: releasing advanced capabilities quickly while keeping operational controls around sensitive use cases.