Anthropic has walked back a policy that covertly limited the ability of its new Mythos-tier model, Claude Fable 5, to be used for AI research.
When Anthropic made its first Mythos-tier model available to the general public yesterday, Fortune reported it was a “considerable step” for the lab, coming just over a week after the company confidentially filed for IPO paperwork. It had initially deemed Mythos-class models too dangerous to release, citing their significantly enhanced ability to identify software vulnerabilities, but said it was now confident new guardrails in Claude Fable 5 are enough to ensure these dangerous skills don’t fall into the wrong hands.
