Claude Mythos 5 released to partners only—is 'safe' Claude Fable 5 just a downgrade?
anthropic released claude mythos 5 to partners and claude fable 5 to the public, but the public version redirects dangerous queries to an older model, restricting its capabilities to prevent cyberattacks.
anthropic launched claude mythos 5, offering the full model to industry partners and government collaborators under project glasswing while restricting the public claude fable 5. fable 5 automatically reroutes prompts involving cybersecurity, biology, chemistry, or model distillation to the older claude opus 4.8 to prevent exploitation. anthropic stated this cautious approach was necessary to safely release the model broadly, noting competitors will inevitably match mythos-level capabilities soon.