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Security researchers found that Anthropic’s new Mythos AI model was reachable by unauthorized users through exposed API endpoints. This lapse could expose sensitive prompts and responses, prompting Anthropic to investigate and strengthen its access controls.
- Anthropic's Mythos AI model was accessed by unauthorized users after API keys leaked onto public Slack channels
- Anthropic rotated all impacted keys, shut down mismatched sessions, and tightened authentication after detecting unusual traffic
- The company hasn't disclosed how many keys leaked or how many unauthorized calls were made
- Some enterprise customers paused rollouts pending clearer safeguards on key security