Anthropic CEO Dario Amodei has spent much of 2026 cautioning about the existential risks of superhuman AI systems even as his company rolls out increasingly powerful models at a steady clip.
On June 9, 2026, Anthropic launched Claude Fable 5, the first publicly available model in its Mythos class. It arrives with enhanced safeguards designed to blunt the sharper edges of its predecessor, the Claude Mythos Preview, which debuted on April 7-8 and remains locked behind restricted access. The company decided the original Mythos Preview was simply too risky for widespread deployment.
The model too dangerous to ship
Anthropic built the Mythos Preview primarily as a frontier model for cybersecurity. Amodei highlighted its ability to autonomously discover software vulnerabilities, including zero-day exploits. He acknowledged the potential for “destabilizing societal effects” if such a system were widely accessible.
The Mythos Preview was restricted to selected security partners only. No API for developers. No chatbot for consumers. Just a controlled rollout to vetted organizations.
