Cybersecurity Looks Like Proof of Work Now

The detail that performance scales with computational investment reframes Claude Mythos less as a specialized model and more as a proof-of-work system, where security outcomes are essentially purchasable at scale. That has pricing and access implications Anthropic hasn't addressed publicly.

This lands in the middle of a direct race between Anthropic and OpenAI for cybersecurity credibility. OpenAI launched GPT-5.4-Cyber and its Trusted Access for Cyber program around the same window (covered here from the April 14 and 16 OpenAI pieces), pairing model access with $10M in grants to vetted security firms. Anthropic's counter is independent verification from the UK AI Safety Institute rather than a grants program, which is a notably different strategy: credibility through third-party validation rather than ecosystem incentives. The Verge's piece on Claude Mythos and government relations adds another layer, suggesting the cybersecurity push is also doing diplomatic work with the Trump administration after a period of friction.

Watch whether OpenAI responds with its own independent third-party evaluation of GPT-5.4-Cyber within the next 60 days. If it does, the UK AI Safety Institute's imprimatur becomes a competitive baseline rather than a differentiator.