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Over the last week, internet giants and security researchers who got early access to Anthropic’s Mythos model released assessments of the powerful AI. They generally agreed that the model, alongside OpenAI’s GPT 5.5, is a major advance in finding software vulnerabilities. Not only do both models find more bugs, but they also complete cybersecurity tasks significantly faster than previous models (and humans).

But Mythos users have warnings too. Grant Bourzikas, chief information security officer at Cloudflare, the $70 billion market cap internet security company, wrote in a blog that when Mythos suggested patches for vulnerabilities, if applied, they would have quietly broken something the code relied on, causing a potential crash or another weakness for a hacker to exploit. Though companies with strong security checks should be........

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