OpenAI Says New GPT-5.5-Cyber Outperforms Anthropic's Mythos on Cybersecurity Benchmark
OpenAI said the model outperformed GPT-5.5 on CyberGym, ExploitGym and SEC-bench as it adds tools for finding and patching vulnerabilities.
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White House quiet on OpenAI's Mythos-like model
OpenAI rolled out a cybersecurity model that rivals the capabilities of Mythos — without nearly as much fanfare or political pushback as Anthropic received. Why it matters: The seemingly straightforward model release raises questions about what actually triggered the Trump administration's concerns about Anthropic's Fable 5 and Mythos 5. Catch up quick: OpenAI debuted an update to GPT-5.5-Cyber on Monday as part of a slew of announcements aimed …
With a security initiative, OpenAI competes with Anthropic's myth and also offers a security review service for open source projects.
OpenAI says new GPT-5.5-Cyber outperforms Anthropic's Mythos on cybersecurity benchmark
OpenAI is expanding its Daybreak cybersecurity initiative with an updated Codex Security plugin, the full GPT-5.5-Cyber model, and a partner network with more than 25 security firms and several governments. The focus shifts from finding vulnerabilities to patching them automatically. The article OpenAI says new GPT-5.5-Cyber outperforms Anthropic's Mythos on cybersecurity benchmark appeared first on The Decoder.
The now released full version of OpenAI's latest security model GPT-5.5 Cyber is intended to leave behind the corresponding model Myth 5 by Anthropic, which was only made available to selected partners because otherwise it would be too dangerous, and which the US government recently banned. The model reached a new benchmark of 85.6 percent in the Benchmark CyberGym.
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