GPT-5.5-Cyber Beats Mythos 5 on CyberGym - Memeburn
Summary
OpenAI’s GPT-5.5-Cyber reportedly outscored Anthropic’s Mythos 5 on the CyberGym benchmark, a test built at UC Berkeley to measure whether AI can reproduce known software vulnerabilities in real code. The article emphasizes that both models are aimed at serious security work such as vulnerability discovery, code analysis, and patch support. It also notes that GPT-5.5-Cyber is only available to a limited group of verified users, so access and deployment terms matter as much as benchmark performance. The key takeaway is that the race is tight and real-world integration into security workflows will determine practical value.
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