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OpenAI says new GPT-5.5-Cyber outperforms Anthropic's Mythos on cybersecurity benchmark

OpenAI's GPT-5.5-Cyber model achieves state-of-the-art results on cybersecurity benchmarks, surpassing Anthropic's Mythos. This updated model, part of the Daybreak initiative, focuses on automated vulnerability patching rather than just detection.

The Decoder·Jun 23, 2026

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