GPT-5.5-Cyber partly stronger than Claude Mythos, but there is no ban
Summary
OpenAI has launched GPT-5.5-Cyber, a cyber-focused model aimed at verified security professionals rather than the general public. The model is designed to analyze large codebases, validate vulnerabilities in controlled environments, and help teams develop and test patches faster. OpenAI also positions the release inside its Daybreak Cyber Partner Program, which lets security vendors integrate the model into their products while keeping direct model access with partners. The article highlights competitive tension with Anthropic and notes that OpenAI has coordinated access controls with U.S. authorities. It also points to a broader ecosystem play through government partnerships and initiatives like Patch the Planet.
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