OpenAI Launches Full-Scale Effort to Patch Open Source Bugs as It Takes on Anthropic’s Mythos

Amid concerns about AI models’ cybersecurity capabilities, OpenAI revealed an improved version of GPT-5.5-Cyber and its “Patch the Plant” initiative to fix open source software bugs.

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Covers 2 stories including System Card: Claude Fable 5 and Claude Mythos 5 [pdf]

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