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OpenAI Compaction Flaw Let Researchers Bypass Hidden Reasoning Protections

The Hacker News · WORLD · Security · 10/27/2026, 4:22:43 AM

OpenAI's compaction feature, which shrinks a long conversation to save space, could be turned into a way to copy a model's hidden reasoning out in plain text, security firm Xint has shown. OpenAI's reasoning models work through a problem before answering, and the service normally returns only the raw reasoning as an encrypted item the user cannot read. The method got past

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