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OpenAI Compaction Flaw Let Researchers Bypass Hidden Reasoning Protections

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OpenAI Compaction Flaw Let Researchers Bypass Hidden Reasoning Protections

OpenAI's compaction feature, which condenses long conversations to save space, could be exploited to extract hidden reasoning from reasoning models in plain text, according to security research by Xint. The service normally encrypts reasoning output to prevent user access, but the compaction mechanism bypassed this protection.

Why it matters: Organizations using OpenAI's reasoning models need to understand that conversation compression may inadvertently expose protected model internals, affecting data confidentiality and compliance posture.

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Correction recorded as of .

ai security

OpenAI Compaction Flaw Let Researchers Bypass Hidden Reasoning Protections

OpenAI's compaction feature, which condenses long conversations to save space, could be exploited to extract hidden reasoning from reasoning models in plain text, according to security research by Xint. The service normally encrypts reasoning output to prevent user access, but the compaction mechanism bypassed this protection.

Why it matters: Organizations using OpenAI's reasoning models need to understand that conversation compression may inadvertently expose protected model internals, affecting data confidentiality and compliance posture.

Source published
First seen by Cybersecurity Tracker

Source attribution

Glossary