---
title: "OpenAI Compaction Flaw Let Researchers Bypass Hidden Reasoning Protections"
type: signal
url: https://frontiernewswire.com/s/openai-compaction-flaw-let-researchers-bypass-hidden-reasoning-9f53a537
published: 2026-10-27T08:22:43.000Z
byline: "Source: The Hacker News"
---

# OpenAI Compaction Flaw Let Researchers Bypass Hidden Reasoning Protections

Source: The Hacker News · Published 2026-10-27 · Canonical: https://frontiernewswire.com/s/openai-compaction-flaw-let-researchers-bypass-hidden-reasoning-9f53a537

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

## Sources

- [Read the original at The Hacker News](https://thehackernews.com/2026/10/openai-compaction-flaw-let-researchers.html)

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