AnalysisCybersecurityOctober 27, 2026

Xint bypassed OpenAI reasoning protections via compaction flaw

Read original source →thehackernews.com

Xint smuggled encrypted reasoning out of gpt-5.6-sol by having the compaction step copy it verbatim with spaces swapped for tabs, then replaying it into gpt-4.1 and gpt-4o, which repeated it in plain text. OpenAI confirmed and fixed the issue on October 23, per Xint.

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