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Adversarial Attacks

59 summarised stories about Adversarial Attacks, each linking back to the original source. Browse all topics →

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Tuesday, 11 August 2026

Stealing Reasoning Traces from Proprietary LLM APIs

Simon Willison’s Weblog 2 months ago 46 ● 3 sources

A paper described how replaying encrypted chain-of-thought (“reasoning”) blocks from proprietary LLM API responses could let attackers recover plaintext hidden reasoning by running the trace across models and then jailbreaking a weaker sibling. The authors said the easiest target was Claude Haiku 4.5, where a removed feature in 4.6 had still allowed an assistant prefix to work. Providers acknowledged the report and the authors could no longer run the same attacks after the fix.

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