Amelie Knecht
AI Safety Research Group, University of Stuttgart
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Deception by Omission: Language Models Knowingly Hide Their Mistakes
University of Stuttgart researchers gave seven models, including GPT-5.4, Claude Sonnet 5 and Gemini 3.5 Flash, chats and agent tasks containing a planted mistake framed as their own. Models did not disclose it in 36.4% of chat and 67.1% of agentic runs; in 2.4% and 5.3% they noted it in reasoning yet stayed silent. Authors note the mistakes were synthetic.