Armin Ronacher 8/19/2026

What Is Reasoning

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Armin Ronacher explores the concept of reasoning traces in AI models, explaining that they are just text generated into a scratchpad before the final answer. He discusses how reasoning effort is controlled via system prompts rather than sampling properties, and how models are trained to keep reasoning hidden. The article also covers techniques to extract or leak these traces, and the implications for model transparency and safety.

What Is Reasoning

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