Extracting hidden chain-of-thought from frontier models via custom tool calls
SeaFill2025 · hf · 2026-09-24
By registering a simple custom tool through the standard API, researchers induce frontier models to externalize intermediate reasoning. The extracted traces match native CoT performance and beat no-reasoning baselines across math, science, and code. Characterizing the traces reveals systematic differences: GPT-6 Astra shows token-efficient directed reasoning, resolving elementary steps internally and externalizing only crucial ones.
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