Extracting Hidden Chain-of-Thought from Frontier Models via Tool Use
September 21, 2026
Researchers demonstrated that frontier models like GPT-6 Astra can be induced to externalize hidden reasoning traces by registering a custom tool via API. Extracted traces match native CoT performance across mathematics, science, and coding benchmarks.
HOW THIS AFFECTS YOU
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builderYou can attempt to intercept intermediate reasoning steps for better observability in production agent workflows.
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researcherYou can use tool-based induction to audit the genuine reasoning capabilities of closed-source models.