GPT-6 Astra system card: no-CoT time horizon up ~10x over GPT-5.6 Sol, UK AISI finds
scaling01 · x · 2026-09-04
OpenAI's GPT-6 Astra system card includes a striking claim: the no-CoT time horizon "may have increased by about an order of magnitude." UK AISI measured Astra's time horizon at 30.9 minutes versus 3.6 minutes for GPT-5.6 Sol — a key signal of long-horizon task capability gains.
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