GPT-6.1 Sol replaces GPT-6 Sol after just 7 days, with near-Astra intelligence

September 29, 2026 GPT-6.1 Sol replaces GPT-6 Sol after just 7 days, with near-Astra intelligence See model pageGPT-6.1 Sol replaces GPT-6 Sol after just 7 days. It scores 1 point below GPT-6 Astra in the Intelligence Index at less than one quarter of the Cost per Task. Pricing matches GPT-6 Sol at $2/$10 per million input/output tokens, except that the cache read discount rises from 90% to 95%. G...