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

GPT-6.1 Sol has replaced GPT-6 Sol after only seven days, achieving near-Astra intelligence. It scores just one point below GPT-6 Astra in the Intelligence Index, yet at less than one-quarter of the Cost per Task. This new model shows significant improvements, gaining 4 points in the Intelligence Index compared to GPT-6 Sol and 5 points versus GPT-5.6 Sol. Notable gains include a 12-point jump in Terminal-Bench 4.0 and an 8-point jump in AA-Omniscience Accuracy, with its hallucination rate falling from 60% to 54%.