GPT-6.1 Sol nearly matches the no-CoT performance of GPT-6 Astra

SummaryI ran GPT-6 Sol and GPT-6.1 Sol on the task suite from Think Fast. Surprisingly, 6.1 Sol performs substantially better than 6 Sol, almost matching the performance of GPT-6 Astra. The plot below gives a quick overview of the results:Measured by mean accuracy across the 27 tasks, GPT-6.1 Sol closes 80% (95% CI: 72–87%) of the gap between GPT-6 Sol and GPT-6 Astra, and is closer to Astra than to GPT-6 Sol on 24 of 27 tasks.The likely reason behind this gap is that, like GPT-6 Astra and unlik...