GPT-6.1 Sol and Sonnet 5.5 reshape cost-performance frontier
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OpenAI priced GPT-6.1 Sol at $2/$10 per million input/output tokens versus $10/$50 for Astra, claiming it beats GPT-6 Sol by 6.4 points on DeepSWE v1.1. Sonnet 5.5 debuted at #3 on Agent Arena (+12.5%) and #1 in Chat, but its $2.74 per task keeps it off the Pareto frontier.
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