GPT-6.1 Sol costs a quarter of GPT-6 Astra per task, pushing OpenAI's cost-efficiency frontier
ArtificialAnlys · x · 2026-10-01
Artificial Analysis reports GPT-6.1 Sol pushes out the cost-efficiency Pareto frontier for OpenAI models: at max effort it costs $0.72 per Intelligence Index task—less than a quarter of GPT-6 Astra ($3.26), 31% less than GPT-6 Sol ($1.04), and 64% less than GPT-5.6 Sol ($1.99). All effort levels offer no cheaper option at a given intelligence level. OpenAI also fixed an image-encoding bug: GPT-6 Luna (max) gained 1 point on the Intelligence Index, with big eval gains like MMMU-Pro (+4.1pt) and GDPval-AA v2.1 (+71 Elo); GPT-6 Sol saw negligible improvement.
Related event: GPT-6.1 Sol Pushes OpenAI's Cost-Efficiency Frontier(3 posts)→
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