GPT-5.6 Benchmarks and Costs Revealed
iamrobotbear · x · 2026-07-10
Pre-release evaluations from Artificial Analysis show that OpenAI's GPT-5.6 Sol nearly matches Claude Fable 5 on the Artificial Analysis Intelligence Index, but at roughly one-third of the cost.
The same evaluation indicates that GPT-5.6 Terra and Luna scored 55 and 51 respectively, with even lower costs per task; additionally, GPT-5.6 Sol leads the Coding Agent Index within OpenAI's Codex harness.
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