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Opus 5.5 still leads on AA intelligence, but GPT-6.1 Sol shifts the cost frontier

This story is from 2026-09-29. It is preserved in the archive; the latest stories are on the live feed.

This compares reasoning effort settings using Artificial Analysis's Intelligence Index and cost per benchmark task. Costs include caching and reasoning; they aren't subscription prices. Data source: https://artificialanalysis.ai/

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  1. 2026-09-29 20:11 · r/ClaudeAI
    Opus 5.5 still leads on AA intelligence, but GPT-6.1 Sol shifts the cost frontier

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