Opus 5.5 still leads on intelligence, but GPT-6.1 Sol shifts the cost frontier
rhiever · reddit · 2026-09-30
Based on Artificial Analysis data, a Reddit user compares Opus 5.5 and GPT-6.1 Sol:
- Opus 5.5 still leads on Artificial Analysis's Intelligence Index
- GPT-6.1 Sol shifts the cost frontier, coming out cheaper on cost per benchmark task
- The chart covers different reasoning-effort settings; costs include caching and reasoning tokens, not subscription prices
Source: artificialanalysis.ai
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