GPT-6 Sol vs Sonnet 5.5 at equal cost: Sol wins per dollar, Sonnet 5.5 has the higher ceiling
AMBNNJ · reddit · 2026-09-29
A Reddit user plotted Artificial Analysis Intelligence Index scores against cost per task for GPT-6 Sol and Sonnet 5.5 (both $2/$10 per M tokens):
- $0.55/task: Sol xhigh 44 vs Sonnet 5.5 medium 41
- $1.07/task: Sol max 48 vs Sonnet 5.5 high 47
- Beyond that Sol has no higher setting; Sonnet 5.5 hits 52 at xhigh ($2.74) and 56 at max ($7.60), though the top-end lead mostly comes from burning 7× more tokens for +9 points
On Terminal-Bench 4.0 (max effort) Sonnet 5.5 leads 63.6% to Sol's 43%. Caveat: Sonnet 5.5 launched today; the xhigh point comes from a third-party write-up of AA data.
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