GPT-6 Sol and Luna Halve Prices, Sol Cuts Hallucination Rate from 92% to 60%
ArtificialAnlys · x · 2026-09-23
Artificial Analysis publishes a deep dive on GPT-6 Sol and Luna:
- Pricing halved: Sol drops from $4/$20 to $2/$10 per million tokens; Luna from $0.20/$1.20 to $0.10/$0.50. Cost per task falls 50-60% (Sol $1.06 vs $1.99), pushing the cost-efficiency Pareto frontier.
- Coding Agent Index: Sol scores 57 (+2), with Terminal-Bench 4.0 up from 37% to 43%; Luna regresses 2 points to 41.
- Much less hallucination: Sol's rate falls from 92% to 60% (mainly by answering fewer questions — attempt rate 83% vs 99%, accuracy down 5 points); Luna's from 93% to 77%.
- Mixed regressions: GDPval-AA v2.1 drops 100 Elo for Sol and 75 for Luna; manual inspection attributes regressions to shorter deliverables that omit rubric elements.
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