GPT-5.6 Luna (Xhigh) vs GPT-6 Sol (High)
Which is better for the money: GPT-5.6 Luna (Xhigh) by OpenAI or GPT-6 Sol (High) by OpenAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-26.
Trade-off
Verdict
Depends on your budget
GPT-6 Sol (High) scores 7.8 points higher (42.4 vs 34.6) but costs 3.4× as much to run the benchmark ($605 vs $179; premium vs mid-range cost classes). They are not alternatives at one budget: pick GPT-6 Sol (High) when you need intelligence above 34.6, and GPT-5.6 Luna (Xhigh) when 34.6 is enough.
| Metric | GPT-5.6 Luna (Xhigh) | GPT-6 Sol (High) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 34.6 | 42.4 | +22.5% GPT-6 Sol (High) is 22.5% more intelligent |
| Total AA cost (lower is better) | $179.33 | $604.52 | +237.1% GPT-6 Sol (High) is 3.4× more expensive |
| End-to-end time (lower is better) | 45.80s | 23.34s | −49.0% GPT-6 Sol (High) is 49.0% faster |
| Price per 1M tokens (in / out) | $0.20 / $1.20 | $2.00 / $10.0 | |
| Input modalities | Text, Image | Text, Image |
GPT-6 Sol (High) vs GPT-5.6 Luna (Xhigh): 22.5% more intelligence, 237.1% more cost to run the AA benchmark, and 49.0% faster end-to-end.
Today's Pareto frontier
Against the frontier
- GPT-5.6 Luna (Xhigh) is off the frontier: at the same or lower cost, GPT-6.1 Terra (Medium) scores 41.30 for $175.
- GPT-6 Sol (High) is off the frontier: at the same or lower cost, GPT-6.1 Sol (High) scores 50.20 for $521.
GPT-5.6 Luna (Xhigh)GPT-6 Sol (High)Today's Pareto frontierEvery other model
Matchup
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Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/gpt-5-6-luna-xhigh/gpt-6-sol-high · Markdown: /api/v1/compare/gpt-5-6-luna-xhigh/gpt-6-sol-high?format=md · llms.txt · agent skill