GPT-5.6 Luna (Xhigh) vs GPT-5.6 Sol (High)
Which is better for the money: GPT-5.6 Luna (Xhigh) by OpenAI or GPT-5.6 Sol (High) by OpenAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-27.
Trade-off
Verdict
Depends on your budget
GPT-5.6 Sol (High) scores 7.7 points higher (42.3 vs 34.6) but costs 8.3× as much to run the benchmark ($1487 vs $179; premium vs mid-range cost classes). They are not alternatives at one budget: pick GPT-5.6 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-5.6 Sol (High) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 34.6 | 42.3 | +22.3% GPT-5.6 Sol (High) is 22.3% more intelligent |
| Total AA cost (lower is better) | $179.33 | $1,487.34 | +729.4% GPT-5.6 Sol (High) is 8.3× more expensive |
| End-to-end time (lower is better) | 39.18s | 16.35s | −58.3% GPT-5.6 Sol (High) is 58.3% faster |
| Price per 1M tokens (in / out) | $0.20 / $1.20 | $4.00 / $20.0 | |
| Input modalities | Text, Image | Text, Image |
GPT-5.6 Sol (High) vs GPT-5.6 Luna (Xhigh): 22.3% more intelligence, 729.4% more cost to run the AA benchmark, and 58.3% 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-5.6 Sol (High) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
GPT-5.6 Luna (Xhigh)GPT-5.6 Sol (High)Today's Pareto frontierEvery other model
Matchup
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