GPT-5.6 Luna (Xhigh) vs GPT-6.1 Sol (Low)
Which is better for the money: GPT-5.6 Luna (Xhigh) by OpenAI or GPT-6.1 Sol (Low) 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-6.1 Sol (Low) scores 7.5 points higher (42.1 vs 34.6) but costs 1.4× as much to run the benchmark ($250 vs $179; both mid-range class). Pick GPT-6.1 Sol (Low) when the extra intelligence is worth the premium, otherwise GPT-5.6 Luna (Xhigh).
| Metric | GPT-5.6 Luna (Xhigh) | GPT-6.1 Sol (Low) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 34.6 | 42.1 | +21.7% GPT-6.1 Sol (Low) is 21.7% more intelligent |
| Total AA cost (lower is better) | $179.33 | $250.48 | +39.7% GPT-6.1 Sol (Low) is 39.7% more expensive |
| End-to-end time (lower is better) | 45.86s | 11.86s | −74.1% GPT-6.1 Sol (Low) is 74.1% faster |
| Price per 1M tokens (in / out) | $0.20 / $1.20 | $2.00 / $10.0 | |
| Input modalities | Text, Image | Text, Image |
GPT-6.1 Sol (Low) vs GPT-5.6 Luna (Xhigh): 21.7% more intelligence, 39.7% more cost to run the AA benchmark, and 74.1% 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-6.1 Sol (Low) is off the frontier: at the same or lower cost, MiMo-V2.6-Pro scores 46.30 for $207.
GPT-5.6 Luna (Xhigh)GPT-6.1 Sol (Low)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-6-1-sol-low · Markdown: /api/v1/compare/gpt-5-6-luna-xhigh/gpt-6-1-sol-low?format=md · llms.txt · agent skill