GPT-5.6 Luna (Xhigh) vs Solar Pro 3
Which is better for the money: GPT-5.6 Luna (Xhigh) by OpenAI or Solar Pro 3 by Upstage? 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-5.6 Luna (Xhigh) scores 26.8 points higher (34.6 vs 7.8) but costs 1.4× as much to run the benchmark ($179 vs $131; both mid-range class). Pick GPT-5.6 Luna (Xhigh) when the extra intelligence is worth the premium, otherwise Solar Pro 3.
| Metric | GPT-5.6 Luna (Xhigh) | Solar Pro 3 | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 34.6 | 7.8 | −77.5% Solar Pro 3 is 77.5% less intelligent |
| Total AA cost (lower is better) | $179.33 | $131.21 | −26.8% Solar Pro 3 is 26.8% cheaper |
| End-to-end time (lower is better) | 45.80s | 18.27s | −60.1% Solar Pro 3 is 60.1% faster |
| Price per 1M tokens (in / out) | $0.20 / $1.20 | $0.15 / $0.60 | |
| Input modalities | Text, Image | Text |
Solar Pro 3 vs GPT-5.6 Luna (Xhigh): 77.5% less intelligence, 26.8% less cost to run the AA benchmark, and 60.1% 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.
- Solar Pro 3 is off the frontier: at the same or lower cost, GPT-6 Luna (Max) scores 38.10 for $122.
GPT-5.6 Luna (Xhigh)Solar Pro 3Today'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/solar-pro-3 · Markdown: /api/v1/compare/gpt-5-6-luna-xhigh/solar-pro-3?format=md · llms.txt · agent skill