GPT-5.6 Luna (Xhigh) vs Solar Pro 4
Which is better for the money: GPT-5.6 Luna (Xhigh) by OpenAI or Solar Pro 4 by Upstage? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-26.
Clear winner
Verdict
Pick GPT-5.6 Luna (Xhigh)
Solar Pro 4 vs GPT-5.6 Luna (Xhigh): 23.1% less intelligence, 310.9% more cost to run the AA benchmark, and end-to-end time not fully reported.
| Metric | GPT-5.6 Luna (Xhigh) | Solar Pro 4 | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 34.6 | 26.6 | −23.1% Solar Pro 4 is 23.1% less intelligent |
| Total AA cost (lower is better) | $179.33 | $736.82 | +310.9% Solar Pro 4 is 4.1× more expensive |
| End-to-end time (lower is better) | 40.39s | Not reported | — not comparable |
| Price per 1M tokens (in / out) | $0.20 / $1.20 | $0.30 / $1.20 | |
| Input modalities | Text, Image | Text |
Today's Pareto frontier
Against the frontier
- GPT-5.6 Luna (Xhigh) is off the frontier: at the same or lower cost, Claude Haiku 5.5 (Xhigh) scores 41.20 for $158.
- Solar Pro 4 is off the frontier: at the same or lower cost, GPT-6.1 Sol (Xhigh) scores 51.00 for $662.
GPT-5.6 Luna (Xhigh)Solar Pro 4Today's Pareto frontierEvery other model
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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-pro4 · Markdown: /api/v1/compare/gpt-5-6-luna-xhigh/solar-pro4?format=md · llms.txt · agent skill