GPT-5.6 Luna (Medium) vs Solar Pro 4
Which is better for the money: GPT-5.6 Luna (Medium) by OpenAI or Solar Pro 4 by Upstage? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-25.
Trade-off
Verdict
Depends on your budget
Solar Pro 4 scores 1.6 points higher (26.6 vs 25.0) but costs 17× as much to run the benchmark ($737 vs $44.3; premium vs budget cost classes). They are not alternatives at one budget: pick Solar Pro 4 when you need intelligence above 25.0, and GPT-5.6 Luna (Medium) when 25.0 is enough.
| Metric | GPT-5.6 Luna (Medium) | Solar Pro 4 | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 25.0 | 26.6 | +6.4% Solar Pro 4 is 6.4% more intelligent |
| Total AA cost (lower is better) | $44.32 | $736.82 | +1562.5% Solar Pro 4 is 17× more expensive |
| End-to-end time (lower is better) | 6.19s | Not reported | — not comparable |
| Price per 1M tokens (in / out) | $0.20 / $1.20 | $0.30 / $1.20 | |
| Input modalities | Text, Image | Text |
Solar Pro 4 vs GPT-5.6 Luna (Medium): 6.4% more intelligence, 1562.5% more cost to run the AA benchmark, and end-to-end time not fully reported.
Today's Pareto frontier
Against the frontier
- GPT-5.6 Luna (Medium) is off the frontier: at the same or lower cost, GPT-6 Luna (Medium) scores 29.90 for $31.2.
- 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 (Medium)Solar Pro 4Today's Pareto frontierEvery other model
Matchup
Compare something else
Agents:
Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/gpt-5-6-luna-medium/solar-pro4 · Markdown: /api/v1/compare/gpt-5-6-luna-medium/solar-pro4?format=md · llms.txt · agent skill