GPT-5.5 (Medium) vs GPT-5.6 Luna (Max)
Which is better for the money: GPT-5.5 (Medium) by OpenAI or GPT-5.6 Luna (Max) by OpenAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-24.
Clear winner
Verdict
Pick GPT-5.6 Luna (Max)
GPT-5.6 Luna (Max) vs GPT-5.5 (Medium): 10.4% more intelligence, 84.7% less cost to run the AA benchmark, and 777.5% slower end-to-end.
| Metric | GPT-5.5 (Medium) | GPT-5.6 Luna (Max) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 33.8 | 37.3 | +10.4% GPT-5.6 Luna (Max) is 10.4% more intelligent |
| Total AA cost (lower is better) | $2,095.12 | $319.93 | −84.7% GPT-5.6 Luna (Max) is 84.7% cheaper |
| End-to-end time (lower is better) | 9.73s | 85.38s | +777.5% GPT-5.6 Luna (Max) is 777.5% slower |
| Price per 1M tokens (in / out) | $5.00 / $30.0 | $0.20 / $1.20 | |
| Input modalities | Text, Image | Text, Image |
Today's Pareto frontier
Against the frontier
- GPT-5.5 (Medium) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
- GPT-5.6 Luna (Max) is off the frontier: at the same or lower cost, MiMo-V2.6-Pro scores 46.30 for $207.
GPT-5.5 (Medium)GPT-5.6 Luna (Max)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-5-5-medium/gpt-5-6-luna · Markdown: /api/v1/compare/gpt-5-5-medium/gpt-5-6-luna?format=md · llms.txt · agent skill