GPT-5.6 Luna (Low) vs GPT-6 Luna (High)
Which is better for the money: GPT-5.6 Luna (Low) by OpenAI or GPT-6 Luna (High) 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 Luna (High) scores 11.9 points higher (32.9 vs 21.0) but costs 1.8× as much to run the benchmark ($47.9 vs $27.0; both budget class). Pick GPT-6 Luna (High) when the extra intelligence is worth the premium, otherwise GPT-5.6 Luna (Low).
| Metric | GPT-5.6 Luna (Low) | GPT-6 Luna (High) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 21.0 | 32.9 | +56.7% GPT-6 Luna (High) is 56.7% more intelligent |
| Total AA cost (lower is better) | $27.02 | $47.85 | +77.1% GPT-6 Luna (High) is 77.1% more expensive |
| End-to-end time (lower is better) | 5.68s | 21.41s | +276.9% GPT-6 Luna (High) is 276.9% slower |
| Price per 1M tokens (in / out) | $0.20 / $1.20 | $0.10 / $0.50 | |
| Input modalities | Text, Image | Text, Image |
GPT-6 Luna (High) vs GPT-5.6 Luna (Low): 56.7% more intelligence, 77.1% more cost to run the AA benchmark, and 276.9% slower end-to-end.
Today's Pareto frontier
Against the frontier
- GPT-5.6 Luna (Low) is off the frontier: at the same or lower cost, GPT-6 Luna (Low) scores 21.50 for $10.6.
- GPT-6 Luna (High) is on today's frontier: nothing is both smarter and cheaper.
GPT-5.6 Luna (Low)GPT-6 Luna (High)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-low/gpt-6-luna-high · Markdown: /api/v1/compare/gpt-5-6-luna-low/gpt-6-luna-high?format=md · llms.txt · agent skill