GPT-5.5 (High) vs GPT-6 Luna (Non-reasoning)
Which is better for the money: GPT-5.5 (High) by OpenAI or GPT-6 Luna (Non-reasoning) by OpenAI? 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-5.5 (High) scores 18.5 points higher (37.0 vs 18.5) but costs 166× as much to run the benchmark ($3181 vs $19.2; flagship vs budget cost classes). They are not alternatives at one budget: pick GPT-5.5 (High) when you need intelligence above 18.5, and GPT-6 Luna (Non-reasoning) when 18.5 is enough.
| Metric | GPT-5.5 (High) | GPT-6 Luna (Non-reasoning) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 37.0 | 18.5 | −50.0% GPT-6 Luna (Non-reaso… is 50.0% less intelligent |
| Total AA cost (lower is better) | $3,181.05 | $19.16 | −99.4% GPT-6 Luna (Non-reaso… is 99.4% cheaper |
| End-to-end time (lower is better) | 39.78s | 5.06s | −87.3% GPT-6 Luna (Non-reaso… is 87.3% faster |
| Price per 1M tokens (in / out) | $5.00 / $30.0 | $0.10 / $0.50 | |
| Input modalities | Text, Image | Text, Image |
GPT-6 Luna (Non-reasoning) vs GPT-5.5 (High): 50.0% less intelligence, 99.4% less cost to run the AA benchmark, and 87.3% faster end-to-end.
Today's Pareto frontier
Against the frontier
- GPT-5.5 (High) is off the frontier: at the same or lower cost, Kimi K3.1 Pro scores 55.10 for $3117.
- GPT-6 Luna (Non-reasoning) is off the frontier: at the same or lower cost, GPT-6 Luna (Low) scores 21.50 for $10.6.
GPT-5.5 (High)GPT-6 Luna (Non-reasoning)Today's Pareto frontierEvery other model
Matchup
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