Gemini 3.5 Flash (High) vs GPT-5.6 Luna (High)
Which is better for the money: Gemini 3.5 Flash (High) by Google or GPT-5.6 Luna (High) 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
Gemini 3.5 Flash (High) scores 0.5 points higher (32.6 vs 32.1) but costs 39× as much to run the benchmark ($4222 vs $108; flagship vs mid-range cost classes). They are not alternatives at one budget: pick Gemini 3.5 Flash (High) when you need intelligence above 32.1, and GPT-5.6 Luna (High) when 32.1 is enough.
| Metric | Gemini 3.5 Flash (High) | GPT-5.6 Luna (High) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 32.6 | 32.1 | −1.5% GPT-5.6 Luna (High) is 1.5% less intelligent |
| Total AA cost (lower is better) | $4,222.12 | $108.15 | −97.4% GPT-5.6 Luna (High) is 97.4% cheaper |
| End-to-end time (lower is better) | 16.71s | 13.41s | −19.7% GPT-5.6 Luna (High) is 19.7% faster |
| Price per 1M tokens (in / out) | $1.50 / $9.00 | $0.20 / $1.20 | |
| Input modalities | Text, Image, Speech, Video | Text, Image |
GPT-5.6 Luna (High) vs Gemini 3.5 Flash (High): 1.5% less intelligence, 97.4% less cost to run the AA benchmark, and 19.7% faster end-to-end.
Today's Pareto frontier
Against the frontier
- Gemini 3.5 Flash (High) is off the frontier: at the same or lower cost, Claude Opus 5.5 (Xhigh, Default Fallback) scores 56.00 for $4057.
- GPT-5.6 Luna (High) is off the frontier: at the same or lower cost, Claude Haiku 5.5 (High) scores 37.80 for $94.1.
Gemini 3.5 Flash (High)GPT-5.6 Luna (High)Today'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/gemini-3-5-flash/gpt-5-6-luna-high · Markdown: /api/v1/compare/gemini-3-5-flash/gpt-5-6-luna-high?format=md · llms.txt · agent skill