Gemini 4 Argon (High) vs GPT-5.6 Luna (Medium)
Which is better for the money: Gemini 4 Argon (High) by Google or GPT-5.6 Luna (Medium) 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 4 Argon (High) scores 27.6 points higher (52.6 vs 25.0) but costs 54× as much to run the benchmark ($2407 vs $44.3; flagship vs budget cost classes). They are not alternatives at one budget: pick Gemini 4 Argon (High) when you need intelligence above 25.0, and GPT-5.6 Luna (Medium) when 25.0 is enough.
| Metric | Gemini 4 Argon (High) | GPT-5.6 Luna (Medium) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 52.6 | 25.0 | −52.5% GPT-5.6 Luna (Medium) is 52.5% less intelligent |
| Total AA cost (lower is better) | $2,407.24 | $44.32 | −98.2% GPT-5.6 Luna (Medium) is 98.2% cheaper |
| End-to-end time (lower is better) | 63.19s | 6.19s | −90.2% GPT-5.6 Luna (Medium) is 90.2% faster |
| Price per 1M tokens (in / out) | $2.00 / $10.0 | $0.20 / $1.20 | |
| Input modalities | Text, Image | Text, Image |
GPT-5.6 Luna (Medium) vs Gemini 4 Argon (High): 52.5% less intelligence, 98.2% less cost to run the AA benchmark, and 90.2% faster end-to-end.
Today's Pareto frontier
Against the frontier
- Gemini 4 Argon (High) is off the frontier: at the same or lower cost, Claude Opus 5.5 (High, Default Fallback) scores 53.60 for $2172.
- 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.
Gemini 4 Argon (High)GPT-5.6 Luna (Medium)Today's Pareto frontierEvery other model
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Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/gemini-4-argon/gpt-5-6-luna-medium · Markdown: /api/v1/compare/gemini-4-argon/gpt-5-6-luna-medium?format=md · llms.txt · agent skill