Gemini 4 Carbon (Low) vs GPT-6 Luna (Medium)
Which is better for the money: Gemini 4 Carbon (Low) by Google or GPT-6 Luna (Medium) by OpenAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-11-04.
Trade-off
Verdict
Depends on your budget
Gemini 4 Carbon (Low) scores 35.7 points higher (54.2 vs 18.5) but costs 145× as much to run the benchmark ($5725 vs $39.5; flagship vs budget cost classes). They are not alternatives at one budget: pick Gemini 4 Carbon (Low) when you need intelligence above 18.5, and GPT-6 Luna (Medium) when 18.5 is enough.
| Metric | Gemini 4 Carbon (Low) | GPT-6 Luna (Medium) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 54.2 | 18.5 | −65.9% GPT-6 Luna (Medium) is 65.9% less intelligent |
| Total AA cost (lower is better) | $5,725.02 | $39.55 | −99.3% GPT-6 Luna (Medium) is 99.3% cheaper |
| End-to-end time (lower is better) | 10.19s | Not reported | — not comparable |
| Price per 1M tokens (in / out) | $4.00 / $20.0 | $0.10 / $0.50 | |
| Input modalities | Text, Image, Speech, Video | Text, Image |
GPT-6 Luna (Medium) vs Gemini 4 Carbon (Low): 65.9% less intelligence, 99.3% less cost to run the AA benchmark, and end-to-end time not fully reported.
Today's Pareto frontier
Against the frontier
- Gemini 4 Carbon (Low) is off the frontier: at the same or lower cost, Claude Opus 5.5 (Xhigh, Default Fallback) scores 57.40 for $4766.
- GPT-6 Luna (Medium) is on today's frontier: nothing is both smarter and cheaper.
Gemini 4 Carbon (Low)GPT-6 Luna (Medium)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/gemini-4-carbon-low/gpt-6-luna-medium · Markdown: /api/v1/compare/gemini-4-carbon-low/gpt-6-luna-medium?format=md · llms.txt · agent skill