GPT-6.1 Terra (Xhigh) vs GPT-6 Luna (Low)
Which is better for the money: GPT-6.1 Terra (Xhigh) by OpenAI or GPT-6 Luna (Low) 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-6.1 Terra (Xhigh) scores 23.9 points higher (45.4 vs 21.5) but costs 34× as much to run the benchmark ($365 vs $10.6; mid-range vs budget cost classes). They are not alternatives at one budget: pick GPT-6.1 Terra (Xhigh) when you need intelligence above 21.5, and GPT-6 Luna (Low) when 21.5 is enough.
| Metric | GPT-6.1 Terra (Xhigh) | GPT-6 Luna (Low) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 45.4 | 21.5 | −52.6% GPT-6 Luna (Low) is 52.6% less intelligent |
| Total AA cost (lower is better) | $364.95 | $10.63 | −97.1% GPT-6 Luna (Low) is 97.1% cheaper |
| End-to-end time (lower is better) | 18.82s | 7.07s | −62.4% GPT-6 Luna (Low) is 62.4% faster |
| Price per 1M tokens (in / out) | $1.00 / $5.00 | $0.10 / $0.50 | |
| Input modalities | Text, Image | Text, Image |
GPT-6 Luna (Low) vs GPT-6.1 Terra (Xhigh): 52.6% less intelligence, 97.1% less cost to run the AA benchmark, and 62.4% faster end-to-end.
Today's Pareto frontier
Against the frontier
- GPT-6.1 Terra (Xhigh) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Medium) scores 47.80 for $361.
- GPT-6 Luna (Low) is on today's frontier: nothing is both smarter and cheaper.
GPT-6.1 Terra (Xhigh)GPT-6 Luna (Low)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-6-1-terra-xhigh/gpt-6-luna-low · Markdown: /api/v1/compare/gpt-6-1-terra-xhigh/gpt-6-luna-low?format=md · llms.txt · agent skill