GPT-6.1 Terra (Xhigh) vs GPT-6 Luna (Xhigh)
Which is better for the money: GPT-6.1 Terra (Xhigh) by OpenAI or GPT-6 Luna (Xhigh) 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 10.8 points higher (45.4 vs 34.6) but costs 5.5× as much to run the benchmark ($365 vs $66.8; both mid-range class). They are not alternatives at one budget: pick GPT-6.1 Terra (Xhigh) when you need intelligence above 34.6, and GPT-6 Luna (Xhigh) when 34.6 is enough.
| Metric | GPT-6.1 Terra (Xhigh) | GPT-6 Luna (Xhigh) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 45.4 | 34.6 | −23.8% GPT-6 Luna (Xhigh) is 23.8% less intelligent |
| Total AA cost (lower is better) | $364.95 | $66.81 | −81.7% GPT-6 Luna (Xhigh) is 81.7% cheaper |
| End-to-end time (lower is better) | 18.82s | 27.33s | +45.2% GPT-6 Luna (Xhigh) is 45.2% slower |
| Price per 1M tokens (in / out) | $1.00 / $5.00 | $0.10 / $0.50 | |
| Input modalities | Text, Image | Text, Image |
GPT-6 Luna (Xhigh) vs GPT-6.1 Terra (Xhigh): 23.8% less intelligence, 81.7% less cost to run the AA benchmark, and 45.2% slower 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 (Xhigh) is on today's frontier: nothing is both smarter and cheaper.
GPT-6.1 Terra (Xhigh)GPT-6 Luna (Xhigh)Today's Pareto frontierEvery other model
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