GPT-6 Luna (Xhigh) vs Grok 4.6 (Medium)
Which is better for the money: GPT-6 Luna (Xhigh) by OpenAI or Grok 4.6 (Medium) by SpaceXAI? 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
Grok 4.6 (Medium) scores 8.2 points higher (42.8 vs 34.6) but costs 23× as much to run the benchmark ($1557 vs $66.8; premium vs mid-range cost classes). They are not alternatives at one budget: pick Grok 4.6 (Medium) when you need intelligence above 34.6, and GPT-6 Luna (Xhigh) when 34.6 is enough.
| Metric | GPT-6 Luna (Xhigh) | Grok 4.6 (Medium) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 34.6 | 42.8 | +23.7% Grok 4.6 (Medium) is 23.7% more intelligent |
| Total AA cost (lower is better) | $66.81 | $1,557.04 | +2230.5% Grok 4.6 (Medium) is 23× more expensive |
| End-to-end time (lower is better) | 27.06s | 34.32s | +26.8% Grok 4.6 (Medium) is 26.8% slower |
| Price per 1M tokens (in / out) | $0.10 / $0.50 | $2.00 / $6.00 | |
| Input modalities | Text, Image | Text, Image |
Grok 4.6 (Medium) vs GPT-6 Luna (Xhigh): 23.7% more intelligence, 2230.5% more cost to run the AA benchmark, and 26.8% slower end-to-end.
Today's Pareto frontier
Against the frontier
- GPT-6 Luna (Xhigh) is on today's frontier: nothing is both smarter and cheaper.
- Grok 4.6 (Medium) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
GPT-6 Luna (Xhigh)Grok 4.6 (Medium)Today's Pareto frontierEvery other model
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