GPT-6 Luna (Medium) vs Grok 4.6 (Xhigh)
Which is better for the money: GPT-6 Luna (Medium) by OpenAI or Grok 4.6 (Xhigh) 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 (Xhigh) scores 14.3 points higher (44.2 vs 29.9) but costs 72× as much to run the benchmark ($2242 vs $31.2; flagship vs budget cost classes). They are not alternatives at one budget: pick Grok 4.6 (Xhigh) when you need intelligence above 29.9, and GPT-6 Luna (Medium) when 29.9 is enough.
| Metric | GPT-6 Luna (Medium) | Grok 4.6 (Xhigh) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 29.9 | 44.2 | +47.8% Grok 4.6 (Xhigh) is 47.8% more intelligent |
| Total AA cost (lower is better) | $31.17 | $2,241.91 | +7092.5% Grok 4.6 (Xhigh) is 72× more expensive |
| End-to-end time (lower is better) | Not reported | 39.83s | — not comparable |
| Price per 1M tokens (in / out) | $0.10 / $0.50 | $2.00 / $6.00 | |
| Input modalities | Text, Image | Text, Image |
Grok 4.6 (Xhigh) vs GPT-6 Luna (Medium): 47.8% more intelligence, 7092.5% more cost to run the AA benchmark, and end-to-end time not fully reported.
Today's Pareto frontier
Against the frontier
- GPT-6 Luna (Medium) is on today's frontier: nothing is both smarter and cheaper.
- Grok 4.6 (Xhigh) is off the frontier: at the same or lower cost, Claude Opus 5.5 (High, Default Fallback) scores 53.60 for $2172.
GPT-6 Luna (Medium)Grok 4.6 (Xhigh)Today's Pareto frontierEvery other model
Matchup
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