GPT-5.6 Luna (Xhigh) vs Grok 4.6 (High)
Which is better for the money: GPT-5.6 Luna (Xhigh) by OpenAI or Grok 4.6 (High) 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 (High) scores 9.7 points higher (44.3 vs 34.6) but costs 11× as much to run the benchmark ($1963 vs $179; premium vs mid-range cost classes). They are not alternatives at one budget: pick Grok 4.6 (High) when you need intelligence above 34.6, and GPT-5.6 Luna (Xhigh) when 34.6 is enough.
| Metric | GPT-5.6 Luna (Xhigh) | Grok 4.6 (High) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 34.6 | 44.3 | +28.0% Grok 4.6 (High) is 28.0% more intelligent |
| Total AA cost (lower is better) | $179.33 | $1,962.90 | +994.6% Grok 4.6 (High) is 11× more expensive |
| End-to-end time (lower is better) | 45.80s | 37.09s | −19.0% Grok 4.6 (High) is 19.0% faster |
| Price per 1M tokens (in / out) | $0.20 / $1.20 | $2.00 / $6.00 | |
| Input modalities | Text, Image | Text, Image |
Grok 4.6 (High) vs GPT-5.6 Luna (Xhigh): 28.0% more intelligence, 994.6% more cost to run the AA benchmark, and 19.0% faster end-to-end.
Today's Pareto frontier
Against the frontier
- GPT-5.6 Luna (Xhigh) is off the frontier: at the same or lower cost, GPT-6.1 Terra (Medium) scores 41.30 for $175.
- Grok 4.6 (High) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
GPT-5.6 Luna (Xhigh)Grok 4.6 (High)Today's Pareto frontierEvery other model
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