GPT-5.6 Luna (High) vs Grok 4.6 (Xhigh)
Which is better for the money: GPT-5.6 Luna (High) by OpenAI or Grok 4.6 (Xhigh) by SpaceXAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-27.
Trade-off
Verdict
Depends on your budget
Grok 4.6 (Xhigh) scores 12.1 points higher (44.2 vs 32.1) but costs 21× as much to run the benchmark ($2242 vs $108; flagship vs mid-range cost classes). They are not alternatives at one budget: pick Grok 4.6 (Xhigh) when you need intelligence above 32.1, and GPT-5.6 Luna (High) when 32.1 is enough.
| Metric | GPT-5.6 Luna (High) | Grok 4.6 (Xhigh) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 32.1 | 44.2 | +37.7% Grok 4.6 (Xhigh) is 37.7% more intelligent |
| Total AA cost (lower is better) | $108.15 | $2,241.91 | +1973.0% Grok 4.6 (Xhigh) is 21× more expensive |
| End-to-end time (lower is better) | 16.69s | 43.76s | +162.2% Grok 4.6 (Xhigh) is 162.2% slower |
| Price per 1M tokens (in / out) | $0.20 / $1.20 | $2.00 / $6.00 | |
| Input modalities | Text, Image | Text, Image |
Grok 4.6 (Xhigh) vs GPT-5.6 Luna (High): 37.7% more intelligence, 1973.0% more cost to run the AA benchmark, and 162.2% slower end-to-end.
Today's Pareto frontier
Against the frontier
- GPT-5.6 Luna (High) is off the frontier: at the same or lower cost, Claude Haiku 5.5 (High) scores 37.80 for $94.1.
- 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-5.6 Luna (High)Grok 4.6 (Xhigh)Today's Pareto frontierEvery other model
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