GPT-5.6 Luna (High) vs Grok 4.5 (High)
Which is better for the money: GPT-5.6 Luna (High) by OpenAI or Grok 4.5 (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 4.5 (High) scores 6.7 points higher (38.8 vs 32.1) but costs 12× as much to run the benchmark ($1244 vs $108; premium vs mid-range cost classes). They are not alternatives at one budget: pick Grok 4.5 (High) 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 4.5 (High) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 32.1 | 38.8 | +20.9% Grok 4.5 (High) is 20.9% more intelligent |
| Total AA cost (lower is better) | $108.15 | $1,243.85 | +1050.1% Grok 4.5 (High) is 12× more expensive |
| End-to-end time (lower is better) | 13.41s | 20.04s | +49.4% Grok 4.5 (High) is 49.4% slower |
| Price per 1M tokens (in / out) | $0.20 / $1.20 | $2.00 / $6.00 | |
| Input modalities | Text, Image | Text, Image |
Grok 4.5 (High) vs GPT-5.6 Luna (High): 20.9% more intelligence, 1050.1% more cost to run the AA benchmark, and 49.4% 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 4.5 (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 (High)Grok 4.5 (High)Today's Pareto frontierEvery other model
Matchup
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