GPT-5.6 Luna (High) vs Grok 4.6 (Medium)
Which is better for the money: GPT-5.6 Luna (High) 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 10.7 points higher (42.8 vs 32.1) but costs 14× as much to run the benchmark ($1557 vs $108; premium vs mid-range cost classes). They are not alternatives at one budget: pick Grok 4.6 (Medium) 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 (Medium) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 32.1 | 42.8 | +33.3% Grok 4.6 (Medium) is 33.3% more intelligent |
| Total AA cost (lower is better) | $108.15 | $1,557.04 | +1339.7% Grok 4.6 (Medium) is 14× more expensive |
| End-to-end time (lower is better) | 14.62s | 34.77s | +137.8% Grok 4.6 (Medium) is 137.8% slower |
| Price per 1M tokens (in / out) | $0.20 / $1.20 | $2.00 / $6.00 | |
| Input modalities | Text, Image | Text, Image |
Grok 4.6 (Medium) vs GPT-5.6 Luna (High): 33.3% more intelligence, 1339.7% more cost to run the AA benchmark, and 137.8% 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 (Medium) 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 4.6 (Medium)Today's Pareto frontierEvery other model
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