GPT-5.6 Luna (High) vs Grok 4.6 (Low)
Which is better for the money: GPT-5.6 Luna (High) by OpenAI or Grok 4.6 (Low) 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 (Low) scores 3.0 points higher (35.1 vs 32.1) but costs 5.7× as much to run the benchmark ($614 vs $108; premium vs mid-range cost classes). They are not alternatives at one budget: pick Grok 4.6 (Low) 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 (Low) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 32.1 | 35.1 | +9.3% Grok 4.6 (Low) is 9.3% more intelligent |
| Total AA cost (lower is better) | $108.15 | $613.92 | +467.7% Grok 4.6 (Low) is 5.7× more expensive |
| End-to-end time (lower is better) | 16.71s | 13.31s | −20.3% Grok 4.6 (Low) is 20.3% faster |
| Price per 1M tokens (in / out) | $0.20 / $1.20 | $2.00 / $6.00 | |
| Input modalities | Text, Image | Text, Image |
Grok 4.6 (Low) vs GPT-5.6 Luna (High): 9.3% more intelligence, 467.7% more cost to run the AA benchmark, and 20.3% faster 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 (Low) is off the frontier: at the same or lower cost, GPT-6.1 Sol (High) scores 50.20 for $521.
GPT-5.6 Luna (High)Grok 4.6 (Low)Today's Pareto frontierEvery other model
Matchup
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Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/gpt-5-6-luna-high/grok-4-6-low · Markdown: /api/v1/compare/gpt-5-6-luna-high/grok-4-6-low?format=md · llms.txt · agent skill