GPT-6 Luna (Low) vs Grok 4.3 (High)
Which is better for the money: GPT-6 Luna (Low) by OpenAI or Grok 4.3 (High) by SpaceXAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-24.
Trade-off
Verdict
Depends on your budget
Grok 4.3 (High) scores 3.4 points higher (24.9 vs 21.5) but costs 34× as much to run the benchmark ($363 vs $10.6; mid-range vs budget cost classes). They are not alternatives at one budget: pick Grok 4.3 (High) when you need intelligence above 21.5, and GPT-6 Luna (Low) when 21.5 is enough.
| Metric | GPT-6 Luna (Low) | Grok 4.3 (High) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 21.5 | 24.9 | +15.8% Grok 4.3 (High) is 15.8% more intelligent |
| Total AA cost (lower is better) | $10.63 | $363.24 | +3317.1% Grok 4.3 (High) is 34× more expensive |
| End-to-end time (lower is better) | 6.60s | 24.88s | +277.0% Grok 4.3 (High) is 277.0% slower |
| Price per 1M tokens (in / out) | $0.10 / $0.50 | $1.25 / $2.50 | |
| Input modalities | Text, Image | Text, Image |
Grok 4.3 (High) vs GPT-6 Luna (Low): 15.8% more intelligence, 3317.1% more cost to run the AA benchmark, and 277.0% slower end-to-end.
Today's Pareto frontier
Against the frontier
- GPT-6 Luna (Low) is on today's frontier: nothing is both smarter and cheaper.
- Grok 4.3 (High) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Medium) scores 47.80 for $361.
GPT-6 Luna (Low)Grok 4.3 (High)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-6-luna-low/grok-4-3 · Markdown: /api/v1/compare/gpt-6-luna-low/grok-4-3?format=md · llms.txt · agent skill