GPT-5.6 Luna (Low) vs Grok 4.3 (Non-reasoning)
Which is better for the money: GPT-5.6 Luna (Low) by OpenAI or Grok 4.3 (Non-reasoning) by SpaceXAI? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-27.
Clear winner
Verdict
Pick GPT-5.6 Luna (Low)
Grok 4.3 (Non-reasoning) vs GPT-5.6 Luna (Low): 33.3% less intelligence, 699.1% more cost to run the AA benchmark, and 3.2% slower end-to-end.
| Metric | GPT-5.6 Luna (Low) | Grok 4.3 (Non-reasoning) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 21.0 | 14.0 | −33.3% Grok 4.3 (Non-reasoni… is 33.3% less intelligent |
| Total AA cost (lower is better) | $27.02 | $215.93 | +699.1% Grok 4.3 (Non-reasoni… is 8.0× more expensive |
| End-to-end time (lower is better) | 5.71s | 5.89s | +3.2% Grok 4.3 (Non-reasoni… is 3.2% slower |
| Price per 1M tokens (in / out) | $0.20 / $1.20 | $1.25 / $2.50 | |
| Input modalities | Text, Image | Text, Image |
Today's Pareto frontier
Against the frontier
- GPT-5.6 Luna (Low) is off the frontier: at the same or lower cost, GPT-6 Luna (Low) scores 21.50 for $10.6.
- Grok 4.3 (Non-reasoning) is off the frontier: at the same or lower cost, MiMo-V2.6-Pro scores 46.30 for $207.
GPT-5.6 Luna (Low)Grok 4.3 (Non-reasoning)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-low/grok-4-3-non-reasoning · Markdown: /api/v1/compare/gpt-5-6-luna-low/grok-4-3-non-reasoning?format=md · llms.txt · agent skill