GPT-5.6 Luna (Medium) vs Grok 4.3 (Non-reasoning)
Which is better for the money: GPT-5.6 Luna (Medium) 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 2026-10-26.
Clear winner
Verdict
Pick GPT-5.6 Luna (Medium)
Grok 4.3 (Non-reasoning) vs GPT-5.6 Luna (Medium): 44.0% less intelligence, 387.2% more cost to run the AA benchmark, and 12.5% faster end-to-end.
| Metric | GPT-5.6 Luna (Medium) | Grok 4.3 (Non-reasoning) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 25.0 | 14.0 | −44.0% Grok 4.3 (Non-reasoni… is 44.0% less intelligent |
| Total AA cost (lower is better) | $44.32 | $215.93 | +387.2% Grok 4.3 (Non-reasoni… is 4.9× more expensive |
| End-to-end time (lower is better) | 6.64s | 5.81s | −12.5% Grok 4.3 (Non-reasoni… is 12.5% faster |
| 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 (Medium) is off the frontier: at the same or lower cost, GPT-6 Luna (Medium) scores 29.90 for $31.2.
- 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 (Medium)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-medium/grok-4-3-non-reasoning · Markdown: /api/v1/compare/gpt-5-6-luna-medium/grok-4-3-non-reasoning?format=md · llms.txt · agent skill