GPT-5.6 Luna (Xhigh) vs Mistral Medium 3.5
Which is better for the money: GPT-5.6 Luna (Xhigh) by OpenAI or Mistral Medium 3.5 by Mistral? 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 (Xhigh)
Mistral Medium 3.5 vs GPT-5.6 Luna (Xhigh): 59.0% less intelligence, 539.4% more cost to run the AA benchmark, and 62.2% faster end-to-end.
| Metric | GPT-5.6 Luna (Xhigh) | Mistral Medium 3.5 | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 34.6 | 14.2 | −59.0% Mistral Medium 3.5 is 59.0% less intelligent |
| Total AA cost (lower is better) | $179.33 | $1,146.55 | +539.4% Mistral Medium 3.5 is 6.4× more expensive |
| End-to-end time (lower is better) | 45.80s | 17.29s | −62.2% Mistral Medium 3.5 is 62.2% faster |
| Price per 1M tokens (in / out) | $0.20 / $1.20 | $1.50 / $7.50 | |
| Input modalities | Text, Image | Text, Image |
Today's Pareto frontier
Against the frontier
- GPT-5.6 Luna (Xhigh) is off the frontier: at the same or lower cost, GPT-6.1 Terra (Medium) scores 41.30 for $175.
- Mistral Medium 3.5 is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
GPT-5.6 Luna (Xhigh)Mistral Medium 3.5Today's Pareto frontierOpen-weights 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-xhigh/mistral-medium-3-5 · Markdown: /api/v1/compare/gpt-5-6-luna-xhigh/mistral-medium-3-5?format=md · llms.txt · agent skill