GPT-6 Astra (Medium) vs Mistral Small 4 (Reasoning)
Which is better for the money: GPT-6 Astra (Medium) by OpenAI or Mistral Small 4 (Reasoning) by Mistral? 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
GPT-6 Astra (Medium) scores 38.3 points higher (49.6 vs 11.3) but costs 57× as much to run the benchmark ($2434 vs $42.5; flagship vs budget cost classes). They are not alternatives at one budget: pick GPT-6 Astra (Medium) when you need intelligence above 11.3, and Mistral Small 4 (Reasoning) when 11.3 is enough.
| Metric | GPT-6 Astra (Medium) | Mistral Small 4 (Reasoning) | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 49.6 | 11.3 | −77.2% Mistral Small 4 (Reas… is 77.2% less intelligent |
| Total AA cost (lower is better) | $2,434.12 | $42.50 | −98.3% Mistral Small 4 (Reas… is 98.3% cheaper |
| End-to-end time (lower is better) | 14.48s | 14.50s | +0.1% Mistral Small 4 (Reas… is 0.1% slower |
| Price per 1M tokens (in / out) | $10.0 / $50.0 | $0.15 / $0.60 | |
| Input modalities | Text, Image | Text, Image |
Mistral Small 4 (Reasoning) vs GPT-6 Astra (Medium): 77.2% less intelligence, 98.3% less cost to run the AA benchmark, and 0.1% slower end-to-end.
Today's Pareto frontier
Against the frontier
- GPT-6 Astra (Medium) is off the frontier: at the same or lower cost, Claude Opus 5.5 (High, Default Fallback) scores 53.60 for $2172.
- Mistral Small 4 (Reasoning) is off the frontier: at the same or lower cost, GPT-6 Luna (Medium) scores 29.90 for $31.2.
GPT-6 Astra (Medium)Mistral Small 4 (Reasoning)Today'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-6-astra-medium/mistral-small-4 · Markdown: /api/v1/compare/gpt-6-astra-medium/mistral-small-4?format=md · llms.txt · agent skill