GPT-6 Astra (Medium) vs Mistral Medium 3.5
Which is better for the money: GPT-6 Astra (Medium) by OpenAI or Mistral Medium 3.5 by Mistral? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-25.
Trade-off
Verdict
Depends on your budget
GPT-6 Astra (Medium) scores 35.4 points higher (49.6 vs 14.2) but costs 1.9× as much to run the benchmark ($2434 vs $1264; flagship vs premium cost classes). Pick GPT-6 Astra (Medium) when the extra intelligence is worth the premium, otherwise Mistral Medium 3.5.
| Metric | GPT-6 Astra (Medium) | Mistral Medium 3.5 | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 49.6 | 14.2 | −71.4% Mistral Medium 3.5 is 71.4% less intelligent |
| Total AA cost (lower is better) | $2,434.12 | $1,263.80 | −48.1% Mistral Medium 3.5 is 48.1% cheaper |
| End-to-end time (lower is better) | 14.07s | 17.85s | +26.9% Mistral Medium 3.5 is 26.9% slower |
| Price per 1M tokens (in / out) | $10.0 / $50.0 | $1.50 / $7.50 | |
| Input modalities | Text, Image | Text, Image |
Mistral Medium 3.5 vs GPT-6 Astra (Medium): 71.4% less intelligence, 48.1% less cost to run the AA benchmark, and 26.9% 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 Medium 3.5 is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
GPT-6 Astra (Medium)Mistral Medium 3.5Today's Pareto frontierOpen-weights frontierEvery other model
Matchup
Compare something else
Agents:
Accept: text/markdown or ?format=md returns this page as Markdown. JSON: /api/v1/compare/gpt-6-astra-medium/mistral-medium-3-5 · Markdown: /api/v1/compare/gpt-6-astra-medium/mistral-medium-3-5?format=md · llms.txt · agent skill