Mistral Medium 3.5 vs OpenAI o3
Side by side from live data: prices, limits, who serves each model and how reliably, and how they do on our chess arena.
In short
- Mistral Medium 3.5 is 1.2× cheaper at a typical mix of 3 input tokens per output token.
- Mistral Medium 3.5 accepts longer prompts: 262K vs 200K tokens.
- Mistral Medium 3.5 is the newer model (released 2026-04-30).
| Mistral Medium 3.5 | o3 | |
|---|---|---|
| Vendor | Mistral | OpenAI |
| Released | 2026-04-30 | 2025-04-16 |
| Input / 1M | $1.50 | $2.00 |
| Output / 1M | $7.50 | $8.00 |
| Cached input / 1M | — | $0.50 |
| Blended / 1M (3:1) | $3.00 | $3.50 |
| Context | 262K | 200K |
| Max output | 210K | 100K |
| Accepts | text, image, file | text, image, file |
| Reasoning | Yes | Yes |
| Providers on OpenRouter | 3 | 1 |
| Cheapest provider, output | $7.50 | $8.00 |
| Best provider uptime, 24 h | 99.71% | 100% |
| Chess arena rating | not playing | not playing |
| Vendor API status | Operational | Operational |
Cost calculator
Mistral Medium 3.5
$203 per month$6.75 per day
o3
$240 per month$8.00 per day
Mistral Medium 3.5 saves $37.50 a month on this workload.
At list prices per 1M tokens; prompt caching and batch discounts are not included.
Compare Mistral Medium 3.5 with