Claude Opus 5.5 vs Mistral Medium 3.1
Price, context window & benchmark comparison
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Verdict: Mistral Medium 3.1 is 10.0× cheaper than Claude Opus 5.5 on a typical 3:1 input/output mix. Claude Opus 5.5 scores higher on the Artificial Analysis Intelligence Index (57.6 vs 9.2). Claude Opus 5.5 has the larger context window (1M vs 131K).
| Claude Opus 5.5 | Mistral Medium 3.1 | |
|---|---|---|
| Input price / 1M | $4.00 | $0.40 |
| Output price / 1M | $20.00 | $2.00 |
| Blended price (3:1) | $8.00 | $0.80 |
| Cached input / 1M | $0.20 | $0.04 |
| Context window | 1M | 131K |
| Max output | 128K | 105K |
| Intelligence index | 57.6 | 9.2 |
| Coding index | — | 20.5 |
| Providers | 11 | — |
| Best provider uptime (30m) | 100.0% | — |
| Vision input | Yes | Yes |
| Reasoning | Yes | No |
| Tool calling | Yes | Yes |
| Released | 2026-09-22 | 2025-08-13 |
| Retirement | — | — |
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FAQ
Which is cheaper, Claude Opus 5.5 or Mistral Medium 3.1?
Mistral Medium 3.1 is 10.0× cheaper than Claude Opus 5.5 on a typical 3:1 input/output mix.
Claude Opus 5.5 vs Mistral Medium 3.1: which has a bigger context window?
Claude Opus 5.5: 1,000,000 tokens. Mistral Medium 3.1: 131,072 tokens.
How much would 1 million requests cost?
At 2,000 input + 500 output tokens per request: Claude Opus 5.5 ≈ $18,000, Mistral Medium 3.1 ≈ $1,800.
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