# Mistral Medium 3.1 vs o3-pro

> o3-pro is the stronger model overall, scoring 42.9 to 31.9 on the Noometry Index. Mistral Medium 3.1 costs 44× less per token, which makes it the better buy when o3-pro's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/mistral-medium-3-1-vs-o3-pro
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in reasoning, where o3-pro leads 23.8 to 10.6.
- Mistral Medium 3.1 is cheaper at $0.40 / $2 per million input/output tokens, against $20 / $80 for o3-pro.
- o3-pro accepts more context: 200K tokens versus 131K.

## Snapshot

| | Mistral Medium 3.1 | o3-pro |
|---|---|---|
| Provider | Mistral AI | OpenAI |
| Noometry Index | 31.9 | 42.9 |
| Rank | 266 | 105 |
| Context | 131K | 200K |
| Input $/M | $0.40 | $20 |
| Output $/M | $2 | $80 |
| Weights | Proprietary | Proprietary |

## Coding

- Mistral Medium 3.1: —
- o3-pro: 55.5 (#24)

| Benchmark | Mistral Medium 3.1 | o3-pro |
|---|---|---|
| Aider Polyglot | — | 84.9% |
| WeirdML | — | 58.2% |

## Reasoning

- Mistral Medium 3.1: 10.6 (#341)
- o3-pro: 23.8 (#171)

| Benchmark | Mistral Medium 3.1 | o3-pro |
|---|---|---|
| ARC-AGI-2 | — | 4.9% |
| Kagi LLM Benchmark | — | 72.1% |
| NYT Connections (extended) | 6.5% | — |
| ARC-AGI-1 | — | 59.3% |
| Thematic Generalization | 20.3% | — |
| DTBench | — | 86.9% |
| LMCA | — | 38.5% |
| Epoch Capabilities Index | — | 147.42 |

## Knowledge

- Mistral Medium 3.1: —
- o3-pro: 29.5 (#238)

| Benchmark | Mistral Medium 3.1 | o3-pro |
|---|---|---|
| Confabulations | — | 14.2% |
| Vectara Hallucination Rate | — | 23.3% |

## Long Context

- Mistral Medium 3.1: —
- o3-pro: 72.2 (#1)

| Benchmark | Mistral Medium 3.1 | o3-pro |
|---|---|---|
| Fiction.LiveBench | — | 97.2% |

## Writing & Preference

- Mistral Medium 3.1: 55.5 (#145)
- o3-pro: 57.1 (#133)

| Benchmark | Mistral Medium 3.1 | o3-pro |
|---|---|---|
| Short-Story Creative Writing | — | 84.4% |
| EQ-Bench Creative Writing | 1476 | — |

## FAQ

### Is Mistral Medium 3.1 better than o3-pro?

o3-pro is the stronger model overall, scoring 42.9 to 31.9 on the Noometry Index. Mistral Medium 3.1 costs 44× less per token, which makes it the better buy when o3-pro's lead doesn't matter for your workload.

### Which is cheaper, Mistral Medium 3.1 or o3-pro?

Mistral Medium 3.1 is cheaper. It lists at $0.40 per million input tokens and $2 per million output tokens; o3-pro lists at $20 and $80.

### Which has the bigger context window?

o3-pro does, with 200K tokens against 131K.

### How many benchmarks do Mistral Medium 3.1 and o3-pro share?

0 benchmarks have published results for both models. Mistral Medium 3.1 has 3 scored results on Noometry and o3-pro has 12.