# GPT-5.1-Codex vs Mistral Small 3.2

> GPT-5.1-Codex is the stronger model overall, scoring 38.2 to 30.8 on the Noometry Index. Mistral Small 3.2 costs 26× less per token, which makes it the better buy when GPT-5.1-Codex's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gpt-5-1-codex-vs-mistral-small-3-2
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in math, where GPT-5.1-Codex leads 29.3 to 24.9.
- Mistral Small 3.2 is cheaper at $0.0938 / $0.25 per million input/output tokens, against $1.25 / $10 for GPT-5.1-Codex.
- GPT-5.1-Codex accepts more context: 400K tokens versus 256K.
- Mistral Small 3.2 has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.1-Codex | Mistral Small 3.2 |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Noometry Index | 38.2 | 30.8 |
| Rank | 178 | 271 |
| Context | 400K | 256K |
| Input $/M | $1.25 | $0.0938 |
| Output $/M | $10 | $0.25 |
| Weights | Proprietary | Open |

## Coding

- GPT-5.1-Codex: 41.7 (#107)
- Mistral Small 3.2: —

| Benchmark | GPT-5.1-Codex | Mistral Small 3.2 |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1337 | — |
| ALE-Bench | 1,245 | — |

## Agentic & Tool Use

- GPT-5.1-Codex: 37.8 (#32)
- Mistral Small 3.2: —

| Benchmark | GPT-5.1-Codex | Mistral Small 3.2 |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| METR Time Horizons | 70.8% | — |

## Reasoning

- GPT-5.1-Codex: —
- Mistral Small 3.2: 17.5 (#282)

| Benchmark | GPT-5.1-Codex | Mistral Small 3.2 |
|---|---|---|
| Kagi LLM Benchmark | — | 40.4% |
| Chess Puzzles | — | 1% |
| Epoch Capabilities Index | — | 131.73 |

## Math

- GPT-5.1-Codex: 29.3 (#218)
- Mistral Small 3.2: 24.9 (#251)

| Benchmark | GPT-5.1-Codex | Mistral Small 3.2 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 30.3% |
| ProofBench | 9% | — |

## Knowledge

- GPT-5.1-Codex: —
- Mistral Small 3.2: 26.8 (#249)

| Benchmark | GPT-5.1-Codex | Mistral Small 3.2 |
|---|---|---|
| GPQA Diamond | — | 49.1% |

## Writing & Preference

- GPT-5.1-Codex: —
- Mistral Small 3.2: 45.1 (#219)

| Benchmark | GPT-5.1-Codex | Mistral Small 3.2 |
|---|---|---|
| EQ-Bench Creative Writing | — | 1255 |

## FAQ

### Is GPT-5.1-Codex better than Mistral Small 3.2?

GPT-5.1-Codex is the stronger model overall, scoring 38.2 to 30.8 on the Noometry Index. Mistral Small 3.2 costs 26× less per token, which makes it the better buy when GPT-5.1-Codex's lead doesn't matter for your workload.

### Which is cheaper, GPT-5.1-Codex or Mistral Small 3.2?

Mistral Small 3.2 is cheaper. It lists at $0.0938 per million input tokens and $0.25 per million output tokens; GPT-5.1-Codex lists at $1.25 and $10.

### Which has the bigger context window?

GPT-5.1-Codex does, with 400K tokens against 256K.

### How many benchmarks do GPT-5.1-Codex and Mistral Small 3.2 share?

0 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Mistral Small 3.2 has 6.