# GPT-5.1-Codex vs Magistral Medium

> GPT-5.1-Codex is the stronger model overall, scoring 38.2 to 34.8 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-1-codex-vs-magistral-medium
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in coding, where GPT-5.1-Codex leads 41.7 to 38.6.
- Magistral Medium is cheaper at $2 / $5 per million input/output tokens, against $1.25 / $10 for GPT-5.1-Codex.
- GPT-5.1-Codex accepts more context: 400K tokens versus 128K.
- Magistral Medium has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.1-Codex | Magistral Medium |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Noometry Index | 38.2 | 34.8 |
| Rank | 178 | 224 |
| Context | 400K | 128K |
| Input $/M | $1.25 | $2 |
| Output $/M | $10 | $5 |
| Weights | Proprietary | Open |

## Coding

- GPT-5.1-Codex: 41.7 (#107)
- Magistral Medium: 38.6 (#161)

| Benchmark | GPT-5.1-Codex | Magistral Medium |
|---|---|---|
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1337 | — |
| SciCode | — | 39.2% |
| LMArena Coding | — | 1319 |
| ALE-Bench | 1,245 | — |

## Agentic & Tool Use

- GPT-5.1-Codex: 37.8 (#32)
- Magistral Medium: —

| Benchmark | GPT-5.1-Codex | Magistral Medium |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| METR Time Horizons | 70.8% | — |

## Reasoning

- GPT-5.1-Codex: —
- Magistral Medium: 8.7 (#342)

| Benchmark | GPT-5.1-Codex | Magistral Medium |
|---|---|---|
| ARC-AGI-2 | — | 0% |
| Kagi LLM Benchmark | — | 16.2% |
| ARC-AGI-1 | — | 6.1% |
| CritPt | — | 0.3% |
| LMArena Hard Prompts | — | 1267 |

## Math

- GPT-5.1-Codex: 29.3 (#218)
- Magistral Medium: 32.4 (#187)

| Benchmark | GPT-5.1-Codex | Magistral Medium |
|---|---|---|
| ProofBench | 9% | — |
| LMArena Math | — | 1249 |

## Knowledge

- GPT-5.1-Codex: —
- Magistral Medium: 32.9 (#199)

| Benchmark | GPT-5.1-Codex | Magistral Medium |
|---|---|---|
| LMArena Expert | — | 1222 |

## Multilingual

- GPT-5.1-Codex: —
- Magistral Medium: 39.8 (#219)

| Benchmark | GPT-5.1-Codex | Magistral Medium |
|---|---|---|
| LMArena Non-English | — | 1232 |
| LMArena Chinese | — | 1225 |
| LMArena French | — | 1268 |
| LMArena German | — | 1248 |
| LMArena Japanese | — | 1176 |
| LMArena Korean | — | 1125 |
| LMArena Russian | — | 1224 |
| LMArena Spanish | — | 1269 |

## Instruction Following

- GPT-5.1-Codex: —
- Magistral Medium: 66.2 (#207)

| Benchmark | GPT-5.1-Codex | Magistral Medium |
|---|---|---|
| LMArena Instruction Following | — | 1254 |

## Long Context

- GPT-5.1-Codex: —
- Magistral Medium: 39.3 (#178)

| Benchmark | GPT-5.1-Codex | Magistral Medium |
|---|---|---|
| LMArena Longer Query | — | 1295 |

## Writing & Preference

- GPT-5.1-Codex: —
- Magistral Medium: 46.5 (#214)

| Benchmark | GPT-5.1-Codex | Magistral Medium |
|---|---|---|
| LMArena Text | — | 1255 |
| LMArena Creative Writing | — | 1245 |
| LMArena Multi-Turn | — | 1275 |

## FAQ

### Is GPT-5.1-Codex better than Magistral Medium?

GPT-5.1-Codex is the stronger model overall, scoring 38.2 to 34.8 on the Noometry Index.

### Which is cheaper, GPT-5.1-Codex or Magistral Medium?

Magistral Medium is cheaper. It lists at $2 per million input tokens and $5 per million output tokens; GPT-5.1-Codex lists at $1.25 and $10.

### Is GPT-5.1-Codex or Magistral Medium better for coding?

GPT-5.1-Codex scores higher on coding benchmarks: 41.7 versus 38.6 in the Noometry coding category.

### Which has the bigger context window?

GPT-5.1-Codex does, with 400K tokens against 128K.

### How many benchmarks do GPT-5.1-Codex and Magistral Medium share?

0 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Magistral Medium has 22.