Model comparison
GPT-5.1-Codex vs Magistral Medium
GPT-5.1-Codex is the stronger model overall, scoring 38.6 to 35.2 on the Noometry Index.
Last verified . 0 shared benchmarks.
Mistral AISummary
- The widest gap is in math, where Magistral Medium leads 35.1 to 30.3.
- 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 262K.
- Magistral Medium has downloadable open weights; the other is API-only.
Side by side
| GPT-5.1-Codex | Magistral Medium | |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Noometry Index | 38.6 | 35.2 |
| Released | 2025-11-12 | 2025-03-17 |
| Weights | Proprietary | Open |
| Context window | 400K | 262K |
| Max output | 128K | 16K |
| Input $ / M tokens | $1.25 | $2 |
| Output $ / M tokens | $10 | $5 |
| Results tracked | 6 | 22 |
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Category by category
Coding GPT-5.1-Codex leads
GPT-5.1-Codex: 41.9 (#116), Magistral Medium: 39.1 (#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 Not comparable
GPT-5.1-Codex: 38.0 (#33), Magistral Medium: —
| Benchmark | GPT-5.1-Codex | Magistral Medium |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| METR Time Horizons | 70.8% | — |
Reasoning Not comparable
GPT-5.1-Codex: —, Magistral Medium: 8.6 (#348)
| 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 Magistral Medium leads
GPT-5.1-Codex: 30.3 (#235), Magistral Medium: 35.1 (#189)
| Benchmark | GPT-5.1-Codex | Magistral Medium |
|---|---|---|
| ProofBench | 9% | — |
| LMArena Math | — | 1250 |
Knowledge Not comparable
GPT-5.1-Codex: —, Magistral Medium: 33.5 (#202)
| Benchmark | GPT-5.1-Codex | Magistral Medium |
|---|---|---|
| LMArena Expert | — | 1223 |
Multilingual Not comparable
GPT-5.1-Codex: —, Magistral Medium: 39.6 (#224)
| Benchmark | GPT-5.1-Codex | Magistral Medium |
|---|---|---|
| LMArena Non-English | — | 1232 |
| LMArena Chinese | — | 1227 |
| LMArena French | — | 1267 |
| LMArena German | — | 1248 |
| LMArena Japanese | — | 1175 |
| LMArena Korean | — | 1125 |
| LMArena Russian | — | 1224 |
| LMArena Spanish | — | 1271 |
Instruction Following Not comparable
GPT-5.1-Codex: —, Magistral Medium: 66.0 (#211)
| Benchmark | GPT-5.1-Codex | Magistral Medium |
|---|---|---|
| LMArena Instruction Following | — | 1254 |
Long Context Not comparable
GPT-5.1-Codex: —, Magistral Medium: 39.3 (#183)
| Benchmark | GPT-5.1-Codex | Magistral Medium |
|---|---|---|
| LMArena Longer Query | — | 1295 |
Writing & Preference Not comparable
GPT-5.1-Codex: —, Magistral Medium: 46.3 (#219)
| Benchmark | GPT-5.1-Codex | Magistral Medium |
|---|---|---|
| LMArena Text | — | 1255 |
| LMArena Creative Writing | — | 1245 |
| LMArena Multi-Turn | — | 1275 |
Frequently asked questions
Is GPT-5.1-Codex better than Magistral Medium?
GPT-5.1-Codex is the stronger model overall, scoring 38.6 to 35.2 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: 41.9 versus 39.1 in the Noometry coding category.
Which has the bigger context window?
GPT-5.1-Codex does, with 400K tokens against 262K.
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.