Model comparison
GPT-5.1-Codex vs Mistral Large
GPT-5.1-Codex is the stronger model overall, scoring 38.6 to 31.9 on the Noometry Index.
Last verified . 1 shared benchmarks.
Mistral AISummary
- They share 1 benchmark with published results for both. GPT-5.1-Codex scores higher in 3 categories and Mistral Large in 0 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.1-Codex leads 30.3 to 18.2.
- Mistral Large is cheaper at $2 / $6 per million input/output tokens, against $1.25 / $10 for GPT-5.1-Codex.
- GPT-5.1-Codex accepts more context: 400K tokens versus 131K.
- Mistral Large has downloadable open weights; the other is API-only.
Side by side
| GPT-5.1-Codex | Mistral Large | |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Noometry Index | 38.6 | 31.9 |
| Released | 2025-11-12 | 2024-02-26 |
| Weights | Proprietary | Open |
| Context window | 400K | 131K |
| Max output | 128K | 16K |
| Input $ / M tokens | $1.25 | $2 |
| Output $ / M tokens | $10 | $6 |
| Results tracked | 6 | 51 |
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Category by category
Coding GPT-5.1-Codex leads
GPT-5.1-Codex: 41.9 (#116), Mistral Large: 34.3 (#240)
| Benchmark | GPT-5.1-Codex | Mistral Large |
|---|---|---|
| ALE-Bench | 1,245 | 264.7 |
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1337 | — |
| SciCode | — | 36.2% |
| BigCodeBench Instruct | — | 30% |
| LiveBench Coding | — | 47.1% |
| LMArena Coding | — | 1277 |
| BigCodeBench Complete | — | 38.3% |
| HumanEval+ | — | 62.2% |
| MBPP+ | — | 59.5% |
Agentic & Tool Use GPT-5.1-Codex leads
GPT-5.1-Codex: 38.0 (#33), Mistral Large: 28.6 (#89)
| Benchmark | GPT-5.1-Codex | Mistral Large |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| Berkeley Function Calling Leaderboard | — | 38.4% |
| METR Time Horizons | 70.8% | — |
Reasoning Not comparable
GPT-5.1-Codex: —, Mistral Large: 15.8 (#310)
| Benchmark | GPT-5.1-Codex | Mistral Large |
|---|---|---|
| SimpleBench | — | 22.5% |
| CritPt | — | 0% |
| LiveBench Reasoning | — | 43.5% |
| LMArena Hard Prompts | — | 1257 |
| DTBench | — | 65.1% |
| LiveBench Data Analysis | — | 50.1% |
| LMCA | — | 16.7% |
| Epoch Capabilities Index | — | 128.52 |
| ForecastBench | — | 57.1 |
| LiveBench | — | 48.4% |
Math GPT-5.1-Codex leads
GPT-5.1-Codex: 30.3 (#235), Mistral Large: 18.2 (#291)
| Benchmark | GPT-5.1-Codex | Mistral Large |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 8.5% |
| ProofBench | 9% | — |
| Omni-MATH | — | 28.1% |
| LiveBench Math | — | 42.5% |
| LMArena Math | — | 1262 |
| MATH Level 5 | — | 50.3% |
| FrontierMath (Feb 2025 set) | — | 0.3% |
Knowledge Not comparable
GPT-5.1-Codex: —, Mistral Large: 30.1 (#230)
| Benchmark | GPT-5.1-Codex | Mistral Large |
|---|---|---|
| GPQA Diamond | — | 51.3% |
| MMLU-Pro | — | 59.9% |
| Confabulations | — | 21.4% |
| Vectara Hallucination Rate | — | 4.5% |
| GPQA (HELM) | — | 43.5% |
| LMArena Expert | — | 1232 |
| MMLU | — | 80% |
Multilingual Not comparable
GPT-5.1-Codex: —, Mistral Large: 40.0 (#219)
| Benchmark | GPT-5.1-Codex | Mistral Large |
|---|---|---|
| LMArena Non-English | — | 1237 |
| LMArena Chinese | — | 1240 |
| LMArena French | — | 1325 |
| LMArena German | — | 1254 |
| LMArena Japanese | — | 1188 |
| LMArena Korean | — | 1202 |
| LMArena Russian | — | 1257 |
| LMArena Spanish | — | 1268 |
Instruction Following Not comparable
GPT-5.1-Codex: —, Mistral Large: 67.9 (#191)
| Benchmark | GPT-5.1-Codex | Mistral Large |
|---|---|---|
| LiveBench Instruction Following | — | 67.9% |
| IFEval | — | 87.7% |
| LMArena Instruction Following | — | 1249 |
Long Context Not comparable
GPT-5.1-Codex: —, Mistral Large: 38.3 (#199)
| Benchmark | GPT-5.1-Codex | Mistral Large |
|---|---|---|
| LMArena Longer Query | — | 1261 |
Writing & Preference Not comparable
GPT-5.1-Codex: —, Mistral Large: 40.7 (#242)
| Benchmark | GPT-5.1-Codex | Mistral Large |
|---|---|---|
| LMArena Text | — | 1266 |
| LMArena Creative Writing | — | 1243 |
| Short-Story Creative Writing | — | 69% |
| EQ-Bench Creative Writing | — | 985 |
| WildBench | — | 80.1% |
| LMArena Multi-Turn | — | 1260 |
| LiveBench Language | — | 39.4% |
Frequently asked questions
Is GPT-5.1-Codex better than Mistral Large?
GPT-5.1-Codex is the stronger model overall, scoring 38.6 to 31.9 on the Noometry Index.
Which is cheaper, GPT-5.1-Codex or Mistral Large?
Mistral Large is cheaper. It lists at $2 per million input tokens and $6 per million output tokens; GPT-5.1-Codex lists at $1.25 and $10.
Is GPT-5.1-Codex or Mistral Large better for coding?
GPT-5.1-Codex scores higher on coding benchmarks: 41.9 versus 34.3 in the Noometry coding category.
Which has the bigger context window?
GPT-5.1-Codex does, with 400K tokens against 131K.
How many benchmarks do GPT-5.1-Codex and Mistral Large share?
1 benchmark has published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and Mistral Large has 51.