Model comparison
GPT-5 vs Mistral Small 3.1
GPT-5 is the stronger model overall, scoring 50.9 to 31.4 on the Noometry Index. Mistral Small 3.1 costs 8.6× less per token, which makes it the better buy when GPT-5's lead doesn't matter for your workload.
Last verified . 28 shared benchmarks.
Mistral AISummary
- They share 28 benchmarks with published results for both. GPT-5 scores higher in 9 categories and Mistral Small 3.1 in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5 leads 54.6 to 13.7.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 91.4% for GPT-5 and 3.9% for Mistral Small 3.1.
- Mistral Small 3.1 is cheaper at $0.35 / $0.56 per million input/output tokens, against $1.25 / $10 for GPT-5.
- GPT-5 accepts more context: 400K tokens versus 128K.
- Mistral Small 3.1 has downloadable open weights; the other is API-only.
Side by side
| GPT-5 | Mistral Small 3.1 | |
|---|---|---|
| Provider | OpenAI | Mistral AI |
| Noometry Index | 50.9 | 31.4 |
| Released | 2025-08-07 | 2025-03-17 |
| Weights | Proprietary | Open |
| Context window | 400K | 128K |
| Max output | 128K | 102K |
| Input $ / M tokens | $1.25 | $0.35 |
| Output $ / M tokens | $10 | $0.56 |
| Results tracked | 69 | 28 |
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Category by category
Coding GPT-5 leads
GPT-5: 50.7 (#39), Mistral Small 3.1: 37.7 (#175)
| Benchmark | GPT-5 | Mistral Small 3.1 |
|---|---|---|
| LMArena Coding | 1436 | 1309 |
| SWE-bench Verified | 73.6% | — |
| SWE-bench Verified (bash only) | 65% | — |
| Aider Polyglot | 88% | — |
| LMArena WebDev | 1417 | — |
| SciCode | 42.9% | — |
| GSO | 6.9% | — |
| WeirdML | 60.7% | — |
| ALE-Bench | 1,162 | — |
| AlgoTune | 1.67 | — |
Agentic & Tool Use Not comparable
GPT-5: 33.0 (#53), Mistral Small 3.1: —
| Benchmark | GPT-5 | Mistral Small 3.1 |
|---|---|---|
| Terminal-Bench | 49.6% | — |
| GDPval | 34.8% | — |
| Remote Labor Index | 1.7% | — |
| DeepResearch Bench | 49.6% | — |
| BALROG | 32.8% | — |
| LMArena Search | 1133 | — |
| METR Time Horizons | 69.6% | — |
Reasoning GPT-5 leads
GPT-5: 38.3 (#55), Mistral Small 3.1: 18.9 (#249)
| Benchmark | GPT-5 | Mistral Small 3.1 |
|---|---|---|
| Chess Puzzles | 37% | 1% |
| LMArena Hard Prompts | 1415 | 1278 |
| Epoch Capabilities Index | 150 | 127.48 |
| ARC-AGI-2 | 9.9% | — |
| SimpleBench | 56.7% | — |
| Kagi LLM Benchmark | 72.7% | — |
| ARC-AGI-1 | 65.7% | — |
| CritPt | 12.6% | — |
| EnigmaEval | 10.5% | — |
| EBR-Bench | 12.7% | — |
| Mystery Game Puzzles | 23% | — |
| DTBench | 90.7% | — |
| LMCA | 40% | — |
| ForecastBench | 61.4 | — |
Math GPT-5 leads
GPT-5: 54.6 (#36), Mistral Small 3.1: 13.7 (#295)
| Benchmark | GPT-5 | Mistral Small 3.1 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 91.4% | 3.9% |
| Omni-MATH | 64.7% | 24.8% |
| LMArena Math | 1406 | 1261 |
| FrontierMath (Tiers 1-3) | 55.4% | — |
| FrontierMath Tier 4 | 22% | — |
| ProofBench | 18% | — |
| MATH Level 5 | 98.1% | — |
| FrontierMath (Feb 2025 set) | 32.4% | — |
| FrontierMath Tier 4 (v1) | 12.5% | — |
Knowledge GPT-5 leads
GPT-5: 56.5 (#37), Mistral Small 3.1: 22.6 (#266)
| Benchmark | GPT-5 | Mistral Small 3.1 |
|---|---|---|
| GPQA Diamond | 86.2% | 41.9% |
| MMLU-Pro | 86.3% | 61% |
| GPQA (HELM) | 79.2% | 39.2% |
| LMArena Expert | 1420 | 1258 |
| Humanity's Last Exam | 25.3% | — |
| SimpleQA Verified | 50.1% | — |
| Confabulations | 10.3% | — |
| Vectara Hallucination Rate | 14.7% | — |
Multimodal GPT-5 leads
GPT-5: 46.1 (#12), Mistral Small 3.1: 32.6 (#93)
| Benchmark | GPT-5 | Mistral Small 3.1 |
|---|---|---|
| LMArena Vision | 1232 | 1136 |
| GeoBench | 81% | — |
| VPCT | 66% | — |
Multilingual GPT-5 leads
GPT-5: 51.5 (#105), Mistral Small 3.1: 41.4 (#204)
| Benchmark | GPT-5 | Mistral Small 3.1 |
|---|---|---|
| LMArena Non-English | 1397 | 1255 |
| LMArena Chinese | 1423 | 1254 |
| LMArena French | 1409 | 1270 |
| LMArena German | 1415 | 1266 |
| LMArena Japanese | 1411 | 1210 |
| LMArena Korean | 1361 | 1206 |
| LMArena Russian | 1406 | 1263 |
| LMArena Spanish | 1398 | 1283 |
Instruction Following GPT-5 leads
GPT-5: 74.0 (#107), Mistral Small 3.1: 63.8 (#225)
| Benchmark | GPT-5 | Mistral Small 3.1 |
|---|---|---|
| IFEval | 87.5% | 75% |
| LMArena Instruction Following | 1388 | 1264 |
Long Context GPT-5 leads
GPT-5: 69.5 (#2), Mistral Small 3.1: 39.5 (#172)
| Benchmark | GPT-5 | Mistral Small 3.1 |
|---|---|---|
| LMArena Longer Query | 1399 | 1300 |
| Fiction.LiveBench | 97.2% | — |
Writing & Preference GPT-5 leads
GPT-5: 63.5 (#63), Mistral Small 3.1: 37.2 (#254)
| Benchmark | GPT-5 | Mistral Small 3.1 |
|---|---|---|
| LMArena Text | 1406 | 1278 |
| LMArena Creative Writing | 1365 | 1253 |
| EQ-Bench Creative Writing | 1627 | 761 |
| WildBench | 85.7% | 78.8% |
| LMArena Multi-Turn | 1426 | 1270 |
| Short-Story Creative Writing | 86% | — |
Frequently asked questions
Is GPT-5 better than Mistral Small 3.1?
GPT-5 is the stronger model overall, scoring 50.9 to 31.4 on the Noometry Index. Mistral Small 3.1 costs 8.6× less per token, which makes it the better buy when GPT-5's lead doesn't matter for your workload.
Which is cheaper, GPT-5 or Mistral Small 3.1?
Mistral Small 3.1 is cheaper. It lists at $0.35 per million input tokens and $0.56 per million output tokens; GPT-5 lists at $1.25 and $10.
Is GPT-5 or Mistral Small 3.1 better for coding?
GPT-5 scores higher on coding benchmarks: 50.7 versus 37.7 in the Noometry coding category.
Which has the bigger context window?
GPT-5 does, with 400K tokens against 128K.
How many benchmarks do GPT-5 and Mistral Small 3.1 share?
28 benchmarks have published results for both models. GPT-5 has 69 scored results on Noometry and Mistral Small 3.1 has 28.