Model comparison
Mercury vs Mistral Small 3.1
Mercury is the stronger model overall, scoring 37.6 to 31.7 on the Noometry Index.
Last verified . 8 shared benchmarks.
Mistral AISummary
- They share 8 benchmarks with published results for both. Mercury scores higher in 4 categories and Mistral Small 3.1 in 2 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Mercury leads 46.2 to 37.0.
- Mistral Small 3.1 has downloadable open weights; the other is API-only.
Side by side
| Mercury | Mistral Small 3.1 | |
|---|---|---|
| Provider | Inception | Mistral AI |
| Noometry Index | 37.6 | 31.7 |
| Released | — | 2025-03-17 |
| Weights | Proprietary | Open |
| Context window | — | 128K |
| Max output | — | 102K |
| Input $ / M tokens | — | $0.35 |
| Output $ / M tokens | — | $0.56 |
| Results tracked | 9 | 28 |
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Category by category
Coding Too close to call
Mercury: 38.7 (#170), Mistral Small 3.1: 38.3 (#179)
| Benchmark | Mercury | Mistral Small 3.1 |
|---|---|---|
| LMArena Coding | 1322 | 1309 |
Reasoning Mistral Small 3.1 leads
Mercury: 17.5 (#293), Mistral Small 3.1: 19.7 (#254)
| Benchmark | Mercury | Mistral Small 3.1 |
|---|---|---|
| LMArena Hard Prompts | 1285 | 1278 |
| Kagi LLM Benchmark | 21.6% | — |
| Chess Puzzles | — | 1% |
| Epoch Capabilities Index | — | 127.48 |
Math Not comparable
Mercury: —, Mistral Small 3.1: 14.7 (#301)
| Benchmark | Mercury | Mistral Small 3.1 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 3.9% |
| Omni-MATH | — | 24.8% |
| LMArena Math | — | 1262 |
Knowledge Not comparable
Mercury: —, Mistral Small 3.1: 22.6 (#271)
| Benchmark | Mercury | Mistral Small 3.1 |
|---|---|---|
| GPQA Diamond | — | 41.9% |
| MMLU-Pro | — | 61% |
| GPQA (HELM) | — | 39.2% |
| LMArena Expert | — | 1257 |
Multimodal Not comparable
Mercury: —, Mistral Small 3.1: 33.2 (#99)
| Benchmark | Mercury | Mistral Small 3.1 |
|---|---|---|
| LMArena Vision | — | 1136 |
Multilingual Too close to call
Mercury: 41.6 (#206), Mistral Small 3.1: 41.2 (#209)
| Benchmark | Mercury | Mistral Small 3.1 |
|---|---|---|
| LMArena Non-English | 1260 | 1255 |
| LMArena Chinese | — | 1253 |
| LMArena French | — | 1273 |
| LMArena German | — | 1266 |
| LMArena Japanese | — | 1208 |
| LMArena Korean | — | 1206 |
| LMArena Russian | — | 1263 |
| LMArena Spanish | — | 1283 |
Instruction Following Mercury leads
Mercury: 65.2 (#224), Mistral Small 3.1: 63.6 (#230)
| Benchmark | Mercury | Mistral Small 3.1 |
|---|---|---|
| LMArena Instruction Following | 1239 | 1264 |
| IFEval | — | 75% |
Long Context Mistral Small 3.1 leads
Mercury: 38.4 (#198), Mistral Small 3.1: 39.5 (#178)
| Benchmark | Mercury | Mistral Small 3.1 |
|---|---|---|
| LMArena Longer Query | 1266 | 1299 |
Writing & Preference Mercury leads
Mercury: 46.2 (#221), Mistral Small 3.1: 37.0 (#259)
| Benchmark | Mercury | Mistral Small 3.1 |
|---|---|---|
| LMArena Text | 1282 | 1277 |
| LMArena Creative Writing | 1191 | 1253 |
| LMArena Multi-Turn | 1282 | 1270 |
| EQ-Bench Creative Writing | — | 761 |
| WildBench | — | 78.8% |
Frequently asked questions
Is Mercury better than Mistral Small 3.1?
Mercury is the stronger model overall, scoring 37.6 to 31.7 on the Noometry Index.
Is Mercury or Mistral Small 3.1 better for coding?
They score almost the same on coding (38.7 vs 38.3); test both on your own repository before choosing.
How many benchmarks do Mercury and Mistral Small 3.1 share?
8 benchmarks have published results for both models. Mercury has 9 scored results on Noometry and Mistral Small 3.1 has 28.