Model comparison
Mercury 2.5 vs Mistral Small 3
Mistral Small 3 has enough public results to be ranked (#268); Mercury 2.5 does not yet, so treat this comparison as directional.
Last verified . 0 shared benchmarks.
Mistral AISummary
- The widest gap is in math, where Mercury 2.5 leads 22.4 to 15.3.
- Mistral Small 3 is cheaper at $0.05 / $0.08 per million input/output tokens, against $0.04 / $0.15 for Mercury 2.5.
- Mercury 2.5 accepts more context: 260K tokens versus 33K.
- Mistral Small 3 has downloadable open weights; the other is API-only.
Side by side
| Mercury 2.5 | Mistral Small 3 | |
|---|---|---|
| Provider | Inception | Mistral AI |
| Noometry Index | 30.2 | 30.9 |
| Released | 2026-09-08 | 2025-01-30 |
| Weights | Proprietary | Open |
| Context window | 260K | 33K |
| Max output | 66K | 16K |
| Input $ / M tokens | $0.04 | $0.05 |
| Output $ / M tokens | $0.15 | $0.08 |
| Results tracked | 2 | 24 |
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Category by category
Coding Not comparable
Mercury 2.5: —, Mistral Small 3: 36.0 (#203)
| Benchmark | Mercury 2.5 | Mistral Small 3 |
|---|---|---|
| BigCodeBench Instruct | — | 45.3% |
| LMArena Coding | — | 1246 |
| BigCodeBench Complete | — | 50.4% |
| ALE-Bench | 301.65 | — |
Reasoning Not comparable
Mercury 2.5: —, Mistral Small 3: 18.2 (#269)
| Benchmark | Mercury 2.5 | Mistral Small 3 |
|---|---|---|
| Chess Puzzles | — | 0% |
| LMArena Hard Prompts | — | 1233 |
| Epoch Capabilities Index | — | 127.06 |
Math Mercury 2.5 leads
Mercury 2.5: 22.4, Mistral Small 3: 15.3 (#290)
| Benchmark | Mercury 2.5 | Mistral Small 3 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | — | 6.7% |
| ProofBench | 3% | — |
| LMArena Math | — | 1240 |
Knowledge Not comparable
Mercury 2.5: —, Mistral Small 3: 25.0 (#258)
| Benchmark | Mercury 2.5 | Mistral Small 3 |
|---|---|---|
| GPQA Diamond | — | 47.3% |
| Confabulations | — | 25.2% |
| LMArena Expert | — | 1202 |
Multilingual Not comparable
Mercury 2.5: —, Mistral Small 3: 37.5 (#231)
| Benchmark | Mercury 2.5 | Mistral Small 3 |
|---|---|---|
| LMArena Non-English | — | 1198 |
| LMArena Chinese | — | 1204 |
| LMArena French | — | 1202 |
| LMArena German | — | 1211 |
| LMArena Japanese | — | 1111 |
| LMArena Korean | — | 1188 |
| LMArena Russian | — | 1216 |
Instruction Following Not comparable
Mercury 2.5: —, Mistral Small 3: 63.9 (#224)
| Benchmark | Mercury 2.5 | Mistral Small 3 |
|---|---|---|
| LMArena Instruction Following | — | 1214 |
Long Context Not comparable
Mercury 2.5: —, Mistral Small 3: 37.8 (#206)
| Benchmark | Mercury 2.5 | Mistral Small 3 |
|---|---|---|
| LMArena Longer Query | — | 1246 |
Writing & Preference Not comparable
Mercury 2.5: —, Mistral Small 3: 32.4 (#275)
| Benchmark | Mercury 2.5 | Mistral Small 3 |
|---|---|---|
| LMArena Text | — | 1234 |
| LMArena Creative Writing | — | 1195 |
| EQ-Bench Creative Writing | — | 707 |
| LMArena Multi-Turn | — | 1217 |
Frequently asked questions
Is Mercury 2.5 better than Mistral Small 3?
Mistral Small 3 has enough public results to be ranked (#268); Mercury 2.5 does not yet, so treat this comparison as directional.
Which is cheaper, Mercury 2.5 or Mistral Small 3?
Mistral Small 3 is cheaper. It lists at $0.05 per million input tokens and $0.08 per million output tokens; Mercury 2.5 lists at $0.04 and $0.15.
Which has the bigger context window?
Mercury 2.5 does, with 260K tokens against 33K.
How many benchmarks do Mercury 2.5 and Mistral Small 3 share?
0 benchmarks have published results for both models. Mercury 2.5 has 2 scored results on Noometry and Mistral Small 3 has 24.