Mistral Small 3.1 24B vs Qwen3.5 397B A17B
Mistral Small 3.1 24B costs 4.2x less per output token than Qwen3.5 397B A17B ($0.555 vs $2.34 per million). Updated October 22, 2026; 38 benchmarks have a result for both.
Mistral Small 3.1 24B or Qwen3.5 397B A17B: which to pick
Neither model has a coding score yet, so the two cannot be ranked on coding.
Pick Mistral Small 3.1 24B for output tokens 4.2x cheaper ($0.555 vs $2.34 per million) and work measured by LMArena Text: coding or LMArena Text: software and IT, where it leads.
- Shared results
- 38
- Mistral Small 3.1 24B only
- 0
- Qwen3.5 397B A17B only
- 28
- Like-for-like categories
- 5 of 9
Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.
Which one for your work
Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.
Coding
Vibe Coding Index, six public coding benchmarks
No call
Neither has a coding score yet.
One side not measured
Intelligence
AA Intelligence Index
No call
Only Qwen3.5 397B A17B has a AA Intelligence Index result, 21.4.
Directional only
Web design
Design Arena: websites
No call
Only Qwen3.5 397B A17B has a Design Arena: websites result, 1190.
Directional only
Long documents
Listed context window
Qwen3.5 397B A17B
Qwen3.5 397B A17B takes 262K tokens against 128K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Mistral Small 3.1 24B
Mistral Small 3.1 24B $0.0006, Qwen3.5 397B A17B $0.0016 per turn.
List prices
At a glance
- Coding index
- Mistral Small 3.1 24B not benchmarked, Qwen3.5 397B A17B not benchmarked.
- Widest category
- Math, 31.2 points apart on average over 2 shared benchmarks.
- Widest single gap
- LMArena Text: Chinese: Mistral Small 3.1 24B 1253 against Qwen3.5 397B A17B 1498, 41.0 points apart on a 0 to 100 scale.
- Output price
- Mistral Small 3.1 24B $0.555 against Qwen3.5 397B A17B $2.34 per million output tokens, 4.2x apart.
- Context window
- Mistral Small 3.1 24B takes 128K tokens, Qwen3.5 397B A17B 262K.
Benchmark by benchmark
First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.
| Category | Mistral Small 3.1 24B | Bars | Qwen3.5 397B A17B | Ties |
|---|---|---|---|---|
| Coding | 0 | 2 | ||
| Reasoning | 0 | 5 | ||
| Math | 0 | 2 | ||
| Knowledge | 0 | 4 | ||
| General | 0 | 25 | ||
| All shared boards | 0 | 38 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index02
| Benchmark | Mistral Small 3.1 24B | Qwen3.5 397B A17B | Leader |
|---|---|---|---|
| LMArena WebDev | Not measured | 1400 | Only Qwen3.5 397B A17B measured |
| SciCode | Not measured | 44.8% | Only Qwen3.5 397B A17B measured |
| Terminal-Bench Hard (Artificial Analysis run) | Not measured | 40.9% | Only Qwen3.5 397B A17B measured |
| ALE-Bench | Not measured | 621.9 | Only Qwen3.5 397B A17B measured |
| LMArena Text: coding | 1309 | 1464 | Qwen3.5 397B A17B |
| LMArena Text: software and IT | 1301 | 1463 | Qwen3.5 397B A17B |
| LMArena WebDev: React | Not measured | 1388 | Only Qwen3.5 397B A17B measured |
| LMArena WebDev: HTML | Not measured | 1410 | Only Qwen3.5 397B A17B measured |
| Neither model has a result on the other 35 boards here | |||
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared
| Benchmark | Mistral Small 3.1 24B | Qwen3.5 397B A17B | Leader |
|---|---|---|---|
| AA Intelligence Index | Not measured | 21.4 | Only Qwen3.5 397B A17B measured |
| Epoch Capabilities Index | Not measured | 146.8 | Only Qwen3.5 397B A17B measured |
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared
| Benchmark | Mistral Small 3.1 24B | Qwen3.5 397B A17B | Leader |
|---|---|---|---|
| τ²-Bench Telecom | Not measured | 95.6% | Only Qwen3.5 397B A17B measured |
| APEX-Agents | Not measured | 24.9% | Only Qwen3.5 397B A17B measured |
| Neither model has a result on the other 40 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index05
| Benchmark | Mistral Small 3.1 24B | Qwen3.5 397B A17B | Leader |
|---|---|---|---|
| GPQA Diamond (Artificial Analysis run) | Not measured | 89.3% | Only Qwen3.5 397B A17B measured |
| Humanity's Last Exam (Artificial Analysis run) | Not measured | 29.0% | Only Qwen3.5 397B A17B measured |
| GPQA Diamond (Epoch AI run) | Not measured | 86.4% | Only Qwen3.5 397B A17B measured |
| Mystery game puzzles | Not measured | 18.0% | Only Qwen3.5 397B A17B measured |
| LMArena Text: hard prompts | 1278 | 1448 | Qwen3.5 397B A17B |
| LMArena Text: expert | 1257 | 1462 | Qwen3.5 397B A17B |
| LMArena Text: hard prompts in English | 1290 | 1450 | Qwen3.5 397B A17B |
| LMArena Vision: diagrams | 1119 | 1277 | Qwen3.5 397B A17B |
| LMArena Vision: homework | 1158 | 1292 | Qwen3.5 397B A17B |
| Neither model has a result on the other 14 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index02
| Benchmark | Mistral Small 3.1 24B | Qwen3.5 397B A17B | Leader |
|---|---|---|---|
| OTIS Mock AIME | Not measured | 88.9% | Only Qwen3.5 397B A17B measured |
| FrontierMath, tiers 1 to 3 | Not measured | 31.2% | Only Qwen3.5 397B A17B measured |
| LMArena Text: math | 1261 | 1453 | Qwen3.5 397B A17B |
| LMArena Text: mathematical work | 1271 | 1454 | Qwen3.5 397B A17B |
| MathArena | Not measured | 19.2% | Only Qwen3.5 397B A17B measured |
| Neither model has a result on the other 9 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index04
| Benchmark | Mistral Small 3.1 24B | Qwen3.5 397B A17B | Leader |
|---|---|---|---|
| LMArena Text: science | 1265 | 1457 | Qwen3.5 397B A17B |
| LMArena Text: medicine and healthcare | 1267 | 1455 | Qwen3.5 397B A17B |
| LMArena Text: legal and government | 1271 | 1441 | Qwen3.5 397B A17B |
| LMArena Text: business and finance | 1257 | 1435 | Qwen3.5 397B A17B |
| Neither model has a result on the other 16 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index7 boards, none shared
| Benchmark | Mistral Small 3.1 24B | Qwen3.5 397B A17B | Leader |
|---|---|---|---|
| Design Arena: websites | Not measured | 1190 | Only Qwen3.5 397B A17B measured |
| Design Arena: UI components | Not measured | 1161 | Only Qwen3.5 397B A17B measured |
| Design Arena: game dev | Not measured | 1140 | Only Qwen3.5 397B A17B measured |
| Design Arena: data viz | Not measured | 1175 | Only Qwen3.5 397B A17B measured |
| Design Arena: 3D | Not measured | 1160 | Only Qwen3.5 397B A17B measured |
| Design Arena: all code categories | Not measured | 1179 | Only Qwen3.5 397B A17B measured |
| Design Arena: SVG | Not measured | 1139 | Only Qwen3.5 397B A17B measured |
| Neither model has a result on the other 2 boards here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index025
| Benchmark | Mistral Small 3.1 24B | Qwen3.5 397B A17B | Leader |
|---|---|---|---|
| IFBench | Not measured | 78.8% | Only Qwen3.5 397B A17B measured |
| Long context reasoning (AA-LCR) | Not measured | 77.3% | Only Qwen3.5 397B A17B measured |
| DTBench | Not measured | 87.5% | Only Qwen3.5 397B A17B measured |
| LMCA | Not measured | 37.9% | Only Qwen3.5 397B A17B measured |
| LMArena Text | 1277 | 1437 | Qwen3.5 397B A17B |
| LMArena Text: instruction following | 1263 | 1424 | Qwen3.5 397B A17B |
| LMArena Text: creative writing | 1252 | 1402 | Qwen3.5 397B A17B |
| LMArena Vision | 1136 | 1262 | Qwen3.5 397B A17B |
| LMArena Text: English | 1295 | 1443 | Qwen3.5 397B A17B |
| LMArena Text: non-English | 1255 | 1430 | Qwen3.5 397B A17B |
| LMArena Text: Chinese | 1253 | 1498 | Qwen3.5 397B A17B |
| LMArena Text: German | 1266 | 1445 | Qwen3.5 397B A17B |
| LMArena Text: Japanese | 1208 | 1429 | Qwen3.5 397B A17B |
| LMArena Text: Korean | 1207 | 1384 | Qwen3.5 397B A17B |
| LMArena Text: French | 1273 | 1462 | Qwen3.5 397B A17B |
| LMArena Text: Spanish | 1284 | 1441 | Qwen3.5 397B A17B |
| LMArena Text: Russian | 1263 | 1430 | Qwen3.5 397B A17B |
| LMArena Text: Polish | 1242 | 1447 | Qwen3.5 397B A17B |
| LMArena Text: multi-turn | 1270 | 1446 | Qwen3.5 397B A17B |
| LMArena Text: longer queries | 1299 | 1441 | Qwen3.5 397B A17B |
| LMArena Text: writing and language | 1268 | 1415 | Qwen3.5 397B A17B |
| LMArena Text: entertainment and media | 1250 | 1399 | Qwen3.5 397B A17B |
| LMArena Vision: English | 1157 | 1268 | Qwen3.5 397B A17B |
| LMArena Vision: Chinese | 1155 | 1314 | Qwen3.5 397B A17B |
| LMArena Vision: reading text | 1132 | 1271 | Qwen3.5 397B A17B |
| LMArena Vision: humor | 1142 | 1262 | Qwen3.5 397B A17B |
| LMArena Vision: captioning | 1153 | 1230 | Qwen3.5 397B A17B |
| LMArena Vision: recognizing things | 1155 | 1265 | Qwen3.5 397B A17B |
| LMArena Vision: creative writing | 1123 | 1260 | Qwen3.5 397B A17B |
| Neither model has a result on the other 19 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Mistral Small 3.1 24B | Qwen3.5 397B A17B | Leader |
|---|---|---|---|
| Neither model has a result on 5 boards here | |||
What each workload costs
Three fixed token mixes at each model's listed price, so per-token rates become a bill.
Chat turn
1K input + 500 output tokens
Mistral Small 3.1 24B costs less
Repository review
50K input + 3K output tokens
Mistral Small 3.1 24B costs less
Agent loop
200K input + 10K output tokens
Mistral Small 3.1 24B costs less
Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.
Specification differences
The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.
| Specification | Mistral Small 3.1 24B | Qwen3.5 397B A17B |
|---|---|---|
| Maker | Mistral AI | Qwen |
| Weights | Open weights | Open weights |
| Released | March 17, 2025 | February 16, 2026 |
| Context window | 128K | 262K |
| Input $/Mtok | $0.351 | $0.39 |
| Output $/Mtok | $0.555 | $2.34 |
| Coding index | Not benchmarked | Not benchmarked |
| Independent measurements behind it | 0 | 1 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Mistral Small 3.1 24B better than Qwen3.5 397B A17B for coding?
Neither model has a coding score yet, so the two cannot be ranked on coding. Pick Mistral Small 3.1 24B for output tokens 4.2x cheaper ($0.555 vs $2.34 per million) and work measured by LMArena Text: coding or LMArena Text: software and IT, where it leads.
Which is cheaper, Mistral Small 3.1 24B or Qwen3.5 397B A17B?
Mistral Small 3.1 24B costs $0.351 per million input tokens and $0.555 per million output tokens; Qwen3.5 397B A17B costs $0.39 and $2.34. Cost per solved task is known for neither of them.
Which has the bigger context window, Mistral Small 3.1 24B or Qwen3.5 397B A17B?
Qwen3.5 397B A17B, with 262K tokens against 128K.
How many benchmarks is the Mistral Small 3.1 24B vs Qwen3.5 397B A17B comparison based on?
38 benchmarks have a result for both models as of October 22, 2026. Mistral Small 3.1 24B's coding index rests on 0 independent benchmarks and Qwen3.5 397B A17B's on 1. Where only one model has a result, the page says so instead of naming a winner.