Claude Opus 4.1 vs Mistral Medium 3.1
Claude Opus 4.1 leads Mistral Medium 3.1 on the Artificial Analysis Intelligence Index, 22.8 to 9.2, and Mistral Medium 3.1 costs 37.5x less per output token ($2.00 vs $75.00 per million). Updated October 21, 2026; 49 benchmarks have a result for both.
Claude Opus 4.1 or Mistral Medium 3.1: which to pick
Neither model has a coding score yet, so the two cannot be ranked on coding.
Pick Claude Opus 4.1 for a larger context window (200K against 131K tokens) and work measured by LMArena Text: science or LMArena Text: medicine and healthcare, where it leads.
- Shared results
- 49
- Claude Opus 4.1 only
- 24
- Mistral Medium 3.1 only
- 25
- Like-for-like categories
- 7 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
Claude Opus 4.1
Claude Opus 4.1 leads, 22.8 against 9.2.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Mistral Medium 3.1 has a AA Agentic Index result, 1.9.
Directional only
Reasoning
GPQA Diamond
No call
Only Claude Opus 4.1 has a GPQA Diamond result, 76.3%.
Directional only
Math
AIME
Claude Opus 4.1
Claude Opus 4.1 leads, 78.2% against 42.3%.
Same board, both measured
Knowledge
MMLU Pro
Claude Opus 4.1
Claude Opus 4.1 leads, 87.9% against 75.3%.
Same board, both measured
Web design
Design Arena: websites
Claude Opus 4.1
Claude Opus 4.1 leads, 1177 against 1133.
Same board, both measured
Long documents
Listed context window
Claude Opus 4.1
Claude Opus 4.1 takes 200K tokens against 131K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Mistral Medium 3.1
Claude Opus 4.1 $0.052, Mistral Medium 3.1 $0.0014 per turn.
List prices
At a glance
- Coding index
- Claude Opus 4.1 not benchmarked, Mistral Medium 3.1 not benchmarked.
- Widest category
- Intelligence, 13.6 points apart on average over 1 shared benchmark.
- Widest single gap
- AIME: Claude Opus 4.1 78.2% against Mistral Medium 3.1 42.3%, 35.9 points apart on a 0 to 100 scale.
- Output price
- Claude Opus 4.1 $75.00 against Mistral Medium 3.1 $2.00 per million output tokens, 37.5x apart.
- Context window
- Claude Opus 4.1 takes 200K tokens, Mistral Medium 3.1 131K.
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 | Claude Opus 4.1 | Bars | Mistral Medium 3.1 | Ties |
|---|---|---|---|---|
| Coding | 3 | 0 | ||
| Intelligence | 1 | 0 | ||
| Reasoning | 4 | 0 | ||
| Math | 5 | 0 | ||
| Knowledge | 5 | 4 | ||
| Web design | 8 | 0 | ||
| General | 11 | 8 | ||
| All shared boards | 37 | 12 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index30
| Benchmark | Claude Opus 4.1 | Mistral Medium 3.1 | Leader |
|---|---|---|---|
| LMArena WebDev | 1390 | Not measured | Only Claude Opus 4.1 measured |
| AA Coding Index | Not measured | 20.5 | Only Mistral Medium 3.1 measured |
| LiveCodeBench (Vals AI) | 66.5% | 44.8% | Claude Opus 4.1 |
| LiveCodeBench (Artificial Analysis run) | Not measured | 40.6% | Only Mistral Medium 3.1 measured |
| SciCode | Not measured | 32.4% | Only Mistral Medium 3.1 measured |
| Terminal-Bench Hard (Artificial Analysis run) | Not measured | 10.6% | Only Mistral Medium 3.1 measured |
| Terminal-Bench | 38.0% | Not measured | Only Claude Opus 4.1 measured |
| WeirdML | 45.9% | Not measured | Only Claude Opus 4.1 measured |
| Cybench | 42.0% | Not measured | Only Claude Opus 4.1 measured |
| ALE-Bench | Not measured | 210.2 | Only Mistral Medium 3.1 measured |
| LMArena Text: coding | 1479 | 1433 | Claude Opus 4.1 |
| LMArena Text: software and IT | 1456 | 1436 | Claude Opus 4.1 |
| LMArena WebDev: HTML | 1399 | Not measured | Only Claude Opus 4.1 measured |
| SciCode | 4.6% | Not measured | Only Claude Opus 4.1 measured |
| Neither model has a result on the other 25 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Claude Opus 4.1 | Mistral Medium 3.1 | Leader |
|---|---|---|---|
| AA Intelligence Index | 22.8 | 9.2 | Claude Opus 4.1 |
| Epoch Capabilities Index | 144.1 | Not measured | Only Claude Opus 4.1 measured |
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index5 boards, none shared
| Benchmark | Claude Opus 4.1 | Mistral Medium 3.1 | Leader |
|---|---|---|---|
| AA Agentic Index | Not measured | 1.9 | Only Mistral Medium 3.1 measured |
| τ²-Bench Telecom | Not measured | 40.6% | Only Mistral Medium 3.1 measured |
| METR time horizons | 66.8% | Not measured | Only Claude Opus 4.1 measured |
| GDPval | 43.6% | Not measured | Only Claude Opus 4.1 measured |
| DeepResearch Bench | 48.3% | Not measured | Only Claude Opus 4.1 measured |
| Neither model has a result on the other 36 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index40
| Benchmark | Claude Opus 4.1 | Mistral Medium 3.1 | Leader |
|---|---|---|---|
| GPQA Diamond | 76.3% | Not measured | Only Claude Opus 4.1 measured |
| MMMU Pro (Vals AI) | 77.5% | 63.0% | Claude Opus 4.1 |
| GPQA Diamond (Artificial Analysis run) | Not measured | 58.8% | Only Mistral Medium 3.1 measured |
| Humanity's Last Exam (Artificial Analysis run) | Not measured | 4.7% | Only Mistral Medium 3.1 measured |
| GPQA Diamond (Epoch AI run) | 77.3% | Not measured | Only Claude Opus 4.1 measured |
| SimpleBench | 60.0% | Not measured | Only Claude Opus 4.1 measured |
| Mystery game puzzles | 21.0% | Not measured | Only Claude Opus 4.1 measured |
| EBR-bench | 7.9% | Not measured | Only Claude Opus 4.1 measured |
| VPCT | 35.0% | Not measured | Only Claude Opus 4.1 measured |
| LMArena Text: hard prompts | 1442 | 1426 | Claude Opus 4.1 |
| LMArena Text: expert | 1438 | 1408 | Claude Opus 4.1 |
| LMArena Text: hard prompts in English | 1451 | 1435 | Claude Opus 4.1 |
| LMArena Vision: diagrams | Not measured | 1175 | Only Mistral Medium 3.1 measured |
| LMArena Vision: homework | Not measured | 1165 | Only Mistral Medium 3.1 measured |
| Neither model has a result on the other 8 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index50
| Benchmark | Claude Opus 4.1 | Mistral Medium 3.1 | Leader |
|---|---|---|---|
| AIME | 78.2% | 42.3% | Claude Opus 4.1 |
| MATH 500 (Vals AI) | 95.4% | 87.0% | Claude Opus 4.1 |
| MGSM (Vals AI) | 94.4% | 90.9% | Claude Opus 4.1 |
| AA Math Index | Not measured | 38.3 | Only Mistral Medium 3.1 measured |
| AIME 2025 (Artificial Analysis run) | Not measured | 38.3% | Only Mistral Medium 3.1 measured |
| OTIS Mock AIME | 68.9% | Not measured | Only Claude Opus 4.1 measured |
| FrontierMath, tiers 1 to 3 | 12.6% | Not measured | Only Claude Opus 4.1 measured |
| FrontierMath, tier 4 | 2.4% | Not measured | Only Claude Opus 4.1 measured |
| LMArena Text: math | 1431 | 1408 | Claude Opus 4.1 |
| LMArena Text: mathematical work | 1434 | 1412 | Claude Opus 4.1 |
| Neither model has a result on the other 3 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index54
| Benchmark | Claude Opus 4.1 | Mistral Medium 3.1 | Leader |
|---|---|---|---|
| MMLU Pro | 87.9% | 75.3% | Claude Opus 4.1 |
| LegalBench (Vals AI) | 83.5% | 62.0% | Claude Opus 4.1 |
| CorpFin (Vals AI) | Not measured | 50.7% | Only Mistral Medium 3.1 measured |
| TaxEval (Vals AI) | 73.7% | 70.3% | Claude Opus 4.1 |
| MortgageTax (Vals AI) | 61.1% | 36.5% | Claude Opus 4.1 |
| MedQA (Vals AI) | 93.6% | 78.2% | Claude Opus 4.1 |
| MedCode (Vals AI) | 47.2% | Not measured | Only Claude Opus 4.1 measured |
| MMLU Pro (Artificial Analysis run) | Not measured | 68.3% | Only Mistral Medium 3.1 measured |
| LMArena Text: science | 1422 | 1444 | Mistral Medium 3.1 |
| LMArena Text: medicine and healthcare | 1416 | 1449 | Mistral Medium 3.1 |
| LMArena Text: legal and government | 1421 | 1439 | Mistral Medium 3.1 |
| LMArena Text: business and finance | 1406 | 1418 | Mistral Medium 3.1 |
| FACTS Benchmark Suite | 40.4% | Not measured | Only Claude Opus 4.1 measured |
| Neither model has a result on the other 5 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index80
| Benchmark | Claude Opus 4.1 | Mistral Medium 3.1 | Leader |
|---|---|---|---|
| Design Arena: websites | 1177 | 1133 | Claude Opus 4.1 |
| Design Arena: UI components | 1165 | 1100 | Claude Opus 4.1 |
| Design Arena: game dev | 1171 | 1074 | Claude Opus 4.1 |
| Design Arena: data viz | 1166 | 1144 | Claude Opus 4.1 |
| Design Arena: 3D | 1153 | 1081 | Claude Opus 4.1 |
| Design Arena: all code categories | 1171 | 1120 | Claude Opus 4.1 |
| Design Arena: SVG | 1152 | 993 | Claude Opus 4.1 |
| Design Arena: ASCII art | 1167 | 997 | Claude Opus 4.1 |
| Neither model has a result on the other 1 board here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index118
| Benchmark | Claude Opus 4.1 | Mistral Medium 3.1 | Leader |
|---|---|---|---|
| SAGE (Vals AI) | 31.4% | Not measured | Only Claude Opus 4.1 measured |
| MedScribe (Vals AI) | 73.9% | Not measured | Only Claude Opus 4.1 measured |
| IFBench | Not measured | 39.8% | Only Mistral Medium 3.1 measured |
| Long context reasoning (AA-LCR) | Not measured | 42.7% | Only Mistral Medium 3.1 measured |
| DTBench | 80.0% | 67.5% | Claude Opus 4.1 |
| LMCA | 37.1% | 19.1% | Claude Opus 4.1 |
| Creative writing (Lech Mazur) | 84.7% | Not measured | Only Claude Opus 4.1 measured |
| LMArena Text | 1419 | 1424 | Mistral Medium 3.1 |
| LMArena Text: instruction following | 1435 | 1398 | Claude Opus 4.1 |
| LMArena Text: creative writing | 1412 | 1391 | Claude Opus 4.1 |
| LMArena Vision | Not measured | 1172 | Only Mistral Medium 3.1 measured |
| LMArena Text: English | 1433 | 1438 | Mistral Medium 3.1 |
| LMArena Text: non-English | 1405 | 1408 | Mistral Medium 3.1 |
| LMArena Text: Chinese | 1427 | 1447 | Mistral Medium 3.1 |
| LMArena Text: German | 1413 | 1432 | Mistral Medium 3.1 |
| LMArena Text: Japanese | 1377 | 1379 | Mistral Medium 3.1 |
| LMArena Text: Korean | 1381 | 1380 | Claude Opus 4.1 |
| LMArena Text: French | 1433 | 1460 | Mistral Medium 3.1 |
| LMArena Text: Spanish | 1448 | 1433 | Claude Opus 4.1 |
| LMArena Text: Russian | 1422 | 1411 | Claude Opus 4.1 |
| LMArena Text: Polish | 1413 | 1430 | Mistral Medium 3.1 |
| LMArena Text: multi-turn | 1444 | 1418 | Claude Opus 4.1 |
| LMArena Text: longer queries | 1455 | 1406 | Claude Opus 4.1 |
| LMArena Text: writing and language | 1418 | 1395 | Claude Opus 4.1 |
| LMArena Text: entertainment and media | 1398 | 1390 | Claude Opus 4.1 |
| LMArena Vision: English | Not measured | 1179 | Only Mistral Medium 3.1 measured |
| LMArena Vision: Chinese | Not measured | 1190 | Only Mistral Medium 3.1 measured |
| LMArena Vision: reading text | Not measured | 1175 | Only Mistral Medium 3.1 measured |
| LMArena Vision: humor | Not measured | 1168 | Only Mistral Medium 3.1 measured |
| LMArena Vision: captioning | Not measured | 1145 | Only Mistral Medium 3.1 measured |
| LMArena Vision: recognizing things | Not measured | 1147 | Only Mistral Medium 3.1 measured |
| LMArena Vision: creative writing | Not measured | 1200 | Only Mistral Medium 3.1 measured |
| Neither model has a result on the other 14 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Claude Opus 4.1 | Mistral Medium 3.1 | 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 Medium 3.1 costs less
Repository review
50K input + 3K output tokens
Mistral Medium 3.1 costs less
Agent loop
200K input + 10K output tokens
Mistral Medium 3.1 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 | Anthropic Claude Opus 4.1 | Mistral Medium 3.1 |
|---|---|---|
| Maker | Anthropic | Mistral AI |
| Weights | No public weights listed | No public weights listed |
| Released | August 5, 2025 | August 13, 2025 |
| Context window | 200K | 131K |
| Input $/Mtok | $15.00 | $0.40 |
| Output $/Mtok | $75.00 | $2.00 |
| Coding index | Not benchmarked | Not benchmarked |
| Independent measurements behind it | 1 | 0 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Claude Opus 4.1 better than Mistral Medium 3.1 for coding?
Neither model has a coding score yet, so the two cannot be ranked on coding. Pick Claude Opus 4.1 for a larger context window (200K against 131K tokens) and work measured by LMArena Text: science or LMArena Text: medicine and healthcare, where it leads.
Which is cheaper, Claude Opus 4.1 or Mistral Medium 3.1?
Claude Opus 4.1 costs $15.00 per million input tokens and $75.00 per million output tokens; Mistral Medium 3.1 costs $0.40 and $2.00. Cost per solved task is known for neither of them.
Which has the bigger context window, Claude Opus 4.1 or Mistral Medium 3.1?
Claude Opus 4.1, with 200K tokens against 131K.
How many benchmarks is the Claude Opus 4.1 vs Mistral Medium 3.1 comparison based on?
49 benchmarks have a result for both models as of October 21, 2026. Claude Opus 4.1's coding index rests on 1 independent benchmark and Mistral Medium 3.1's on 0. Where only one model has a result, the page says so instead of naming a winner.