Mistral Medium 3.1 vs Beam 1.0 501B A23B
Beam 1.0 501B A23B costs 1.8x less per output token than Mistral Medium 3.1 ($1.10 vs $2.00 per million). Updated October 22, 2026; 25 benchmarks have a result for both.
Mistral Medium 3.1 or Beam 1.0 501B A23B: which to pick
Neither model has a coding score yet, so the two cannot be ranked on coding.
Pick Mistral Medium 3.1 for work measured by LMArena Text: coding or LMArena Text: software and IT, where it leads.
- Shared results
- 25
- Mistral Medium 3.1 only
- 49
- Beam 1.0 501B A23B only
- 3
- Like-for-like categories
- 6 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 Mistral Medium 3.1 has a AA Intelligence Index result, 9.2.
Directional only
Agentic work
AA Agentic Index
No call
Only Mistral Medium 3.1 has a AA Agentic Index result, 1.9.
Directional only
Math
AIME
No call
Only Mistral Medium 3.1 has a AIME result, 42.3%.
Directional only
Knowledge
MMLU Pro
No call
Only Mistral Medium 3.1 has a MMLU Pro result, 75.3%.
Directional only
Web design
Design Arena: websites
Beam 1.0 501B A23B
Beam 1.0 501B A23B leads, 1250 against 1132.
Same board, both measured
Long documents
Listed context window
Beam 1.0 501B A23B
Beam 1.0 501B A23B takes 1.05M tokens against 131K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Beam 1.0 501B A23B
Mistral Medium 3.1 $0.0014, Beam 1.0 501B A23B $0.0009 per turn.
List prices
At a glance
- Coding index
- Mistral Medium 3.1 not benchmarked, Beam 1.0 501B A23B not benchmarked.
- Widest category
- Web design, 16.8 points apart on average over 2 shared benchmarks.
- Widest single gap
- Design Arena: game dev: Mistral Medium 3.1 1073 against Beam 1.0 501B A23B 1224, 18.9 points apart on a 0 to 100 scale.
- Output price
- Mistral Medium 3.1 $2.00 against Beam 1.0 501B A23B $1.10 per million output tokens, 1.8x apart.
- Context window
- Mistral Medium 3.1 takes 131K tokens, Beam 1.0 501B A23B 1.05M.
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 Medium 3.1 | Bars | Beam 1.0 501B A23B | Ties |
|---|---|---|---|---|
| Coding | 0 | 2 | ||
| Reasoning | 0 | 3 | ||
| Math | 0 | 2 | ||
| Knowledge | 3 | 1 | ||
| Web design | 0 | 2 | ||
| General | 4 | 8 | ||
| All shared boards | 7 | 18 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index02
| Benchmark | Mistral Medium 3.1 | Beam 1.0 501B A23B | Leader |
|---|---|---|---|
| LMArena WebDev | Not measured | 1437 | Only Beam 1.0 501B A23B measured |
| AA Coding Index | 20.5 | Not measured | Only Mistral Medium 3.1 measured |
| LiveCodeBench (Vals AI) | 44.8% | Not measured | Only Mistral Medium 3.1 measured |
| LiveCodeBench (Artificial Analysis run) | 40.6% | Not measured | Only Mistral Medium 3.1 measured |
| SciCode | 32.4% | Not measured | Only Mistral Medium 3.1 measured |
| Terminal-Bench Hard (Artificial Analysis run) | 10.6% | Not measured | Only Mistral Medium 3.1 measured |
| ALE-Bench | 210.2 | Not measured | Only Mistral Medium 3.1 measured |
| LMArena Text: coding | 1433 | 1473 | Beam 1.0 501B A23B |
| LMArena Text: software and IT | 1436 | 1461 | Beam 1.0 501B A23B |
| LMArena WebDev: React | Not measured | 1443 | Only Beam 1.0 501B A23B measured |
| LMArena WebDev: HTML | Not measured | 1436 | Only Beam 1.0 501B A23B measured |
| Neither model has a result on the other 28 boards here | |||
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index1 board, none shared
| Benchmark | Mistral Medium 3.1 | Beam 1.0 501B A23B | Leader |
|---|---|---|---|
| AA Intelligence Index | 9.2 | Not measured | Only Mistral Medium 3.1 measured |
| Neither model has a result on the other 1 board here | |||
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared
| Benchmark | Mistral Medium 3.1 | Beam 1.0 501B A23B | Leader |
|---|---|---|---|
| AA Agentic Index | 1.9 | Not measured | Only Mistral Medium 3.1 measured |
| τ²-Bench Telecom | 40.6% | Not measured | Only Mistral Medium 3.1 measured |
| Neither model has a result on the other 39 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index03
| Benchmark | Mistral Medium 3.1 | Beam 1.0 501B A23B | Leader |
|---|---|---|---|
| MMMU Pro (Vals AI) | 63.0% | Not measured | Only Mistral Medium 3.1 measured |
| GPQA Diamond (Artificial Analysis run) | 58.8% | Not measured | Only Mistral Medium 3.1 measured |
| Humanity's Last Exam (Artificial Analysis run) | 4.7% | Not measured | Only Mistral Medium 3.1 measured |
| LMArena Text: hard prompts | 1426 | 1442 | Beam 1.0 501B A23B |
| LMArena Text: expert | 1408 | 1447 | Beam 1.0 501B A23B |
| LMArena Text: hard prompts in English | 1435 | 1451 | Beam 1.0 501B A23B |
| LMArena Vision: diagrams | 1175 | Not measured | Only Mistral Medium 3.1 measured |
| LMArena Vision: homework | 1165 | Not measured | Only Mistral Medium 3.1 measured |
| 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 Medium 3.1 | Beam 1.0 501B A23B | Leader |
|---|---|---|---|
| AIME | 42.3% | Not measured | Only Mistral Medium 3.1 measured |
| MATH 500 (Vals AI) | 87.0% | Not measured | Only Mistral Medium 3.1 measured |
| MGSM (Vals AI) | 90.9% | Not measured | Only Mistral Medium 3.1 measured |
| AA Math Index | 38.3 | Not measured | Only Mistral Medium 3.1 measured |
| AIME 2025 (Artificial Analysis run) | 38.3% | Not measured | Only Mistral Medium 3.1 measured |
| LMArena Text: math | 1408 | 1459 | Beam 1.0 501B A23B |
| LMArena Text: mathematical work | 1412 | 1475 | Beam 1.0 501B A23B |
| Neither model has a result on the other 6 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index31
| Benchmark | Mistral Medium 3.1 | Beam 1.0 501B A23B | Leader |
|---|---|---|---|
| MMLU Pro | 75.3% | Not measured | Only Mistral Medium 3.1 measured |
| LegalBench (Vals AI) | 62.0% | Not measured | Only Mistral Medium 3.1 measured |
| CorpFin (Vals AI) | 50.7% | Not measured | Only Mistral Medium 3.1 measured |
| TaxEval (Vals AI) | 70.3% | Not measured | Only Mistral Medium 3.1 measured |
| MortgageTax (Vals AI) | 36.5% | Not measured | Only Mistral Medium 3.1 measured |
| MedQA (Vals AI) | 78.2% | Not measured | Only Mistral Medium 3.1 measured |
| MMLU Pro (Artificial Analysis run) | 68.3% | Not measured | Only Mistral Medium 3.1 measured |
| LMArena Text: science | 1444 | 1430 | Mistral Medium 3.1 |
| LMArena Text: medicine and healthcare | 1449 | 1376 | Mistral Medium 3.1 |
| LMArena Text: legal and government | 1439 | 1433 | Mistral Medium 3.1 |
| LMArena Text: business and finance | 1418 | 1430 | Beam 1.0 501B A23B |
| Neither model has a result on the other 7 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index02
| Benchmark | Mistral Medium 3.1 | Beam 1.0 501B A23B | Leader |
|---|---|---|---|
| Design Arena: websites | 1132 | 1250 | Beam 1.0 501B A23B |
| Design Arena: UI components | 1097 | Not measured | Only Mistral Medium 3.1 measured |
| Design Arena: game dev | 1073 | 1224 | Beam 1.0 501B A23B |
| Design Arena: data viz | 1144 | Not measured | Only Mistral Medium 3.1 measured |
| Design Arena: 3D | 1081 | Not measured | Only Mistral Medium 3.1 measured |
| Design Arena: all code categories | 1120 | Not measured | Only Mistral Medium 3.1 measured |
| Design Arena: SVG | 992 | Not measured | Only Mistral Medium 3.1 measured |
| Design Arena: ASCII art | 997 | Not measured | Only Mistral Medium 3.1 measured |
| Neither model has a result on the other 1 board here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index48
| Benchmark | Mistral Medium 3.1 | Beam 1.0 501B A23B | Leader |
|---|---|---|---|
| IFBench | 39.8% | Not measured | Only Mistral Medium 3.1 measured |
| Long context reasoning (AA-LCR) | 42.7% | Not measured | Only Mistral Medium 3.1 measured |
| DTBench | 67.5% | Not measured | Only Mistral Medium 3.1 measured |
| LMCA | 19.1% | Not measured | Only Mistral Medium 3.1 measured |
| LMArena Text | 1424 | 1425 | Beam 1.0 501B A23B |
| LMArena Text: instruction following | 1398 | 1430 | Beam 1.0 501B A23B |
| LMArena Text: creative writing | 1391 | 1390 | Mistral Medium 3.1 |
| LMArena Vision | 1172 | Not measured | Only Mistral Medium 3.1 measured |
| LMArena Text: English | 1438 | 1436 | Mistral Medium 3.1 |
| LMArena Text: non-English | 1408 | 1413 | Beam 1.0 501B A23B |
| LMArena Text: Chinese | 1447 | 1424 | Mistral Medium 3.1 |
| LMArena Text: German | 1432 | Not measured | Only Mistral Medium 3.1 measured |
| LMArena Text: Japanese | 1379 | Not measured | Only Mistral Medium 3.1 measured |
| LMArena Text: Korean | 1380 | Not measured | Only Mistral Medium 3.1 measured |
| LMArena Text: French | 1460 | 1461 | Beam 1.0 501B A23B |
| LMArena Text: Spanish | 1433 | Not measured | Only Mistral Medium 3.1 measured |
| LMArena Text: Russian | 1411 | 1412 | Beam 1.0 501B A23B |
| LMArena Text: Polish | 1430 | Not measured | Only Mistral Medium 3.1 measured |
| LMArena Text: multi-turn | 1418 | 1414 | Mistral Medium 3.1 |
| LMArena Text: longer queries | 1406 | 1429 | Beam 1.0 501B A23B |
| LMArena Text: writing and language | 1395 | 1400 | Beam 1.0 501B A23B |
| LMArena Text: entertainment and media | 1390 | 1399 | Beam 1.0 501B A23B |
| LMArena Vision: English | 1179 | Not measured | Only Mistral Medium 3.1 measured |
| LMArena Vision: Chinese | 1190 | Not measured | Only Mistral Medium 3.1 measured |
| LMArena Vision: reading text | 1175 | Not measured | Only Mistral Medium 3.1 measured |
| LMArena Vision: humor | 1168 | Not measured | Only Mistral Medium 3.1 measured |
| LMArena Vision: captioning | 1145 | Not measured | Only Mistral Medium 3.1 measured |
| LMArena Vision: recognizing things | 1147 | Not measured | Only Mistral Medium 3.1 measured |
| LMArena Vision: creative writing | 1200 | Not measured | Only Mistral Medium 3.1 measured |
| Neither model has a result on the other 17 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Mistral Medium 3.1 | Beam 1.0 501B A23B | 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
Beam 1.0 501B A23B costs less
Repository review
50K input + 3K output tokens
Beam 1.0 501B A23B costs less
Agent loop
200K input + 10K output tokens
Beam 1.0 501B A23B 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 Medium 3.1 | Reflection Beam 1.0 501B A23B |
|---|---|---|
| Maker | Mistral AI | Reflection |
| Weights | No public weights listed | Open weights |
| Released | August 13, 2025 | October 16, 2026 |
| Context window | 131K | 1.05M |
| Input $/Mtok | $0.40 | $0.35 |
| Output $/Mtok | $2.00 | $1.10 |
| 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 Medium 3.1 better than Beam 1.0 501B A23B for coding?
Neither model has a coding score yet, so the two cannot be ranked on coding. Pick Mistral Medium 3.1 for work measured by LMArena Text: coding or LMArena Text: software and IT, where it leads.
Which is cheaper, Mistral Medium 3.1 or Beam 1.0 501B A23B?
Mistral Medium 3.1 costs $0.40 per million input tokens and $2.00 per million output tokens; Beam 1.0 501B A23B costs $0.35 and $1.10. Cost per solved task is known for neither of them.
Which has the bigger context window, Mistral Medium 3.1 or Beam 1.0 501B A23B?
Beam 1.0 501B A23B, with 1.05M tokens against 131K.
How many benchmarks is the Mistral Medium 3.1 vs Beam 1.0 501B A23B comparison based on?
25 benchmarks have a result for both models as of October 22, 2026. Mistral Medium 3.1's coding index rests on 0 independent benchmarks and Beam 1.0 501B A23B's on 1. Where only one model has a result, the page says so instead of naming a winner.