Gemini 3.1 Flash Lite Preview vs Mistral Medium 3.5
Mistral Medium 3.5 leads Gemini 3.1 Flash Lite Preview on coding, 25.5 to 22.7 on the Vibe Coding Index, and Gemini 3.1 Flash Lite Preview costs 5.0x less per output token ($1.50 vs $7.50 per million). Updated October 22, 2026; 68 benchmarks have a result for both.
Gemini 3.1 Flash Lite Preview or Mistral Medium 3.5: which to pick
Pick Mistral Medium 3.5 for coding: it scores 25.5 on the Vibe Coding Index against 22.7 for Gemini 3.1 Flash Lite Preview.
Pick Gemini 3.1 Flash Lite Preview for output tokens 5.0x cheaper ($1.50 vs $7.50 per million) and a lower cost per solved task ($0.18 against $6.02).
- Shared results
- 68
- Gemini 3.1 Flash Lite Preview only
- 11
- Mistral Medium 3.5 only
- 13
- Like-for-like categories
- 8 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
Mistral Medium 3.5
Mistral Medium 3.5 scores 25.5 against 22.7.
3 benchmarks behind each score
Intelligence
AA Intelligence Index
Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite Preview leads, 15.6 against 14.2.
Same board, both measured
Agentic work
AA Agentic Index
Mistral Medium 3.5
Mistral Medium 3.5 leads, 7.0 against 1.6.
Same board, both measured
Reasoning
GPQA Diamond
Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite Preview leads, 81.1% against 34.9%.
Same board, both measured
Math
AIME
No call
Only Gemini 3.1 Flash Lite Preview has a AIME result, 83.3%.
Directional only
Knowledge
MMLU Pro
Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite Preview leads, 86.2% against 75.3%.
Same board, both measured
Web design
Design Arena: websites
Mistral Medium 3.5
Mistral Medium 3.5 leads, 1142 against 1082.
Same board, both measured
Long documents
Listed context window
Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite Preview takes 1.05M tokens against 262K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite Preview $0.0010, Mistral Medium 3.5 $0.0053 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite Preview $0.18, Mistral Medium 3.5 $6.02.
Published attempt cost and pass rate
At a glance
- Coding index
- Gemini 3.1 Flash Lite Preview 22.7 from 3 benchmarks, Mistral Medium 3.5 25.5 from 3 benchmarks.
- Widest category
- Reasoning, 12.1 points apart on average over 6 shared benchmarks.
- Widest single gap
- GPQA Diamond: Gemini 3.1 Flash Lite Preview 81.1% against Mistral Medium 3.5 34.9%, 46.2 points apart on a 0 to 100 scale.
- Output price
- Gemini 3.1 Flash Lite Preview $1.50 against Mistral Medium 3.5 $7.50 per million output tokens, 5.0x apart.
- Context window
- Gemini 3.1 Flash Lite Preview takes 1.05M tokens, Mistral Medium 3.5 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 | Gemini 3.1 Flash Lite Preview | Bars | Mistral Medium 3.5 | Ties |
|---|---|---|---|---|
| Coding | 1 | 10 | ||
| Intelligence | 1 | 0 | ||
| Agentic work | 0 | 5 | ||
| Reasoning | 2 | 4 | ||
| Math | 0 | 2 | ||
| Knowledge | 7 | 3 | ||
| Web design | 2 | 6 | ||
| General | 16 | 9 | ||
| All shared boards | 29 | 39 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index110
| Benchmark | Gemini 3.1 Flash Lite Preview | Mistral Medium 3.5 | Leader |
|---|---|---|---|
| LMArena WebDev | 1257 | 1264 | Mistral Medium 3.5 |
| AA Coding Index | 34.7 | 46.9 | Mistral Medium 3.5 |
| LiveCodeBench (Vals AI) | 80.1% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| SWE-bench Verified (Vals AI) | 62.8% | 66.4% | Mistral Medium 3.5 |
| Vibe Code Bench (Vals AI) | 0.0% | 2.9% | Mistral Medium 3.5 |
| Code migration (Vals AI) | 4.6% | 5.1% | Mistral Medium 3.5 |
| ProgramBench (Vals AI) | 0.0% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| Terminal-Bench 2.1 (Vals AI) | 34.1% | 39.0% | Mistral Medium 3.5 |
| SciCode | Not measured | 40.2% | Only Mistral Medium 3.5 measured |
| Terminal-Bench Hard (Artificial Analysis run) | Not measured | 33.3% | Only Mistral Medium 3.5 measured |
| ALE-Bench | 797.7 | 764.0 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: coding | 1400 | 1460 | Mistral Medium 3.5 |
| LMArena Text: software and IT | 1413 | 1458 | Mistral Medium 3.5 |
| LMArena WebDev: React | 1245 | 1254 | Mistral Medium 3.5 |
| LMArena WebDev: HTML | 1276 | 1308 | Mistral Medium 3.5 |
| LMArena WebDev: from an image | 1336 | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| SciCode | 4.6% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| Neither model has a result on the other 22 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Gemini 3.1 Flash Lite Preview | Mistral Medium 3.5 | Leader |
|---|---|---|---|
| AA Intelligence Index | 15.6 | 14.2 | Gemini 3.1 Flash Lite Preview |
| Epoch Capabilities Index | Not measured | 141.4 | Only Mistral Medium 3.5 measured |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index05
| Benchmark | Gemini 3.1 Flash Lite Preview | Mistral Medium 3.5 | Leader |
|---|---|---|---|
| AA Agentic Index | 1.6 | 7.0 | Mistral Medium 3.5 |
| Finance Agent (Vals AI) | 30.0% | 32.1% | Mistral Medium 3.5 |
| Tax Agent Bench (Vals AI) | 3.1% | 4.5% | Mistral Medium 3.5 |
| Legal Research Bench (Vals AI) | 3.4% | 9.1% | Mistral Medium 3.5 |
| Excel Modeling Benchmark (Vals AI) | 8.6% | 11.2% | Mistral Medium 3.5 |
| τ²-Bench Telecom | Not measured | 94.2% | Only Mistral Medium 3.5 measured |
| Neither model has a result on the other 35 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index24
| Benchmark | Gemini 3.1 Flash Lite Preview | Mistral Medium 3.5 | Leader |
|---|---|---|---|
| GPQA Diamond | 81.1% | 34.9% | Gemini 3.1 Flash Lite Preview |
| MMMU Pro (Vals AI) | 82.5% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| GPQA Diamond (Artificial Analysis run) | Not measured | 74.8% | Only Mistral Medium 3.5 measured |
| Humanity's Last Exam (Artificial Analysis run) | Not measured | 13.8% | Only Mistral Medium 3.5 measured |
| LMArena Text: hard prompts | 1407 | 1436 | Mistral Medium 3.5 |
| LMArena Text: expert | 1398 | 1432 | Mistral Medium 3.5 |
| LMArena Text: hard prompts in English | 1403 | 1445 | Mistral Medium 3.5 |
| LMArena Vision: diagrams | 1242 | 1254 | Mistral Medium 3.5 |
| LMArena Vision: homework | 1271 | 1230 | Gemini 3.1 Flash Lite Preview |
| Kagi LLM Benchmark | Not measured | 41.4% | Only Mistral Medium 3.5 measured |
| Neither model has a result on the other 12 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index02
| Benchmark | Gemini 3.1 Flash Lite Preview | Mistral Medium 3.5 | Leader |
|---|---|---|---|
| AIME | 83.3% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| ProofBench | Not measured | 9.0% | Only Mistral Medium 3.5 measured |
| LMArena Text: math | 1428 | 1431 | Mistral Medium 3.5 |
| LMArena Text: mathematical work | 1417 | 1440 | Mistral Medium 3.5 |
| Neither model has a result on the other 9 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index73
| Benchmark | Gemini 3.1 Flash Lite Preview | Mistral Medium 3.5 | Leader |
|---|---|---|---|
| MMLU Pro | 86.2% | 75.3% | Gemini 3.1 Flash Lite Preview |
| LegalBench (Vals AI) | 83.8% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| CaseLaw (Vals AI) | 55.0% | 44.2% | Gemini 3.1 Flash Lite Preview |
| CorpFin (Vals AI) | 59.4% | 58.8% | Gemini 3.1 Flash Lite Preview |
| TaxEval (Vals AI) | 71.8% | 68.0% | Gemini 3.1 Flash Lite Preview |
| MortgageTax (Vals AI) | 68.0% | 28.9% | Gemini 3.1 Flash Lite Preview |
| MedCode (Vals AI) | 47.6% | 33.8% | Gemini 3.1 Flash Lite Preview |
| LMArena Text: science | 1425 | 1428 | Mistral Medium 3.5 |
| LMArena Text: medicine and healthcare | 1428 | 1409 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: legal and government | 1418 | 1437 | Mistral Medium 3.5 |
| LMArena Text: business and finance | 1389 | 1426 | Mistral Medium 3.5 |
| FACTS Benchmark Suite | 51.4% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| Neither model has a result on the other 6 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index26
| Benchmark | Gemini 3.1 Flash Lite Preview | Mistral Medium 3.5 | Leader |
|---|---|---|---|
| Design Arena: websites | 1082 | 1142 | Mistral Medium 3.5 |
| Design Arena: UI components | 1069 | 1076 | Mistral Medium 3.5 |
| Design Arena: game dev | 1029 | 1079 | Mistral Medium 3.5 |
| Design Arena: data viz | 1045 | 1120 | Mistral Medium 3.5 |
| Design Arena: 3D | 1047 | 1060 | Mistral Medium 3.5 |
| Design Arena: all code categories | 1072 | 1121 | Mistral Medium 3.5 |
| Design Arena: SVG | 1052 | 949 | Gemini 3.1 Flash Lite Preview |
| Design Arena: ASCII art | 1167 | 1062 | Gemini 3.1 Flash Lite Preview |
| Neither model has a result on the other 1 board here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index169
| Benchmark | Gemini 3.1 Flash Lite Preview | Mistral Medium 3.5 | Leader |
|---|---|---|---|
| SAGE (Vals AI) | 49.5% | 37.6% | Gemini 3.1 Flash Lite Preview |
| MedScribe (Vals AI) | 63.9% | 67.7% | Mistral Medium 3.5 |
| Vals Multimodal Index | 41.4% | 34.8% | Gemini 3.1 Flash Lite Preview |
| IFBench | Not measured | 68.8% | Only Mistral Medium 3.5 measured |
| Long context reasoning (AA-LCR) | Not measured | 69.3% | Only Mistral Medium 3.5 measured |
| DTBench | Not measured | 75.5% | Only Mistral Medium 3.5 measured |
| LMCA | Not measured | 26.1% | Only Mistral Medium 3.5 measured |
| Surface Evolver Bench | Not measured | 26.9% | Only Mistral Medium 3.5 measured |
| LMArena Text | 1416 | 1421 | Mistral Medium 3.5 |
| LMArena Text: instruction following | 1377 | 1415 | Mistral Medium 3.5 |
| LMArena Text: creative writing | 1401 | 1374 | Gemini 3.1 Flash Lite Preview |
| LMArena Vision | 1240 | 1222 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: English | 1414 | 1433 | Mistral Medium 3.5 |
| LMArena Text: non-English | 1410 | 1404 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: Chinese | 1460 | 1444 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: German | 1430 | 1453 | Mistral Medium 3.5 |
| LMArena Text: Japanese | 1413 | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena Text: Korean | 1392 | 1384 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: French | 1424 | 1448 | Mistral Medium 3.5 |
| LMArena Text: Spanish | 1421 | 1411 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: Russian | 1420 | 1395 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: Polish | 1443 | 1430 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: multi-turn | 1417 | 1423 | Mistral Medium 3.5 |
| LMArena Text: longer queries | 1394 | 1415 | Mistral Medium 3.5 |
| LMArena Text: writing and language | 1408 | 1384 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: entertainment and media | 1386 | 1382 | Gemini 3.1 Flash Lite Preview |
| LMArena Vision: English | 1232 | 1240 | Mistral Medium 3.5 |
| LMArena Vision: Chinese | 1278 | 1244 | Gemini 3.1 Flash Lite Preview |
| LMArena Vision: reading text | 1246 | 1233 | Gemini 3.1 Flash Lite Preview |
| LMArena Vision: humor | 1266 | 1216 | Gemini 3.1 Flash Lite Preview |
| LMArena Vision: captioning | 1259 | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena Vision: recognizing things | 1308 | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena Vision: creative writing | 1248 | 1198 | Gemini 3.1 Flash Lite Preview |
| Neither model has a result on the other 13 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Gemini 3.1 Flash Lite Preview | Mistral Medium 3.5 | 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
Gemini 3.1 Flash Lite Preview costs less
Repository review
50K input + 3K output tokens
Gemini 3.1 Flash Lite Preview costs less
Agent loop
200K input + 10K output tokens
Gemini 3.1 Flash Lite Preview 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 | Google Gemini 3.1 Flash Lite Preview | Mistral Medium 3.5 |
|---|---|---|
| Maker | Mistral AI | |
| Weights | No public weights listed | No public weights listed |
| Released | March 3, 2026 | April 30, 2026 |
| Context window | 1.05M | 262K |
| Input $/Mtok | $0.25 | $1.50 |
| Output $/Mtok | $1.50 | $7.50 |
| Coding index | 22.7 | 25.5 |
| Independent measurements behind it | 3 | 3 |
| Cost per solved task | $0.18 | $6.02 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Gemini 3.1 Flash Lite Preview better than Mistral Medium 3.5 for coding?
Pick Mistral Medium 3.5 for coding: it scores 25.5 on the Vibe Coding Index against 22.7 for Gemini 3.1 Flash Lite Preview. Pick Gemini 3.1 Flash Lite Preview for output tokens 5.0x cheaper ($1.50 vs $7.50 per million) and a lower cost per solved task ($0.18 against $6.02).
Which is cheaper, Gemini 3.1 Flash Lite Preview or Mistral Medium 3.5?
Gemini 3.1 Flash Lite Preview costs $0.25 per million input tokens and $1.50 per million output tokens; Mistral Medium 3.5 costs $1.50 and $7.50. Per solved SWE-bench Verified task, Gemini 3.1 Flash Lite Preview costs $0.18 and Mistral Medium 3.5 $6.02.
Which has the bigger context window, Gemini 3.1 Flash Lite Preview or Mistral Medium 3.5?
Gemini 3.1 Flash Lite Preview, with 1.05M tokens against 262K.
How many benchmarks is the Gemini 3.1 Flash Lite Preview vs Mistral Medium 3.5 comparison based on?
68 benchmarks have a result for both models as of October 22, 2026. Gemini 3.1 Flash Lite Preview's coding index rests on 3 independent benchmarks and Mistral Medium 3.5's on 3. Where only one model has a result, the page says so instead of naming a winner.