Gemini 3.1 Flash Lite Preview vs Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview leads Gemini 3.1 Flash Lite Preview on coding, 32.3 to 22.7 on the Vibe Coding Index, and Gemini 3.1 Flash Lite Preview costs 8.0x less per output token ($1.50 vs $12.00 per million). Updated October 22, 2026; 79 benchmarks have a result for both.
Gemini 3.1 Flash Lite Preview or Gemini 3.1 Pro Preview: which to pick
Pick Gemini 3.1 Pro Preview for coding: it scores 32.3 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 8.0x cheaper ($1.50 vs $12.00 per million) and a lower cost per solved task ($0.18 against $0.99).
- Shared results
- 79
- Gemini 3.1 Flash Lite Preview only
- 0
- Gemini 3.1 Pro Preview only
- 54
- 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
Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview scores 32.3 against 22.7.
3 and 4 benchmarks behind the scores
Intelligence
AA Intelligence Index
Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview leads, 29.7 against 15.6.
Same board, both measured
Agentic work
AA Agentic Index
Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview leads, 8.2 against 1.6.
Same board, both measured
Reasoning
GPQA Diamond
Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview leads, 95.5% against 81.1%.
Same board, both measured
Math
AIME
Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview leads, 98.1% against 83.3%.
Same board, both measured
Knowledge
MMLU Pro
Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview leads, 91.0% against 86.2%.
Same board, both measured
Web design
Design Arena: websites
Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview leads, 1233 against 1082.
Same board, both measured
Long documents
Listed context window
No call
Both take 1.05M tokens.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite Preview $0.0010, Gemini 3.1 Pro Preview $0.0080 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, Gemini 3.1 Pro Preview $0.99.
Published attempt cost and pass rate
At a glance
- Coding index
- Gemini 3.1 Flash Lite Preview 22.7 from 3 benchmarks, Gemini 3.1 Pro Preview 32.3 from 4 benchmarks.
- Widest category
- Web design, 20.7 points apart on average over 8 shared benchmarks.
- Widest single gap
- Excel Modeling Benchmark (Vals AI): Gemini 3.1 Flash Lite Preview 8.6% against Gemini 3.1 Pro Preview 52.6%, 44.0 points apart on a 0 to 100 scale.
- Output price
- Gemini 3.1 Flash Lite Preview $1.50 against Gemini 3.1 Pro Preview $12.00 per million output tokens, 8.0x apart.
- Context window
- Both take 1.05M tokens.
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 | Gemini 3.1 Pro Preview | Ties |
|---|---|---|---|---|
| Coding | 0 | 14 | 1 tie | |
| Intelligence | 0 | 1 | ||
| Agentic work | 0 | 5 | ||
| Reasoning | 0 | 7 | ||
| Math | 0 | 3 | ||
| Knowledge | 0 | 12 | ||
| Web design | 0 | 8 | ||
| General | 1 | 27 | ||
| All shared boards | 1 | 77 | 1 tie |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index014
| Benchmark | Gemini 3.1 Flash Lite Preview | Gemini 3.1 Pro Preview | Leader |
|---|---|---|---|
| LMArena WebDev | 1257 | 1447 | Gemini 3.1 Pro Preview |
| AA Coding Index | 34.7 | 68.8 | Gemini 3.1 Pro Preview |
| LiveCodeBench (Vals AI) | 80.1% | 88.5% | Gemini 3.1 Pro Preview |
| SWE-bench Verified (Vals AI) | 62.8% | 78.8% | Gemini 3.1 Pro Preview |
| Terminal-Bench 4 (Vals AI) | Not measured | 2.5% | Only Gemini 3.1 Pro Preview measured |
| Vibe Code Bench (Vals AI) | 0.0% | 32.0% | Gemini 3.1 Pro Preview |
| Code migration (Vals AI) | 4.6% | 17.3% | Gemini 3.1 Pro Preview |
| ProgramBench (Vals AI) | 0.0% | 0.0% | Tie |
| IOI (Vals AI) | Not measured | 51.8% | Only Gemini 3.1 Pro Preview measured |
| Terminal-Bench 2.1 (Vals AI) | 34.1% | 70.8% | Gemini 3.1 Pro Preview |
| Vibe Code Bench 1-100 (Vals AI) | Not measured | 6.7% | Only Gemini 3.1 Pro Preview measured |
| SciCode | Not measured | 58.7% | Only Gemini 3.1 Pro Preview measured |
| Terminal-Bench Hard (Artificial Analysis run) | Not measured | 53.8% | Only Gemini 3.1 Pro Preview measured |
| Terminal-Bench | Not measured | 80.2% | Only Gemini 3.1 Pro Preview measured |
| GSO-Bench | Not measured | 22.6% | Only Gemini 3.1 Pro Preview measured |
| WeirdML | Not measured | 72.1% | Only Gemini 3.1 Pro Preview measured |
| MirrorCode | Not measured | 8.9% | Only Gemini 3.1 Pro Preview measured |
| ALE-Bench | 797.7 | 1160.6 | Gemini 3.1 Pro Preview |
| LMArena Text: coding | 1400 | 1484 | Gemini 3.1 Pro Preview |
| LMArena Text: software and IT | 1413 | 1487 | Gemini 3.1 Pro Preview |
| LMArena WebDev: React | 1245 | 1438 | Gemini 3.1 Pro Preview |
| LMArena WebDev: HTML | 1276 | 1490 | Gemini 3.1 Pro Preview |
| LMArena WebDev: from an image | 1336 | 1481 | Gemini 3.1 Pro Preview |
| SciCode | 4.6% | 14.3% | Gemini 3.1 Pro Preview |
| Neither model has a result on the other 15 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | Gemini 3.1 Flash Lite Preview | Gemini 3.1 Pro Preview | Leader |
|---|---|---|---|
| AA Intelligence Index | 15.6 | 29.7 | Gemini 3.1 Pro Preview |
| Neither model has a result on the other 1 board here | |||
Agentic workLike-for-likePublic boards, shown as published, kept out of the index05
| Benchmark | Gemini 3.1 Flash Lite Preview | Gemini 3.1 Pro Preview | Leader |
|---|---|---|---|
| AA Agentic Index | 1.6 | 8.2 | Gemini 3.1 Pro Preview |
| Design Arena: agents building web apps | Not measured | 1125 | Only Gemini 3.1 Pro Preview measured |
| Design Arena: agents building full-stack apps | Not measured | 1068 | Only Gemini 3.1 Pro Preview measured |
| Design Arena: agents building mobile apps | Not measured | 1094 | Only Gemini 3.1 Pro Preview measured |
| Design Arena: agents building Android apps | Not measured | 1049 | Only Gemini 3.1 Pro Preview measured |
| Design Arena: agents building Godot games | Not measured | 1236 | Only Gemini 3.1 Pro Preview measured |
| Design Arena: agents building games | Not measured | 1113 | Only Gemini 3.1 Pro Preview measured |
| Design Arena: HTML slides | Not measured | 1103 | Only Gemini 3.1 Pro Preview measured |
| Design Arena: PowerPoint slides | Not measured | 1041 | Only Gemini 3.1 Pro Preview measured |
| SREBench (Vals AI) | Not measured | 0.0% | Only Gemini 3.1 Pro Preview measured |
| Finance Agent (Vals AI) | 30.0% | 43.0% | Gemini 3.1 Pro Preview |
| Tax Agent Bench (Vals AI) | 3.1% | 9.3% | Gemini 3.1 Pro Preview |
| Legal Research Bench (Vals AI) | 3.4% | 20.7% | Gemini 3.1 Pro Preview |
| Excel Modeling Benchmark (Vals AI) | 8.6% | 52.6% | Gemini 3.1 Pro Preview |
| BioMysteryBench (Vals AI) | Not measured | 60.0% | Only Gemini 3.1 Pro Preview measured |
| Terminal-Bench-Science (Vals AI) | Not measured | 1.4% | Only Gemini 3.1 Pro Preview measured |
| Vals Science Index | Not measured | 27.4% | Only Gemini 3.1 Pro Preview measured |
| τ²-Bench Telecom | Not measured | 95.6% | Only Gemini 3.1 Pro Preview measured |
| APEX-Agents | Not measured | 35.1% | Only Gemini 3.1 Pro Preview measured |
| METR time horizons | Not measured | 77.0% | Only Gemini 3.1 Pro Preview measured |
| BALROG | Not measured | 57.0% | Only Gemini 3.1 Pro Preview measured |
| DeepResearch Bench | Not measured | 47.8% | Only Gemini 3.1 Pro Preview measured |
| PostTrainBench | Not measured | 22.0% | Only Gemini 3.1 Pro Preview measured |
| Vending-Bench 2 | Not measured | $911 | Only Gemini 3.1 Pro Preview measured |
| Neither model has a result on the other 17 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index07
| Benchmark | Gemini 3.1 Flash Lite Preview | Gemini 3.1 Pro Preview | Leader |
|---|---|---|---|
| GPQA Diamond | 81.1% | 95.5% | Gemini 3.1 Pro Preview |
| MysteryMechanism (Vals AI) | Not measured | 20.7% | Only Gemini 3.1 Pro Preview measured |
| MMMU Pro (Vals AI) | 82.5% | 88.2% | Gemini 3.1 Pro Preview |
| GPQA Diamond (Artificial Analysis run) | Not measured | 94.1% | Only Gemini 3.1 Pro Preview measured |
| Humanity's Last Exam (Artificial Analysis run) | Not measured | 47.0% | Only Gemini 3.1 Pro Preview measured |
| GPQA Diamond (Epoch AI run) | Not measured | 94.4% | Only Gemini 3.1 Pro Preview measured |
| ARC-AGI | Not measured | 98.0% | Only Gemini 3.1 Pro Preview measured |
| ARC-AGI-2 | Not measured | 77.1% | Only Gemini 3.1 Pro Preview measured |
| SimpleBench | Not measured | 79.6% | Only Gemini 3.1 Pro Preview measured |
| Chess puzzles | Not measured | 51.0% | Only Gemini 3.1 Pro Preview measured |
| Mystery game puzzles | Not measured | 34.0% | Only Gemini 3.1 Pro Preview measured |
| EBR-bench | Not measured | 14.3% | Only Gemini 3.1 Pro Preview measured |
| LMArena Text: hard prompts | 1407 | 1485 | Gemini 3.1 Pro Preview |
| LMArena Text: expert | 1398 | 1483 | Gemini 3.1 Pro Preview |
| LMArena Text: hard prompts in English | 1403 | 1480 | Gemini 3.1 Pro Preview |
| LMArena Vision: diagrams | 1242 | 1311 | Gemini 3.1 Pro Preview |
| LMArena Vision: homework | 1271 | 1316 | Gemini 3.1 Pro Preview |
| Neither model has a result on the other 5 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index03
| Benchmark | Gemini 3.1 Flash Lite Preview | Gemini 3.1 Pro Preview | Leader |
|---|---|---|---|
| AIME | 83.3% | 98.1% | Gemini 3.1 Pro Preview |
| OTIS Mock AIME | Not measured | 95.6% | Only Gemini 3.1 Pro Preview measured |
| FrontierMath, tiers 1 to 3 | Not measured | 59.6% | Only Gemini 3.1 Pro Preview measured |
| FrontierMath, tier 4 | Not measured | 26.8% | Only Gemini 3.1 Pro Preview measured |
| ProofBench | Not measured | 26.0% | Only Gemini 3.1 Pro Preview measured |
| LMArena Text: math | 1428 | 1486 | Gemini 3.1 Pro Preview |
| LMArena Text: mathematical work | 1417 | 1478 | Gemini 3.1 Pro Preview |
| Neither model has a result on the other 6 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index012
| Benchmark | Gemini 3.1 Flash Lite Preview | Gemini 3.1 Pro Preview | Leader |
|---|---|---|---|
| MMLU Pro | 86.2% | 91.0% | Gemini 3.1 Pro Preview |
| LegalBench (Vals AI) | 83.8% | 87.4% | Gemini 3.1 Pro Preview |
| CaseLaw (Vals AI) | 55.0% | 64.8% | Gemini 3.1 Pro Preview |
| CorpFin (Vals AI) | 59.4% | 64.5% | Gemini 3.1 Pro Preview |
| TaxEval (Vals AI) | 71.8% | 72.9% | Gemini 3.1 Pro Preview |
| MortgageTax (Vals AI) | 68.0% | 69.4% | Gemini 3.1 Pro Preview |
| MedQA (Vals AI) | Not measured | 96.4% | Only Gemini 3.1 Pro Preview measured |
| MedCode (Vals AI) | 47.6% | 59.1% | Gemini 3.1 Pro Preview |
| SimpleQA Verified | Not measured | 73.5% | Only Gemini 3.1 Pro Preview measured |
| LMArena Text: science | 1425 | 1497 | Gemini 3.1 Pro Preview |
| LMArena Text: medicine and healthcare | 1428 | 1486 | Gemini 3.1 Pro Preview |
| LMArena Text: legal and government | 1418 | 1487 | Gemini 3.1 Pro Preview |
| LMArena Text: business and finance | 1389 | 1459 | Gemini 3.1 Pro Preview |
| FACTS Benchmark Suite | 51.4% | 67.4% | Gemini 3.1 Pro Preview |
| Neither model has a result on the other 4 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index08
| Benchmark | Gemini 3.1 Flash Lite Preview | Gemini 3.1 Pro Preview | Leader |
|---|---|---|---|
| Design Arena: websites | 1082 | 1233 | Gemini 3.1 Pro Preview |
| Design Arena: UI components | 1069 | 1224 | Gemini 3.1 Pro Preview |
| Design Arena: game dev | 1029 | 1202 | Gemini 3.1 Pro Preview |
| Design Arena: data viz | 1045 | 1209 | Gemini 3.1 Pro Preview |
| Design Arena: 3D | 1047 | 1234 | Gemini 3.1 Pro Preview |
| Design Arena: all code categories | 1072 | 1231 | Gemini 3.1 Pro Preview |
| Design Arena: SVG | 1052 | 1285 | Gemini 3.1 Pro Preview |
| Design Arena: ASCII art | 1167 | 1270 | Gemini 3.1 Pro Preview |
| Neither model has a result on the other 1 board here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index127
| Benchmark | Gemini 3.1 Flash Lite Preview | Gemini 3.1 Pro Preview | Leader |
|---|---|---|---|
| Public Benefits Bench (Vals AI) | Not measured | 53.8% | Only Gemini 3.1 Pro Preview measured |
| SAGE (Vals AI) | 49.5% | 48.7% | Gemini 3.1 Flash Lite Preview |
| MedScribe (Vals AI) | 63.9% | 76.1% | Gemini 3.1 Pro Preview |
| Vals Multimodal Index | 41.4% | 56.1% | Gemini 3.1 Pro Preview |
| IFBench | Not measured | 77.1% | Only Gemini 3.1 Pro Preview measured |
| Long context reasoning (AA-LCR) | Not measured | 82.0% | Only Gemini 3.1 Pro Preview measured |
| DTBench | Not measured | 97.1% | Only Gemini 3.1 Pro Preview measured |
| LMCA | Not measured | 53.8% | Only Gemini 3.1 Pro Preview measured |
| CL-bench | Not measured | 20.8% | Only Gemini 3.1 Pro Preview measured |
| Furniture assembly | Not measured | 26.7% | Only Gemini 3.1 Pro Preview measured |
| ExploitBench | Not measured | 26.1% | Only Gemini 3.1 Pro Preview measured |
| CL-bench Life | Not measured | 16.9% | Only Gemini 3.1 Pro Preview measured |
| LMArena Text | 1416 | 1480 | Gemini 3.1 Pro Preview |
| LMArena Text: instruction following | 1377 | 1466 | Gemini 3.1 Pro Preview |
| LMArena Text: creative writing | 1401 | 1482 | Gemini 3.1 Pro Preview |
| LMArena Vision | 1240 | 1296 | Gemini 3.1 Pro Preview |
| LMArena Text: English | 1414 | 1478 | Gemini 3.1 Pro Preview |
| LMArena Text: non-English | 1410 | 1476 | Gemini 3.1 Pro Preview |
| LMArena Text: Chinese | 1460 | 1527 | Gemini 3.1 Pro Preview |
| LMArena Text: German | 1430 | 1490 | Gemini 3.1 Pro Preview |
| LMArena Text: Japanese | 1413 | 1491 | Gemini 3.1 Pro Preview |
| LMArena Text: Korean | 1392 | 1455 | Gemini 3.1 Pro Preview |
| LMArena Text: French | 1424 | 1487 | Gemini 3.1 Pro Preview |
| LMArena Text: Spanish | 1421 | 1481 | Gemini 3.1 Pro Preview |
| LMArena Text: Russian | 1420 | 1497 | Gemini 3.1 Pro Preview |
| LMArena Text: Polish | 1443 | 1498 | Gemini 3.1 Pro Preview |
| LMArena Text: multi-turn | 1417 | 1487 | Gemini 3.1 Pro Preview |
| LMArena Text: longer queries | 1394 | 1482 | Gemini 3.1 Pro Preview |
| LMArena Text: writing and language | 1408 | 1481 | Gemini 3.1 Pro Preview |
| LMArena Text: entertainment and media | 1386 | 1465 | Gemini 3.1 Pro Preview |
| LMArena Vision: English | 1232 | 1287 | Gemini 3.1 Pro Preview |
| LMArena Vision: Chinese | 1278 | 1364 | Gemini 3.1 Pro Preview |
| LMArena Vision: reading text | 1246 | 1304 | Gemini 3.1 Pro Preview |
| LMArena Vision: humor | 1266 | 1322 | Gemini 3.1 Pro Preview |
| LMArena Vision: captioning | 1259 | 1345 | Gemini 3.1 Pro Preview |
| LMArena Vision: recognizing things | 1308 | 1330 | Gemini 3.1 Pro Preview |
| LMArena Vision: creative writing | 1248 | 1324 | Gemini 3.1 Pro Preview |
| LMArena Document | Not measured | 1444 | Only Gemini 3.1 Pro Preview measured |
| Neither model has a result on the other 8 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Gemini 3.1 Flash Lite Preview | Gemini 3.1 Pro Preview | 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 | Google Gemini 3.1 Pro Preview |
|---|---|---|
| Maker | ||
| Weights | No public weights listed | No public weights listed |
| Released | March 3, 2026 | February 19, 2026 |
| Context window | 1.05M | 1.05M |
| Input $/Mtok | $0.25 | $2.00 |
| Output $/Mtok | $1.50 | $12.00 |
| Coding index | 22.7 | 32.3 |
| Independent measurements behind it | 3 | 4 |
| Cost per solved task | $0.18 | $0.99 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Gemini 3.1 Flash Lite Preview better than Gemini 3.1 Pro Preview for coding?
Pick Gemini 3.1 Pro Preview for coding: it scores 32.3 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 8.0x cheaper ($1.50 vs $12.00 per million) and a lower cost per solved task ($0.18 against $0.99).
Which is cheaper, Gemini 3.1 Flash Lite Preview or Gemini 3.1 Pro Preview?
Gemini 3.1 Flash Lite Preview costs $0.25 per million input tokens and $1.50 per million output tokens; Gemini 3.1 Pro Preview costs $2.00 and $12.00. Per solved SWE-bench Verified task, Gemini 3.1 Flash Lite Preview costs $0.18 and Gemini 3.1 Pro Preview $0.99.
Which has the bigger context window, Gemini 3.1 Flash Lite Preview or Gemini 3.1 Pro Preview?
Neither: both take 1.05M tokens.
How many benchmarks is the Gemini 3.1 Flash Lite Preview vs Gemini 3.1 Pro Preview comparison based on?
79 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 Gemini 3.1 Pro Preview's on 4. Where only one model has a result, the page says so instead of naming a winner.