Gemini 3.1 Pro Preview vs o4 Mini
Gemini 3.1 Pro Preview leads o4 Mini on the Artificial Analysis Intelligence Index, 29.7 to 16.7, and o4 Mini costs 2.7x less per output token ($4.40 vs $12.00 per million). Updated October 21, 2026; 81 benchmarks have a result for both.
vs boards won of 81 shared
Gemini 3.1 Pro Preview or o4 Mini: which to pick
Only Gemini 3.1 Pro Preview has a coding score, 32.3 on the Vibe Coding Index; o4 Mini has none, so the two cannot be ranked on coding.
Pick o4 Mini for output tokens 2.7x cheaper ($4.40 vs $12.00 per million) and work measured by TaxEval (Vals AI), where it leads.
Model AGemini 3.1 Pro PreviewGoogle32.3/1004 independent benchmarks$0.99 per solved taskModel Bo4 MiniOpenAINot benchmarkedNo coding benchmarkNo cost per solved task
- Shared results
- 81
- Gemini 3.1 Pro Preview only
- 52
- o4 Mini only
- 17
- 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
No call
Only Gemini 3.1 Pro Preview has a coding score, so no call is made.
One side not measured
Intelligence
AA Intelligence Index
Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview leads, 29.7 against 16.7.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Gemini 3.1 Pro Preview has a AA Agentic Index result, 8.2.
Directional only
Reasoning
GPQA Diamond
Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview leads, 95.5% against 74.5%.
Same board, both measured
Math
AIME
Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview leads, 98.1% against 83.7%.
Same board, both measured
Knowledge
MMLU Pro
Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview leads, 91.0% against 80.6%.
Same board, both measured
Web design
Design Arena: websites
Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview leads, 1234 against 985.
Same board, both measured
Long documents
Listed context window
Gemini 3.1 Pro Preview
Gemini 3.1 Pro Preview takes 1.05M tokens against 200K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
o4 Mini
Gemini 3.1 Pro Preview $0.0080, o4 Mini $0.0033 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Gemini 3.1 Pro Preview has the number, $0.99.
Directional only
At a glance
- Coding index
- Gemini 3.1 Pro Preview 32.3 from 4 benchmarks, o4 Mini not benchmarked.
- Widest category
- Web design, 32.2 points apart on average over 6 shared benchmarks.
- Widest single gap
- ARC-AGI-2: Gemini 3.1 Pro Preview 77.1% against o4 Mini 6.1%, 71.0 points apart on a 0 to 100 scale.
- Output price
- Gemini 3.1 Pro Preview $12.00 against o4 Mini $4.40 per million output tokens, 2.7x apart.
- Context window
- Gemini 3.1 Pro Preview takes 1.05M tokens, o4 Mini 200K.
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 Pro Preview | Bars | o4 Mini | Ties |
|---|---|---|---|---|
| Coding | 7 | 0 | ||
| Intelligence | 1 | 0 | ||
| Agentic work | 2 | 0 | ||
| Reasoning | 15 | 0 | ||
| Math | 6 | 0 | ||
| Knowledge | 12 | 1 | ||
| Web design | 6 | 0 | ||
| General | 31 | 0 | ||
| All shared boards | 80 | 1 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index70
| Benchmark | Gemini 3.1 Pro Preview | o4 Mini | Leader |
|---|---|---|---|
| Aider polyglot | Not measured | 72.0% | Only o4 Mini measured |
| SWE-bench Verified | Not measured | 64.6% | Only o4 Mini measured |
| SWE-bench Multimodal | Not measured | 33.9% | Only o4 Mini measured |
| LMArena WebDev | 1447 | Not measured | Only Gemini 3.1 Pro Preview measured |
| AA Coding Index | 68.8 | Not measured | Only Gemini 3.1 Pro Preview measured |
| LiveCodeBench (Vals AI) | 88.5% | 82.2% | Gemini 3.1 Pro Preview |
| SWE-bench Verified (Vals AI) | 78.8% | Not measured | Only Gemini 3.1 Pro Preview measured |
| Terminal-Bench 4 (Vals AI) | 2.5% | Not measured | Only Gemini 3.1 Pro Preview measured |
| Vibe Code Bench (Vals AI) | 32.0% | Not measured | Only Gemini 3.1 Pro Preview measured |
| Code migration (Vals AI) | 17.3% | Not measured | Only Gemini 3.1 Pro Preview measured |
| ProgramBench (Vals AI) | 0.0% | Not measured | Only Gemini 3.1 Pro Preview measured |
| IOI (Vals AI) | 51.8% | Not measured | Only Gemini 3.1 Pro Preview measured |
| Terminal-Bench 2.1 (Vals AI) | 70.8% | Not measured | Only Gemini 3.1 Pro Preview measured |
| Vibe Code Bench 1-100 (Vals AI) | 6.7% | Not measured | Only Gemini 3.1 Pro Preview measured |
| LiveCodeBench (Artificial Analysis run) | Not measured | 85.9% | Only o4 Mini measured |
| SciCode | 58.7% | Not measured | Only Gemini 3.1 Pro Preview measured |
| Terminal-Bench Hard (Artificial Analysis run) | 53.8% | 15.2% | Gemini 3.1 Pro Preview |
| Terminal-Bench | 80.2% | Not measured | Only Gemini 3.1 Pro Preview measured |
| GSO-Bench | 22.6% | 3.6% | Gemini 3.1 Pro Preview |
| WeirdML | 72.1% | 52.6% | Gemini 3.1 Pro Preview |
| MirrorCode | 8.9% | Not measured | Only Gemini 3.1 Pro Preview measured |
| ALE-Bench | 1160.6 | Not measured | Only Gemini 3.1 Pro Preview measured |
| LMArena Text: coding | 1484 | 1368 | Gemini 3.1 Pro Preview |
| LMArena Text: software and IT | 1487 | 1367 | Gemini 3.1 Pro Preview |
| LMArena WebDev: React | 1438 | Not measured | Only Gemini 3.1 Pro Preview measured |
| LMArena WebDev: HTML | 1490 | Not measured | Only Gemini 3.1 Pro Preview measured |
| LMArena WebDev: from an image | 1481 | Not measured | Only Gemini 3.1 Pro Preview measured |
| SciCode | 14.3% | 10.8% | Gemini 3.1 Pro Preview |
| Neither model has a result on the other 11 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Gemini 3.1 Pro Preview | o4 Mini | Leader |
|---|---|---|---|
| AA Intelligence Index | 29.7 | 16.7 | Gemini 3.1 Pro Preview |
| Epoch Capabilities Index | Not measured | 145.5 | Only o4 Mini measured |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Gemini 3.1 Pro Preview | o4 Mini | Leader |
|---|---|---|---|
| AA Agentic Index | 8.2 | Not measured | Only Gemini 3.1 Pro Preview measured |
| Design Arena: agents building web apps | 1125 | Not measured | Only Gemini 3.1 Pro Preview measured |
| Design Arena: agents building full-stack apps | 1068 | Not measured | Only Gemini 3.1 Pro Preview measured |
| Design Arena: agents building mobile apps | 1093 | Not measured | Only Gemini 3.1 Pro Preview measured |
| Design Arena: agents building Android apps | 1048 | Not measured | Only Gemini 3.1 Pro Preview measured |
| Design Arena: agents building Godot games | 1236 | Not measured | Only Gemini 3.1 Pro Preview measured |
| Design Arena: agents building games | 1114 | Not measured | Only Gemini 3.1 Pro Preview measured |
| Design Arena: HTML slides | 1153 | Not measured | Only Gemini 3.1 Pro Preview measured |
| Design Arena: PowerPoint slides | 1066 | Not measured | Only Gemini 3.1 Pro Preview measured |
| SREBench (Vals AI) | 0.0% | Not measured | Only Gemini 3.1 Pro Preview measured |
| Finance Agent (Vals AI) | 43.0% | Not measured | Only Gemini 3.1 Pro Preview measured |
| Tax Agent Bench (Vals AI) | 9.3% | Not measured | Only Gemini 3.1 Pro Preview measured |
| Legal Research Bench (Vals AI) | 20.7% | Not measured | Only Gemini 3.1 Pro Preview measured |
| Excel Modeling Benchmark (Vals AI) | 52.6% | Not measured | Only Gemini 3.1 Pro Preview measured |
| BioMysteryBench (Vals AI) | 60.0% | Not measured | Only Gemini 3.1 Pro Preview measured |
| Terminal-Bench-Science (Vals AI) | 1.4% | Not measured | Only Gemini 3.1 Pro Preview measured |
| Vals Science Index | 27.4% | Not measured | Only Gemini 3.1 Pro Preview measured |
| τ²-Bench Telecom | 95.6% | 55.6% | Gemini 3.1 Pro Preview |
| APEX-Agents | 35.1% | Not measured | Only Gemini 3.1 Pro Preview measured |
| METR time horizons | 77.0% | 63.9% | Gemini 3.1 Pro Preview |
| BALROG | 57.0% | Not measured | Only Gemini 3.1 Pro Preview measured |
| DeepResearch Bench | 47.8% | Not measured | Only Gemini 3.1 Pro Preview measured |
| PostTrainBench | 22.0% | Not measured | Only Gemini 3.1 Pro Preview measured |
| Vending-Bench 2 | $911 | Not measured | Only Gemini 3.1 Pro Preview measured |
| Berkeley Function Calling Leaderboard (BFCL) | Not measured | 53.2% | Only o4 Mini measured |
| Neither model has a result on the other 16 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index150
| Benchmark | Gemini 3.1 Pro Preview | o4 Mini | Leader |
|---|---|---|---|
| GPQA Diamond | 95.5% | 74.5% | Gemini 3.1 Pro Preview |
| MysteryMechanism (Vals AI) | 20.7% | Not measured | Only Gemini 3.1 Pro Preview measured |
| MMMU Pro (Vals AI) | 88.2% | 79.7% | Gemini 3.1 Pro Preview |
| GPQA Diamond (Artificial Analysis run) | 94.1% | 78.4% | Gemini 3.1 Pro Preview |
| Humanity's Last Exam (Artificial Analysis run) | 47.0% | 16.5% | Gemini 3.1 Pro Preview |
| GPQA Diamond (Epoch AI run) | 94.4% | 79.6% | Gemini 3.1 Pro Preview |
| ARC-AGI | 98.0% | 58.7% | Gemini 3.1 Pro Preview |
| ARC-AGI-2 | 77.1% | 6.1% | Gemini 3.1 Pro Preview |
| SimpleBench | 79.6% | 38.7% | Gemini 3.1 Pro Preview |
| Chess puzzles | 51.0% | 22.0% | Gemini 3.1 Pro Preview |
| Mystery game puzzles | 34.0% | 5.0% | Gemini 3.1 Pro Preview |
| EBR-bench | 14.3% | Not measured | Only Gemini 3.1 Pro Preview measured |
| VPCT | Not measured | 57.5% | Only o4 Mini measured |
| LMArena Text: hard prompts | 1485 | 1351 | Gemini 3.1 Pro Preview |
| LMArena Text: expert | 1483 | 1343 | Gemini 3.1 Pro Preview |
| LMArena Text: hard prompts in English | 1480 | 1366 | Gemini 3.1 Pro Preview |
| LMArena Vision: diagrams | 1311 | 1197 | Gemini 3.1 Pro Preview |
| LMArena Vision: homework | 1316 | 1234 | Gemini 3.1 Pro Preview |
| Kagi LLM Benchmark | Not measured | 67.6% | Only o4 Mini measured |
| Neither model has a result on the other 3 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index60
| Benchmark | Gemini 3.1 Pro Preview | o4 Mini | Leader |
|---|---|---|---|
| AIME | 98.1% | 83.7% | Gemini 3.1 Pro Preview |
| MATH 500 (Vals AI) | Not measured | 94.2% | Only o4 Mini measured |
| MGSM (Vals AI) | Not measured | 93.4% | Only o4 Mini measured |
| AA Math Index | Not measured | 90.7 | Only o4 Mini measured |
| AIME 2025 (Artificial Analysis run) | Not measured | 90.7% | Only o4 Mini measured |
| OTIS Mock AIME | 95.6% | 81.7% | Gemini 3.1 Pro Preview |
| FrontierMath, tiers 1 to 3 | 59.6% | 36.1% | Gemini 3.1 Pro Preview |
| FrontierMath, tier 4 | 26.8% | 4.9% | Gemini 3.1 Pro Preview |
| ProofBench | 26.0% | Not measured | Only Gemini 3.1 Pro Preview measured |
| MATH level 5 | Not measured | 97.8% | Only o4 Mini measured |
| LMArena Text: math | 1486 | 1389 | Gemini 3.1 Pro Preview |
| LMArena Text: mathematical work | 1478 | 1379 | Gemini 3.1 Pro Preview |
| Neither model has a result on the other 1 board here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index121
| Benchmark | Gemini 3.1 Pro Preview | o4 Mini | Leader |
|---|---|---|---|
| MMLU Pro | 91.0% | 80.6% | Gemini 3.1 Pro Preview |
| LegalBench (Vals AI) | 87.4% | 79.2% | Gemini 3.1 Pro Preview |
| CaseLaw (Vals AI) | 64.8% | Not measured | Only Gemini 3.1 Pro Preview measured |
| CorpFin (Vals AI) | 64.5% | 59.0% | Gemini 3.1 Pro Preview |
| TaxEval (Vals AI) | 72.9% | 74.8% | o4 Mini |
| MortgageTax (Vals AI) | 69.4% | 64.8% | Gemini 3.1 Pro Preview |
| MedQA (Vals AI) | 96.4% | 96.0% | Gemini 3.1 Pro Preview |
| MedCode (Vals AI) | 59.1% | 33.8% | Gemini 3.1 Pro Preview |
| MMLU Pro (Artificial Analysis run) | Not measured | 83.2% | Only o4 Mini measured |
| SimpleQA Verified | 73.5% | 19.6% | Gemini 3.1 Pro Preview |
| GeoBench | Not measured | 64.0% | Only o4 Mini measured |
| LMArena Text: science | 1497 | 1354 | Gemini 3.1 Pro Preview |
| LMArena Text: medicine and healthcare | 1486 | 1361 | Gemini 3.1 Pro Preview |
| LMArena Text: legal and government | 1487 | 1350 | Gemini 3.1 Pro Preview |
| LMArena Text: business and finance | 1459 | 1325 | Gemini 3.1 Pro Preview |
| FACTS Benchmark Suite | 67.4% | 28.1% | Gemini 3.1 Pro Preview |
| Neither model has a result on the other 2 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index60
| Benchmark | Gemini 3.1 Pro Preview | o4 Mini | Leader |
|---|---|---|---|
| Design Arena: websites | 1234 | 985 | Gemini 3.1 Pro Preview |
| Design Arena: UI components | 1227 | 983 | Gemini 3.1 Pro Preview |
| Design Arena: game dev | 1203 | 1003 | Gemini 3.1 Pro Preview |
| Design Arena: data viz | 1209 | 990 | Gemini 3.1 Pro Preview |
| Design Arena: 3D | 1234 | 854 | Gemini 3.1 Pro Preview |
| Design Arena: all code categories | 1231 | 976 | Gemini 3.1 Pro Preview |
| Design Arena: SVG | 1285 | Not measured | Only Gemini 3.1 Pro Preview measured |
| Design Arena: ASCII art | 1270 | Not measured | Only Gemini 3.1 Pro Preview measured |
| Neither model has a result on the other 1 board here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index310
| Benchmark | Gemini 3.1 Pro Preview | o4 Mini | Leader |
|---|---|---|---|
| Public Benefits Bench (Vals AI) | 53.8% | Not measured | Only Gemini 3.1 Pro Preview measured |
| SAGE (Vals AI) | 48.7% | 41.1% | Gemini 3.1 Pro Preview |
| MedScribe (Vals AI) | 76.1% | 69.1% | Gemini 3.1 Pro Preview |
| Vals Multimodal Index | 56.1% | Not measured | Only Gemini 3.1 Pro Preview measured |
| IFBench | 77.1% | 68.7% | Gemini 3.1 Pro Preview |
| Long context reasoning (AA-LCR) | 82.0% | 61.0% | Gemini 3.1 Pro Preview |
| DTBench | 97.1% | 77.6% | Gemini 3.1 Pro Preview |
| LMCA | 53.8% | 26.5% | Gemini 3.1 Pro Preview |
| Fiction.LiveBench | Not measured | 77.8% | Only o4 Mini measured |
| Creative writing (Lech Mazur) | Not measured | 75.0% | Only o4 Mini measured |
| CL-bench | 20.8% | Not measured | Only Gemini 3.1 Pro Preview measured |
| Furniture assembly | 26.7% | Not measured | Only Gemini 3.1 Pro Preview measured |
| ExploitBench | 26.1% | Not measured | Only Gemini 3.1 Pro Preview measured |
| CL-bench Life | 16.9% | Not measured | Only Gemini 3.1 Pro Preview measured |
| LMArena Text | 1480 | 1353 | Gemini 3.1 Pro Preview |
| LMArena Text: instruction following | 1466 | 1320 | Gemini 3.1 Pro Preview |
| LMArena Text: creative writing | 1482 | 1294 | Gemini 3.1 Pro Preview |
| LMArena Vision | 1296 | 1194 | Gemini 3.1 Pro Preview |
| LMArena Text: English | 1478 | 1367 | Gemini 3.1 Pro Preview |
| LMArena Text: non-English | 1476 | 1337 | Gemini 3.1 Pro Preview |
| LMArena Text: Chinese | 1527 | 1354 | Gemini 3.1 Pro Preview |
| LMArena Text: German | 1490 | 1336 | Gemini 3.1 Pro Preview |
| LMArena Text: Japanese | 1491 | 1308 | Gemini 3.1 Pro Preview |
| LMArena Text: Korean | 1455 | 1312 | Gemini 3.1 Pro Preview |
| LMArena Text: French | 1487 | 1364 | Gemini 3.1 Pro Preview |
| LMArena Text: Spanish | 1481 | 1346 | Gemini 3.1 Pro Preview |
| LMArena Text: Russian | 1497 | 1334 | Gemini 3.1 Pro Preview |
| LMArena Text: Polish | 1498 | 1358 | Gemini 3.1 Pro Preview |
| LMArena Text: multi-turn | 1487 | 1350 | Gemini 3.1 Pro Preview |
| LMArena Text: longer queries | 1482 | 1315 | Gemini 3.1 Pro Preview |
| LMArena Text: writing and language | 1481 | 1316 | Gemini 3.1 Pro Preview |
| LMArena Text: entertainment and media | 1465 | 1308 | Gemini 3.1 Pro Preview |
| LMArena Vision: English | 1287 | 1200 | Gemini 3.1 Pro Preview |
| LMArena Vision: Chinese | 1364 | 1218 | Gemini 3.1 Pro Preview |
| LMArena Vision: reading text | 1304 | 1197 | Gemini 3.1 Pro Preview |
| LMArena Vision: humor | 1322 | 1199 | Gemini 3.1 Pro Preview |
| LMArena Vision: captioning | 1345 | 1204 | Gemini 3.1 Pro Preview |
| LMArena Vision: recognizing things | 1330 | 1218 | Gemini 3.1 Pro Preview |
| LMArena Vision: creative writing | 1324 | 1166 | Gemini 3.1 Pro Preview |
| LMArena Document | 1444 | Not measured | Only Gemini 3.1 Pro Preview measured |
| Neither model has a result on the other 6 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Gemini 3.1 Pro Preview | o4 Mini | 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 Pro Preview$0.0080Fits in one request
o4 Mini$0.0033Fits in one request
o4 Mini costs less
Repository review
50K input + 3K output tokens
Gemini 3.1 Pro Preview$0.136Fits in one request
o4 Mini$0.068Fits in one request
o4 Mini costs less
Agent loop
200K input + 10K output tokens
Gemini 3.1 Pro Preview$0.520Fits in one request
o4 Mini$0.264Exceeds the context window
o4 Mini 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 Pro Preview | OpenAI o4 Mini |
|---|---|---|
| Maker | OpenAI | |
| Weights | No public weights listed | No public weights listed |
| Released | February 19, 2026 | April 16, 2025 |
| Context window | 1.05M | 200K |
| Input $/Mtok | $2.00 | $1.10 |
| Output $/Mtok | $12.00 | $4.40 |
| Coding index | 32.3 | Not benchmarked |
| Independent measurements behind it | 4 | 0 |
| Cost per solved task | $0.99 | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Gemini 3.1 Pro Preview better than o4 Mini for coding?
Only Gemini 3.1 Pro Preview has a coding score, 32.3 on the Vibe Coding Index; o4 Mini has none, so the two cannot be ranked on coding. Pick o4 Mini for output tokens 2.7x cheaper ($4.40 vs $12.00 per million) and work measured by TaxEval (Vals AI), where it leads.
Which is cheaper, Gemini 3.1 Pro Preview or o4 Mini?
Gemini 3.1 Pro Preview costs $2.00 per million input tokens and $12.00 per million output tokens; o4 Mini costs $1.10 and $4.40. Cost per solved task is known for Gemini 3.1 Pro Preview only.
Which has the bigger context window, Gemini 3.1 Pro Preview or o4 Mini?
Gemini 3.1 Pro Preview, with 1.05M tokens against 200K.
How many benchmarks is the Gemini 3.1 Pro Preview vs o4 Mini comparison based on?
81 benchmarks have a result for both models as of October 21, 2026. Gemini 3.1 Pro Preview's coding index rests on 4 independent benchmarks and o4 Mini's on 0. Where only one model has a result, the page says so instead of naming a winner.