Gemini 3.1 Flash Lite Preview vs o3
o3 leads Gemini 3.1 Flash Lite Preview on the Artificial Analysis Intelligence Index, 20.2 to 15.6, and Gemini 3.1 Flash Lite Preview costs 5.3x less per output token ($1.50 vs $8.00 per million). Updated October 22, 2026; 59 benchmarks have a result for both.
Gemini 3.1 Flash Lite Preview or o3: which to pick
Only Gemini 3.1 Flash Lite Preview has a coding score, 22.7 on the Vibe Coding Index; o3 has none, so the two cannot be ranked on coding.
Pick o3 for work measured by LiveCodeBench (Vals AI) or ALE-Bench, where it leads.
- Shared results
- 59
- Gemini 3.1 Flash Lite Preview only
- 20
- o3 only
- 43
- 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
Only Gemini 3.1 Flash Lite Preview has a coding score, so no call is made.
One side not measured
Intelligence
AA Intelligence Index
o3
o3 leads, 20.2 against 15.6.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Gemini 3.1 Flash Lite Preview has a AA Agentic Index result, 1.6.
Directional only
Reasoning
GPQA Diamond
o3
o3 leads, 84.1% against 81.1%.
Same board, both measured
Math
AIME
o3
o3 leads, 85.3% against 83.3%.
Same board, both measured
Knowledge
MMLU Pro
Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite Preview leads, 86.2% against 85.6%.
Same board, both measured
Web design
Design Arena: websites
Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite Preview leads, 1082 against 1036.
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 200K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite Preview $0.0010, o3 $0.0060 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, o3 $0.571.
Published attempt cost and pass rate
At a glance
- Coding index
- Gemini 3.1 Flash Lite Preview 22.7 from 3 benchmarks, o3 not benchmarked.
- Widest category
- Web design, 7.8 points apart on average over 5 shared benchmarks.
- Widest single gap
- Design Arena: data viz: Gemini 3.1 Flash Lite Preview 1045 against o3 1200, 19.4 points apart on a 0 to 100 scale.
- Output price
- Gemini 3.1 Flash Lite Preview $1.50 against o3 $8.00 per million output tokens, 5.3x apart.
- Context window
- Gemini 3.1 Flash Lite Preview takes 1.05M tokens, o3 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 Flash Lite Preview | Bars | o3 | Ties |
|---|---|---|---|---|
| Coding | 0 | 5 | ||
| Intelligence | 0 | 1 | ||
| Reasoning | 4 | 3 | ||
| Math | 1 | 2 | ||
| Knowledge | 4 | 6 | 1 tie | |
| Web design | 3 | 2 | ||
| General | 24 | 3 | ||
| All shared boards | 36 | 22 | 1 tie |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index05
| Benchmark | Gemini 3.1 Flash Lite Preview | o3 | Leader |
|---|---|---|---|
| Aider polyglot | Not measured | 81.3% | Only o3 measured |
| SWE-bench Verified | Not measured | 58.4% | Only o3 measured |
| SWE-bench Multimodal | Not measured | 36.0% | Only o3 measured |
| LMArena WebDev | 1257 | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| AA Coding Index | 34.7 | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| LiveCodeBench (Vals AI) | 80.1% | 83.9% | o3 |
| SWE-bench Verified (Vals AI) | 62.8% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| Vibe Code Bench (Vals AI) | 0.0% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| Code migration (Vals AI) | 4.6% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| ProgramBench (Vals AI) | 0.0% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| Terminal-Bench 2.1 (Vals AI) | 34.1% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| LiveCodeBench (Artificial Analysis run) | Not measured | 80.8% | Only o3 measured |
| Terminal-Bench Hard (Artificial Analysis run) | Not measured | 37.1% | Only o3 measured |
| GSO-Bench | Not measured | 8.8% | Only o3 measured |
| WeirdML | Not measured | 52.4% | Only o3 measured |
| ALE-Bench | 797.7 | 933.5 | o3 |
| LMArena Text: coding | 1400 | 1407 | o3 |
| LMArena Text: software and IT | 1413 | 1415 | o3 |
| LMArena WebDev: React | 1245 | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena WebDev: HTML | 1276 | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena WebDev: from an image | 1336 | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| SciCode | 4.6% | 9.2% | o3 |
| Neither model has a result on the other 17 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | Gemini 3.1 Flash Lite Preview | o3 | Leader |
|---|---|---|---|
| AA Intelligence Index | 15.6 | 20.2 | o3 |
| Epoch Capabilities Index | Not measured | 146.7 | Only o3 measured |
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index12 boards, none shared
| Benchmark | Gemini 3.1 Flash Lite Preview | o3 | Leader |
|---|---|---|---|
| AA Agentic Index | 1.6 | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| Finance Agent (Vals AI) | 30.0% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| Tax Agent Bench (Vals AI) | 3.1% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| Legal Research Bench (Vals AI) | 3.4% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| Excel Modeling Benchmark (Vals AI) | 8.6% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| τ²-Bench Telecom | Not measured | 80.7% | Only o3 measured |
| METR time horizons | Not measured | 65.4% | Only o3 measured |
| GDPval | Not measured | 30.8% | Only o3 measured |
| DeepResearch Bench | Not measured | 45.2% | Only o3 measured |
| OSWorld | Not measured | 23.0% | Only o3 measured |
| Berkeley Function Calling Leaderboard (BFCL) | Not measured | 63.0% | Only o3 measured |
| BrowseComp-Plus | Not measured | 65.9% | Only o3 measured |
| Neither model has a result on the other 29 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index43
| Benchmark | Gemini 3.1 Flash Lite Preview | o3 | Leader |
|---|---|---|---|
| GPQA Diamond | 81.1% | 84.1% | o3 |
| MMMU Pro (Vals AI) | 82.5% | 80.4% | Gemini 3.1 Flash Lite Preview |
| GPQA Diamond (Artificial Analysis run) | Not measured | 82.7% | Only o3 measured |
| Humanity's Last Exam (Artificial Analysis run) | Not measured | 20.1% | Only o3 measured |
| GPQA Diamond (Epoch AI run) | Not measured | 81.8% | Only o3 measured |
| ARC-AGI | Not measured | 60.8% | Only o3 measured |
| ARC-AGI-2 | Not measured | 6.5% | Only o3 measured |
| SimpleBench | Not measured | 53.1% | Only o3 measured |
| Chess puzzles | Not measured | 37.0% | Only o3 measured |
| Mystery game puzzles | Not measured | 29.0% | Only o3 measured |
| VPCT | Not measured | 52.0% | Only o3 measured |
| LMArena Text: hard prompts | 1407 | 1402 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: expert | 1398 | 1402 | o3 |
| LMArena Text: hard prompts in English | 1403 | 1411 | o3 |
| LMArena Vision: diagrams | 1242 | 1220 | Gemini 3.1 Flash Lite Preview |
| LMArena Vision: homework | 1271 | 1234 | Gemini 3.1 Flash Lite Preview |
| Kagi LLM Benchmark | Not measured | 67.6% | Only o3 measured |
| Neither model has a result on the other 5 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index12
| Benchmark | Gemini 3.1 Flash Lite Preview | o3 | Leader |
|---|---|---|---|
| AIME | 83.3% | 85.3% | o3 |
| MATH 500 (Vals AI) | Not measured | 94.6% | Only o3 measured |
| MGSM (Vals AI) | Not measured | 91.8% | Only o3 measured |
| AA Math Index | Not measured | 88.3 | Only o3 measured |
| AIME 2025 (Artificial Analysis run) | Not measured | 88.3% | Only o3 measured |
| OTIS Mock AIME | Not measured | 84.4% | Only o3 measured |
| FrontierMath, tiers 1 to 3 | Not measured | 33.3% | Only o3 measured |
| MATH level 5 | Not measured | 97.8% | Only o3 measured |
| LMArena Text: math | 1428 | 1426 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: mathematical work | 1417 | 1423 | o3 |
| Neither model has a result on the other 3 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index46
| Benchmark | Gemini 3.1 Flash Lite Preview | o3 | Leader |
|---|---|---|---|
| MMLU Pro | 86.2% | 85.6% | Gemini 3.1 Flash Lite Preview |
| LegalBench (Vals AI) | 83.8% | 83.8% | Tie |
| CaseLaw (Vals AI) | 55.0% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| CorpFin (Vals AI) | 59.4% | 59.7% | o3 |
| TaxEval (Vals AI) | 71.8% | 74.6% | o3 |
| MortgageTax (Vals AI) | 68.0% | 65.7% | Gemini 3.1 Flash Lite Preview |
| MedQA (Vals AI) | Not measured | 96.1% | Only o3 measured |
| MedCode (Vals AI) | 47.6% | 47.3% | Gemini 3.1 Flash Lite Preview |
| MMLU Pro (Artificial Analysis run) | Not measured | 85.3% | Only o3 measured |
| SimpleQA Verified | Not measured | 49.4% | Only o3 measured |
| GeoBench | Not measured | 74.0% | Only o3 measured |
| LMArena Text: science | 1425 | 1429 | o3 |
| LMArena Text: medicine and healthcare | 1428 | 1448 | o3 |
| LMArena Text: legal and government | 1418 | 1428 | o3 |
| LMArena Text: business and finance | 1389 | 1393 | o3 |
| FACTS Benchmark Suite | 51.4% | 44.4% | Gemini 3.1 Flash Lite Preview |
| Neither model has a result on the other 2 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index32
| Benchmark | Gemini 3.1 Flash Lite Preview | o3 | Leader |
|---|---|---|---|
| Design Arena: websites | 1082 | 1036 | Gemini 3.1 Flash Lite Preview |
| Design Arena: UI components | 1069 | 1017 | Gemini 3.1 Flash Lite Preview |
| Design Arena: game dev | 1029 | 1034 | o3 |
| Design Arena: data viz | 1045 | 1200 | o3 |
| Design Arena: 3D | 1047 | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| Design Arena: all code categories | 1072 | 1020 | Gemini 3.1 Flash Lite Preview |
| Design Arena: SVG | 1052 | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| Design Arena: ASCII art | 1167 | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| Neither model has a result on the other 1 board here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index243
| Benchmark | Gemini 3.1 Flash Lite Preview | o3 | Leader |
|---|---|---|---|
| SAGE (Vals AI) | 49.5% | 41.8% | Gemini 3.1 Flash Lite Preview |
| MedScribe (Vals AI) | 63.9% | 76.7% | o3 |
| Vals Multimodal Index | 41.4% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| IFBench | Not measured | 71.4% | Only o3 measured |
| Long context reasoning (AA-LCR) | Not measured | 74.7% | Only o3 measured |
| DTBench | Not measured | 84.8% | Only o3 measured |
| LMCA | Not measured | 39.7% | Only o3 measured |
| Fiction.LiveBench | Not measured | 88.9% | Only o3 measured |
| Creative writing (Lech Mazur) | Not measured | 83.9% | Only o3 measured |
| CL-bench | Not measured | 17.8% | Only o3 measured |
| LMArena Text | 1416 | 1410 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: instruction following | 1377 | 1368 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: creative writing | 1401 | 1359 | Gemini 3.1 Flash Lite Preview |
| LMArena Vision | 1240 | 1214 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: English | 1414 | 1417 | o3 |
| LMArena Text: non-English | 1410 | 1401 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: Chinese | 1460 | 1437 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: German | 1430 | 1420 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: Japanese | 1413 | 1403 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: Korean | 1392 | 1370 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: French | 1424 | 1430 | o3 |
| LMArena Text: Spanish | 1421 | 1395 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: Russian | 1420 | 1406 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: Polish | 1443 | 1438 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: multi-turn | 1417 | 1405 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: longer queries | 1394 | 1372 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: writing and language | 1408 | 1372 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: entertainment and media | 1386 | 1373 | Gemini 3.1 Flash Lite Preview |
| LMArena Vision: English | 1232 | 1221 | Gemini 3.1 Flash Lite Preview |
| LMArena Vision: Chinese | 1278 | 1237 | Gemini 3.1 Flash Lite Preview |
| LMArena Vision: reading text | 1246 | 1218 | Gemini 3.1 Flash Lite Preview |
| LMArena Vision: humor | 1266 | 1222 | Gemini 3.1 Flash Lite Preview |
| LMArena Vision: captioning | 1259 | 1210 | Gemini 3.1 Flash Lite Preview |
| LMArena Vision: recognizing things | 1308 | 1234 | Gemini 3.1 Flash Lite Preview |
| LMArena Vision: creative writing | 1248 | 1201 | Gemini 3.1 Flash Lite Preview |
| Neither model has a result on the other 11 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Gemini 3.1 Flash Lite Preview | o3 | 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 | OpenAI o3 |
|---|---|---|
| Maker | OpenAI | |
| Weights | No public weights listed | No public weights listed |
| Released | March 3, 2026 | April 16, 2025 |
| Context window | 1.05M | 200K |
| Input $/Mtok | $0.25 | $2.00 |
| Output $/Mtok | $1.50 | $8.00 |
| Coding index | 22.7 | Not benchmarked |
| Independent measurements behind it | 3 | 0 |
| Cost per solved task | $0.18 | $0.571 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Gemini 3.1 Flash Lite Preview better than o3 for coding?
Only Gemini 3.1 Flash Lite Preview has a coding score, 22.7 on the Vibe Coding Index; o3 has none, so the two cannot be ranked on coding. Pick o3 for work measured by LiveCodeBench (Vals AI) or ALE-Bench, where it leads.
Which is cheaper, Gemini 3.1 Flash Lite Preview or o3?
Gemini 3.1 Flash Lite Preview costs $0.25 per million input tokens and $1.50 per million output tokens; o3 costs $2.00 and $8.00. Per solved SWE-bench Verified task, Gemini 3.1 Flash Lite Preview costs $0.18 and o3 $0.571.
Which has the bigger context window, Gemini 3.1 Flash Lite Preview or o3?
Gemini 3.1 Flash Lite Preview, with 1.05M tokens against 200K.
How many benchmarks is the Gemini 3.1 Flash Lite Preview vs o3 comparison based on?
59 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 o3's on 0. Where only one model has a result, the page says so instead of naming a winner.