Gemini 3.1 Flash Lite Preview vs gpt-oss-120b
Updated October 21, 2026. 47 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.
Decision reading
Pick gpt-oss-120b for coding: it scores 34.5 on the Vibe Coding Index against 8.1 for Gemini 3.1 Flash Lite Preview.
Pick Gemini 3.1 Flash Lite Preview when a solved task costs $0.18 against $0.51, or when the context window is larger, 1.05M against 131K tokens.
- Shared results
- 47
- Gemini 3.1 Flash Lite Preview only
- 30
- gpt-oss-120b only
- 31
- Like-for-like categories
- 8 of 9
Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.
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, four public coding benchmarks
gpt-oss-120b
gpt-oss-120b scores 34.5 against 8.1.
1 and 2 benchmarks behind the scores
Intelligence
AA Intelligence Index
Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite Preview leads, 15.6 against 11.6.
Same board, both measured
Agentic work
AA Agentic Index
gpt-oss-120b
gpt-oss-120b leads, 3.7 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 78.5%.
Same board, both measured
Math
AIME
gpt-oss-120b
gpt-oss-120b leads, 92.6% 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 79.2%.
Same board, both measured
Web design
Design Arena: websites
Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite Preview leads, 1083 against 968.
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 131K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
gpt-oss-120b
Gemini 3.1 Flash Lite Preview $0.0010, gpt-oss-120b $0.0004 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, gpt-oss-120b $0.51.
Published attempt cost and pass rate
At a glance
- Coding index
- Gemini 3.1 Flash Lite Preview 8.1 from 1 benchmark, gpt-oss-120b 34.5 from 2 benchmarks.
- Widest category
- Web design, 12.7 points apart on average over 6 shared benchmarks.
- Widest single gap
- SWE-bench Verified (Vals AI): Gemini 3.1 Flash Lite Preview 62.8% against gpt-oss-120b 33.6%, 29.2 points apart on a 0 to 100 scale.
- Output price
- Gemini 3.1 Flash Lite Preview $1.50 against gpt-oss-120b $0.60 per million output tokens, 2.5x apart.
- Context window
- Gemini 3.1 Flash Lite Preview takes 1.05M tokens, gpt-oss-120b 131K.
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 | gpt-oss-120b | Ties |
|---|---|---|---|---|
| Coding | 5 | 1 | ||
| Intelligence | 1 | 0 | ||
| Agentic work | 0 | 1 | ||
| Reasoning | 4 | 0 | ||
| Math | 2 | 1 | ||
| Knowledge | 9 | 0 | ||
| Web design | 6 | 0 | ||
| General | 17 | 0 | ||
| All shared boards | 44 | 3 |
CodingLike-for-likeFour of these boards feed the Vibe Coding Index51
| Benchmark | Gemini 3.1 Flash Lite Preview | gpt-oss-120b | Leader |
|---|---|---|---|
| Aider polyglot | Not measured | 41.8% | Only gpt-oss-120b measured |
| SWE-bench Verified | Not measured | 26.0% | Only gpt-oss-120b measured |
| LMArena WebDev | 1257 | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| AA Coding Index | 34.7 | 30.4 | Gemini 3.1 Flash Lite Preview |
| LiveCodeBench (Vals AI) | 80.1% | 83.2% | gpt-oss-120b |
| SWE-bench Verified (Vals AI) | 62.8% | 33.6% | Gemini 3.1 Flash Lite Preview |
| 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 | 87.8% | Only gpt-oss-120b measured |
| SciCode | Not measured | 34.0% | Only gpt-oss-120b measured |
| Terminal-Bench Hard (Artificial Analysis run) | Not measured | 23.5% | Only gpt-oss-120b measured |
| Terminal-Bench | Not measured | 18.7% | Only gpt-oss-120b measured |
| WeirdML | Not measured | 48.2% | Only gpt-oss-120b measured |
| ALE-Bench | 797.7 | 575.6 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: coding | 1400 | 1379 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: software and IT | 1413 | 1387 | Gemini 3.1 Flash Lite Preview |
| 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 |
| Neither model has a result on the other 17 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Gemini 3.1 Flash Lite Preview | gpt-oss-120b | Leader |
|---|---|---|---|
| AA Intelligence Index | 15.6 | 11.6 | Gemini 3.1 Flash Lite Preview |
| Epoch Capabilities Index | Not measured | 139.8 | Only gpt-oss-120b measured |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | Gemini 3.1 Flash Lite Preview | gpt-oss-120b | Leader |
|---|---|---|---|
| AA Agentic Index | 1.6 | 3.7 | gpt-oss-120b |
| 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 | 65.8% | Only gpt-oss-120b measured |
| APEX-Agents | Not measured | 4.4% | Only gpt-oss-120b measured |
| METR time horizons | Not measured | 56.6% | Only gpt-oss-120b measured |
| Vending-Bench 2 | Not measured | -$22 | Only gpt-oss-120b measured |
| Neither model has a result on the other 30 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index40
| Benchmark | Gemini 3.1 Flash Lite Preview | gpt-oss-120b | Leader |
|---|---|---|---|
| GPQA Diamond | 81.1% | 78.5% | 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 | 78.2% | Only gpt-oss-120b measured |
| Humanity's Last Exam (Artificial Analysis run) | Not measured | 19.6% | Only gpt-oss-120b measured |
| GPQA Diamond (Epoch AI run) | Not measured | 75.8% | Only gpt-oss-120b measured |
| SimpleBench | Not measured | 22.1% | Only gpt-oss-120b measured |
| Mystery game puzzles | Not measured | 2.0% | Only gpt-oss-120b measured |
| LMArena Text: hard prompts | 1407 | 1364 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: expert | 1398 | 1356 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: hard prompts in English | 1403 | 1368 | Gemini 3.1 Flash Lite Preview |
| LMArena Vision: diagrams | 1242 | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena Vision: homework | 1271 | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| Neither model has a result on the other 9 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index21
| Benchmark | Gemini 3.1 Flash Lite Preview | gpt-oss-120b | Leader |
|---|---|---|---|
| AIME | 83.3% | 92.6% | gpt-oss-120b |
| MATH 500 (Vals AI) | Not measured | 94.8% | Only gpt-oss-120b measured |
| MGSM (Vals AI) | Not measured | 92.0% | Only gpt-oss-120b measured |
| AA Math Index | Not measured | 93.4 | Only gpt-oss-120b measured |
| AIME 2025 (Artificial Analysis run) | Not measured | 93.4% | Only gpt-oss-120b measured |
| OTIS Mock AIME | Not measured | 88.9% | Only gpt-oss-120b measured |
| LMArena Text: math | 1428 | 1389 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: mathematical work | 1417 | 1386 | Gemini 3.1 Flash Lite Preview |
| Neither model has a result on the other 5 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index90
| Benchmark | Gemini 3.1 Flash Lite Preview | gpt-oss-120b | Leader |
|---|---|---|---|
| MMLU Pro | 86.2% | 79.2% | Gemini 3.1 Flash Lite Preview |
| LegalBench (Vals AI) | 83.8% | 75.9% | Gemini 3.1 Flash Lite Preview |
| CaseLaw (Vals AI) | 55.0% | 48.8% | Gemini 3.1 Flash Lite Preview |
| CorpFin (Vals AI) | 59.4% | 58.2% | Gemini 3.1 Flash Lite Preview |
| TaxEval (Vals AI) | 71.8% | 71.6% | Gemini 3.1 Flash Lite Preview |
| MortgageTax (Vals AI) | 68.0% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| MedQA (Vals AI) | Not measured | 91.4% | Only gpt-oss-120b measured |
| MedCode (Vals AI) | 47.6% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| MMLU Pro (Artificial Analysis run) | Not measured | 80.8% | Only gpt-oss-120b measured |
| LMArena Text: science | 1425 | 1382 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: medicine and healthcare | 1428 | 1388 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: legal and government | 1418 | 1355 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: business and finance | 1389 | 1359 | Gemini 3.1 Flash Lite Preview |
| Neither model has a result on the other 4 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index60
| Benchmark | Gemini 3.1 Flash Lite Preview | gpt-oss-120b | Leader |
|---|---|---|---|
| Design Arena: websites | 1083 | 968 | Gemini 3.1 Flash Lite Preview |
| Design Arena: UI components | 1071 | 927 | Gemini 3.1 Flash Lite Preview |
| Design Arena: game dev | 1029 | 992 | Gemini 3.1 Flash Lite Preview |
| Design Arena: data viz | 1045 | 987 | Gemini 3.1 Flash Lite Preview |
| Design Arena: 3D | 1048 | 901 | Gemini 3.1 Flash Lite Preview |
| Design Arena: all code categories | 1072 | 963 | Gemini 3.1 Flash Lite Preview |
| Design Arena: SVG | 1052 | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| Design Arena: ASCII art | 1166 | 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 index170
| Benchmark | Gemini 3.1 Flash Lite Preview | gpt-oss-120b | Leader |
|---|---|---|---|
| SAGE (Vals AI) | 49.5% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| MedScribe (Vals AI) | 63.9% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| Vals Multimodal Index | 41.4% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| IFBench | Not measured | 69.0% | Only gpt-oss-120b measured |
| Long context reasoning (AA-LCR) | Not measured | 52.0% | Only gpt-oss-120b measured |
| DTBench | Not measured | 76.3% | Only gpt-oss-120b measured |
| LMCA | Not measured | 22.1% | Only gpt-oss-120b measured |
| Fiction.LiveBench | Not measured | 44.4% | Only gpt-oss-120b measured |
| Creative writing (Lech Mazur) | Not measured | 77.1% | Only gpt-oss-120b measured |
| Surface Evolver Bench | Not measured | 25.0% | Only gpt-oss-120b measured |
| LMArena Text | 1416 | 1366 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: instruction following | 1377 | 1318 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: creative writing | 1401 | 1274 | Gemini 3.1 Flash Lite Preview |
| LMArena Vision | 1240 | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena Text: English | 1414 | 1375 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: non-English | 1410 | 1351 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: Chinese | 1460 | 1385 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: German | 1430 | 1353 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: Japanese | 1413 | 1331 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: Korean | 1392 | 1282 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: French | 1424 | 1370 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: Spanish | 1421 | 1389 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: Russian | 1420 | 1343 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: Polish | 1443 | 1353 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: multi-turn | 1417 | 1340 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: longer queries | 1394 | 1319 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: writing and language | 1408 | 1306 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: entertainment and media | 1386 | 1292 | Gemini 3.1 Flash Lite Preview |
| LMArena Vision: English | 1232 | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena Vision: Chinese | 1278 | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena Vision: reading text | 1246 | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| LMArena Vision: humor | 1266 | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| 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 | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| 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 | gpt-oss-120b | 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
gpt-oss-120b costs less
Repository review
50K input + 3K output tokens
gpt-oss-120b costs less
Agent loop
200K input + 10K output tokens
gpt-oss-120b 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 gpt-oss-120b |
|---|---|---|
| Maker | OpenAI | |
| Weights | No public weights listed | Open weights |
| Released | March 3, 2026 | August 5, 2025 |
| Context window | 1.05M | 131K |
| Input $/Mtok | $0.25 | $0.15 |
| Output $/Mtok | $1.50 | $0.60 |
| Coding index | 8.1 | 34.5 |
| Independent measurements behind it | 1 | 2 |
| Cost per solved task | $0.18 | $0.51 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Gemini 3.1 Flash Lite Preview better than gpt-oss-120b for coding?
Pick gpt-oss-120b for coding: it scores 34.5 on the Vibe Coding Index against 8.1 for Gemini 3.1 Flash Lite Preview. Pick Gemini 3.1 Flash Lite Preview when a solved task costs $0.18 against $0.51, or when the context window is larger, 1.05M against 131K tokens.
Which is cheaper, Gemini 3.1 Flash Lite Preview or gpt-oss-120b?
Gemini 3.1 Flash Lite Preview costs $0.25 per million input tokens and $1.50 per million output tokens; gpt-oss-120b costs $0.15 and $0.60. Per solved SWE-bench Verified task, Gemini 3.1 Flash Lite Preview costs $0.18 and gpt-oss-120b $0.51.
Which has the bigger context window, Gemini 3.1 Flash Lite Preview or gpt-oss-120b?
Gemini 3.1 Flash Lite Preview, with 1.05M tokens against 131K.
How many benchmarks is the Gemini 3.1 Flash Lite Preview vs gpt-oss-120b comparison based on?
47 benchmarks have a result for both models as of October 21, 2026. Gemini 3.1 Flash Lite Preview's coding index rests on 1 independent benchmark and gpt-oss-120b's on 2. Where only one model has a result, the page says so instead of naming a winner.