Gemini 3.8 Flash vs GPT-4.1
Gemini 3.8 Flash leads GPT-4.1 on the Artificial Analysis Intelligence Index, 40.9 to 12.7, and Gemini 3.8 Flash costs 2.1x less per output token ($3.75 vs $8.00 per million). Updated October 22, 2026; 67 benchmarks have a result for both.
Gemini 3.8 Flash or GPT-4.1: which to pick
Only Gemini 3.8 Flash has a coding score, 61.6 on the Vibe Coding Index; GPT-4.1 has none, so the two cannot be ranked on coding.
Pick GPT-4.1 for a lower cost per solved task ($0.37 against $2.74) and work measured by TaxEval (Vals AI) or MortgageTax (Vals AI), where it leads.
- Shared results
- 67
- Gemini 3.8 Flash only
- 61
- GPT-4.1 only
- 25
- 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 3.8 Flash has a coding score, so no call is made.
One side not measured
Intelligence
AA Intelligence Index
Gemini 3.8 Flash
Gemini 3.8 Flash leads, 40.9 against 12.7.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Gemini 3.8 Flash has a AA Agentic Index result, 40.2.
Directional only
Reasoning
GPQA Diamond
Gemini 3.8 Flash
Gemini 3.8 Flash leads, 94.4% against 65.4%.
Same board, both measured
Math
AIME
No call
Only GPT-4.1 has a AIME result, 39.6%.
Directional only
Knowledge
MMLU Pro
Gemini 3.8 Flash
Gemini 3.8 Flash leads, 90.2% against 80.5%.
Same board, both measured
Web design
Design Arena: websites
Gemini 3.8 Flash
Gemini 3.8 Flash leads, 1300 against 1038.
Same board, both measured
General
Vals Index
No call
Only Gemini 3.8 Flash has a Vals Index result, 56.0%.
Directional only
Long documents
Listed context window
Gemini 3.8 Flash
Gemini 3.8 Flash takes 1.05M tokens against 1.05M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Gemini 3.8 Flash
Gemini 3.8 Flash $0.0026, GPT-4.1 $0.0060 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
GPT-4.1
Gemini 3.8 Flash $2.74, GPT-4.1 $0.37.
Published attempt cost and pass rate
At a glance
- Coding index
- Gemini 3.8 Flash 61.6 from 6 benchmarks, GPT-4.1 not benchmarked.
- Widest category
- Math, 44.1 points apart on average over 4 shared benchmarks.
- Widest single gap
- ARC-AGI: Gemini 3.8 Flash 98.5% against GPT-4.1 5.5%, 93.0 points apart on a 0 to 100 scale.
- Output price
- Gemini 3.8 Flash $3.75 against GPT-4.1 $8.00 per million output tokens, 2.1x apart.
- Context window
- Gemini 3.8 Flash takes 1.05M tokens, GPT-4.1 1.05M.
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 3.8 Flash | Bars | GPT-4.1 | Ties |
|---|---|---|---|---|
| Coding | 6 | 0 | ||
| Intelligence | 2 | 0 | ||
| Reasoning | 13 | 0 | ||
| Math | 4 | 0 | ||
| Knowledge | 8 | 2 | ||
| Web design | 6 | 0 | ||
| General | 26 | 0 | ||
| All shared boards | 65 | 2 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index60
| Benchmark | Gemini 3.8 Flash | GPT-4.1 | Leader |
|---|---|---|---|
| Aider polyglot | Not measured | 52.4% | Only GPT-4.1 measured |
| SWE-bench Verified | Not measured | 39.6% | Only GPT-4.1 measured |
| SWE-bench Multimodal | Not measured | 31.1% | Only GPT-4.1 measured |
| LiveBench coding | 82.2% | Not measured | Only Gemini 3.8 Flash measured |
| LMArena WebDev | 1585 | Not measured | Only Gemini 3.8 Flash measured |
| AA Coding Index | 76.3 | Not measured | Only Gemini 3.8 Flash measured |
| LiveCodeBench (Vals AI) | 89.5% | 54.7% | Gemini 3.8 Flash |
| SWE-bench Verified (Vals AI) | 80.0% | Not measured | Only Gemini 3.8 Flash measured |
| Terminal-Bench 4 (Vals AI) | 19.7% | Not measured | Only Gemini 3.8 Flash measured |
| Vibe Code Bench (Vals AI) | 78.7% | Not measured | Only Gemini 3.8 Flash measured |
| Code migration (Vals AI) | 36.5% | Not measured | Only Gemini 3.8 Flash measured |
| ProgramBench (Vals AI) | 1.0% | Not measured | Only Gemini 3.8 Flash measured |
| IOI (Vals AI) | 56.9% | Not measured | Only Gemini 3.8 Flash measured |
| Terminal-Bench 2.1 (Vals AI) | 81.3% | Not measured | Only Gemini 3.8 Flash measured |
| SWE-bench Multimodal (Vals AI) | 40.8% | Not measured | Only Gemini 3.8 Flash measured |
| Vibe Code Bench 1-100 (Vals AI) | 18.8% | Not measured | Only Gemini 3.8 Flash measured |
| SkillsBench (Vals AI) | 58.0% | Not measured | Only Gemini 3.8 Flash measured |
| CyberBench (Vals AI) | 43.8% | Not measured | Only Gemini 3.8 Flash measured |
| LiveCodeBench (Artificial Analysis run) | Not measured | 45.7% | Only GPT-4.1 measured |
| SciCode | 56.6% | Not measured | Only Gemini 3.8 Flash measured |
| Terminal-Bench Hard (Artificial Analysis run) | Not measured | 13.6% | Only GPT-4.1 measured |
| FrontierCode | 41.2% | Not measured | Only Gemini 3.8 Flash measured |
| FrontierSWE | 19.6% | Not measured | Only Gemini 3.8 Flash measured |
| WeirdML | 84.8% | 39.0% | Gemini 3.8 Flash |
| ALE-Bench | 1269.7 | 558.1 | Gemini 3.8 Flash |
| LMArena Text: coding | 1508 | 1390 | Gemini 3.8 Flash |
| LMArena Text: software and IT | 1507 | 1391 | Gemini 3.8 Flash |
| LMArena WebDev: React | 1577 | Not measured | Only Gemini 3.8 Flash measured |
| LMArena WebDev: HTML | 1616 | Not measured | Only Gemini 3.8 Flash measured |
| LMArena WebDev: from an image | 1593 | Not measured | Only Gemini 3.8 Flash measured |
| SciCode | 12.3% | 4.6% | Gemini 3.8 Flash |
| Neither model has a result on the other 8 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Gemini 3.8 Flash | GPT-4.1 | Leader |
|---|---|---|---|
| AA Intelligence Index | 40.9 | 12.7 | Gemini 3.8 Flash |
| Epoch Capabilities Index | 157.4 | 136.7 | Gemini 3.8 Flash |
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index28 boards, none shared
| Benchmark | Gemini 3.8 Flash | GPT-4.1 | Leader |
|---|---|---|---|
| AA Agentic Index | 40.2 | Not measured | Only Gemini 3.8 Flash measured |
| Design Arena: agents building web apps | 1238 | Not measured | Only Gemini 3.8 Flash measured |
| Design Arena: agents building full-stack apps | 1244 | Not measured | Only Gemini 3.8 Flash measured |
| Design Arena: agents building mobile apps | 1236 | Not measured | Only Gemini 3.8 Flash measured |
| Design Arena: agents building Android apps | 1078 | Not measured | Only Gemini 3.8 Flash measured |
| Design Arena: agents building Godot games | 1273 | Not measured | Only Gemini 3.8 Flash measured |
| Design Arena: PowerPoint slides | 1153 | Not measured | Only Gemini 3.8 Flash measured |
| Design Arena: spreadsheets | 1022 | Not measured | Only Gemini 3.8 Flash measured |
| LiveBench research | 79.1% | Not measured | Only Gemini 3.8 Flash measured |
| LiveBench browser | 64.0% | Not measured | Only Gemini 3.8 Flash measured |
| LiveBench long agentic | 30.1% | Not measured | Only Gemini 3.8 Flash measured |
| SREBench (Vals AI) | 11.1% | Not measured | Only Gemini 3.8 Flash measured |
| Finance Agent (Vals AI) | 61.4% | Not measured | Only Gemini 3.8 Flash measured |
| Tax Agent Bench (Vals AI) | 32.1% | Not measured | Only Gemini 3.8 Flash measured |
| Legal Research Bench (Vals AI) | 38.9% | Not measured | Only Gemini 3.8 Flash measured |
| Harvey's Legal Agent Benchmark (Vals AI) | 12.1% | Not measured | Only Gemini 3.8 Flash measured |
| Excel Modeling Benchmark (Vals AI) | 72.2% | Not measured | Only Gemini 3.8 Flash measured |
| BioMysteryBench (Vals AI) | 62.2% | Not measured | Only Gemini 3.8 Flash measured |
| Terminal-Bench-Science (Vals AI) | 8.6% | Not measured | Only Gemini 3.8 Flash measured |
| Vals Science Index | 35.8% | Not measured | Only Gemini 3.8 Flash measured |
| Time Horizon Index (Vals AI) | 18.8% | Not measured | Only Gemini 3.8 Flash measured |
| CUA-bench (Vals AI) | 4.2% | Not measured | Only Gemini 3.8 Flash measured |
| τ²-Bench Telecom | Not measured | 47.1% | Only GPT-4.1 measured |
| APEX-Agents | 64.3% | Not measured | Only Gemini 3.8 Flash measured |
| Remote Labor Index | 5.8% | Not measured | Only Gemini 3.8 Flash measured |
| Vending-Bench 2 | $5,094 | Not measured | Only Gemini 3.8 Flash measured |
| Berkeley Function Calling Leaderboard (BFCL) | Not measured | 54.0% | Only GPT-4.1 measured |
| BrowseComp-Plus | Not measured | 36.4% | Only GPT-4.1 measured |
| Neither model has a result on the other 13 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index130
| Benchmark | Gemini 3.8 Flash | GPT-4.1 | Leader |
|---|---|---|---|
| GPQA Diamond | 94.4% | 65.4% | Gemini 3.8 Flash |
| LiveBench reasoning | 89.3% | Not measured | Only Gemini 3.8 Flash measured |
| MysteryMechanism (Vals AI) | 36.5% | Not measured | Only Gemini 3.8 Flash measured |
| MMMU Pro (Vals AI) | 89.1% | 72.4% | Gemini 3.8 Flash |
| GPQA Diamond (Artificial Analysis run) | 95.3% | 66.6% | Gemini 3.8 Flash |
| Humanity's Last Exam (Artificial Analysis run) | 47.8% | 4.2% | Gemini 3.8 Flash |
| GPQA Diamond (Epoch AI run) | 95.4% | 66.9% | Gemini 3.8 Flash |
| ARC-AGI | 98.5% | 5.5% | Gemini 3.8 Flash |
| ARC-AGI-2 | 89.2% | 0.4% | Gemini 3.8 Flash |
| SimpleBench | Not measured | 27.0% | Only GPT-4.1 measured |
| Chess puzzles | 58.0% | 3.0% | Gemini 3.8 Flash |
| Mystery game puzzles | 47.0% | Not measured | Only Gemini 3.8 Flash measured |
| LMArena Text: hard prompts | 1509 | 1384 | Gemini 3.8 Flash |
| LMArena Text: expert | 1526 | 1364 | Gemini 3.8 Flash |
| LMArena Text: hard prompts in English | 1504 | 1393 | Gemini 3.8 Flash |
| LMArena Vision: diagrams | 1345 | 1215 | Gemini 3.8 Flash |
| LMArena Vision: homework | 1351 | 1248 | Gemini 3.8 Flash |
| Kagi LLM Benchmark | Not measured | 52.3% | Only GPT-4.1 measured |
| Neither model has a result on the other 4 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index40
| Benchmark | Gemini 3.8 Flash | GPT-4.1 | Leader |
|---|---|---|---|
| AIME | Not measured | 39.6% | Only GPT-4.1 measured |
| MATH 500 (Vals AI) | Not measured | 87.2% | Only GPT-4.1 measured |
| MGSM (Vals AI) | Not measured | 87.7% | Only GPT-4.1 measured |
| AA Math Index | Not measured | 34.7 | Only GPT-4.1 measured |
| AIME 2025 (Artificial Analysis run) | Not measured | 34.7% | Only GPT-4.1 measured |
| OTIS Mock AIME | 98.9% | 38.3% | Gemini 3.8 Flash |
| FrontierMath, tiers 1 to 3 | 68.4% | 6.0% | Gemini 3.8 Flash |
| FrontierMath, tier 4 | 22.0% | Not measured | Only Gemini 3.8 Flash measured |
| ProofBench | 48.0% | Not measured | Only Gemini 3.8 Flash measured |
| MATH level 5 | Not measured | 83.0% | Only GPT-4.1 measured |
| LMArena Text: math | 1532 | 1369 | Gemini 3.8 Flash |
| LMArena Text: mathematical work | 1519 | 1360 | Gemini 3.8 Flash |
| Neither model has a result on the other 1 board here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index82
| Benchmark | Gemini 3.8 Flash | GPT-4.1 | Leader |
|---|---|---|---|
| MMLU Pro | 90.2% | 80.5% | Gemini 3.8 Flash |
| LegalBench (Vals AI) | 87.0% | 83.1% | Gemini 3.8 Flash |
| CaseLaw (Vals AI) | Not measured | 69.9% | Only GPT-4.1 measured |
| CorpFin (Vals AI) | Not measured | 63.0% | Only GPT-4.1 measured |
| TaxEval (Vals AI) | 74.5% | 75.1% | GPT-4.1 |
| MortgageTax (Vals AI) | 65.3% | 65.9% | GPT-4.1 |
| MedQA (Vals AI) | Not measured | 91.2% | Only GPT-4.1 measured |
| MedCode (Vals AI) | 48.1% | Not measured | Only Gemini 3.8 Flash measured |
| MMLU Pro (Artificial Analysis run) | Not measured | 80.6% | Only GPT-4.1 measured |
| SimpleQA Verified | 69.7% | 31.1% | Gemini 3.8 Flash |
| GeoBench | Not measured | 72.0% | Only GPT-4.1 measured |
| LMArena Text: science | 1523 | 1382 | Gemini 3.8 Flash |
| LMArena Text: medicine and healthcare | 1508 | 1379 | Gemini 3.8 Flash |
| LMArena Text: legal and government | 1497 | 1399 | Gemini 3.8 Flash |
| LMArena Text: business and finance | 1479 | 1369 | Gemini 3.8 Flash |
| FACTS Benchmark Suite | 69.4% | 45.8% | Gemini 3.8 Flash |
| 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 3.8 Flash | GPT-4.1 | Leader |
|---|---|---|---|
| Design Arena: websites | 1300 | 1038 | Gemini 3.8 Flash |
| Design Arena: UI components | 1316 | 997 | Gemini 3.8 Flash |
| Design Arena: game dev | 1304 | 1079 | Gemini 3.8 Flash |
| Design Arena: data viz | 1270 | 1104 | Gemini 3.8 Flash |
| Design Arena: 3D | 1294 | 849 | Gemini 3.8 Flash |
| Design Arena: all code categories | 1303 | 1025 | Gemini 3.8 Flash |
| Design Arena: SVG | 1296 | Not measured | Only Gemini 3.8 Flash measured |
| Design Arena: ASCII art | 1262 | Not measured | Only Gemini 3.8 Flash measured |
| LiveBench design | 72.7% | Not measured | Only Gemini 3.8 Flash measured |
GeneralLike-for-likePublic boards, shown as published, kept out of the index260
| Benchmark | Gemini 3.8 Flash | GPT-4.1 | Leader |
|---|---|---|---|
| Vals Index | 56.0% | Not measured | Only Gemini 3.8 Flash measured |
| LiveBench data analysis | 54.0% | Not measured | Only Gemini 3.8 Flash measured |
| Public Benefits Bench (Vals AI) | 65.3% | Not measured | Only Gemini 3.8 Flash measured |
| SAGE (Vals AI) | 35.1% | Not measured | Only Gemini 3.8 Flash measured |
| MedScribe (Vals AI) | 84.5% | Not measured | Only Gemini 3.8 Flash measured |
| IFBench | Not measured | 43.0% | Only GPT-4.1 measured |
| Long context reasoning (AA-LCR) | 84.0% | 68.3% | Gemini 3.8 Flash |
| DTBench | 95.7% | 68.3% | Gemini 3.8 Flash |
| LMCA | 52.9% | 25.6% | Gemini 3.8 Flash |
| Fiction.LiveBench | Not measured | 63.9% | Only GPT-4.1 measured |
| Surface Evolver Bench | 76.9% | Not measured | Only Gemini 3.8 Flash measured |
| Furniture assembly | 31.7% | Not measured | Only Gemini 3.8 Flash measured |
| LMArena Text | 1499 | 1383 | Gemini 3.8 Flash |
| LMArena Text: instruction following | 1492 | 1367 | Gemini 3.8 Flash |
| LMArena Text: creative writing | 1488 | 1363 | Gemini 3.8 Flash |
| LMArena Vision | 1315 | 1210 | Gemini 3.8 Flash |
| LMArena Text: English | 1498 | 1392 | Gemini 3.8 Flash |
| LMArena Text: non-English | 1491 | 1370 | Gemini 3.8 Flash |
| LMArena Text: Chinese | 1553 | 1382 | Gemini 3.8 Flash |
| LMArena Text: German | 1501 | 1381 | Gemini 3.8 Flash |
| LMArena Text: Japanese | 1507 | 1319 | Gemini 3.8 Flash |
| LMArena Text: Korean | 1464 | 1338 | Gemini 3.8 Flash |
| LMArena Text: French | 1496 | 1382 | Gemini 3.8 Flash |
| LMArena Text: Spanish | 1487 | 1376 | Gemini 3.8 Flash |
| LMArena Text: Russian | 1514 | 1377 | Gemini 3.8 Flash |
| LMArena Text: Polish | 1497 | 1389 | Gemini 3.8 Flash |
| LMArena Text: multi-turn | 1503 | 1397 | Gemini 3.8 Flash |
| LMArena Text: longer queries | 1507 | 1385 | Gemini 3.8 Flash |
| LMArena Text: writing and language | 1494 | 1371 | Gemini 3.8 Flash |
| LMArena Text: entertainment and media | 1480 | 1365 | Gemini 3.8 Flash |
| LMArena Vision: English | 1318 | 1209 | Gemini 3.8 Flash |
| LMArena Vision: Chinese | 1416 | 1226 | Gemini 3.8 Flash |
| LMArena Vision: reading text | 1333 | 1218 | Gemini 3.8 Flash |
| LMArena Vision: humor | 1321 | 1196 | Gemini 3.8 Flash |
| LMArena Vision: captioning | Not measured | 1207 | Only GPT-4.1 measured |
| LMArena Vision: recognizing things | Not measured | 1208 | Only GPT-4.1 measured |
| LMArena Vision: creative writing | 1299 | 1210 | Gemini 3.8 Flash |
| Neither model has a result on the other 9 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Gemini 3.8 Flash | GPT-4.1 | 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 3.8 Flash costs less
Repository review
50K input + 3K output tokens
Gemini 3.8 Flash costs less
Agent loop
200K input + 10K output tokens
Gemini 3.8 Flash 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 3.8 Flash | OpenAI GPT-4.1 |
|---|---|---|
| Maker | OpenAI | |
| Weights | No public weights listed | No public weights listed |
| Released | September 2, 2026 | April 14, 2025 |
| Context window | 1.05M | 1.05M |
| Input $/Mtok | $0.75 | $2.00 |
| Output $/Mtok | $3.75 | $8.00 |
| Coding index | 61.6 | Not benchmarked |
| Independent measurements behind it | 6 | 0 |
| Cost per solved task | $2.74 | $0.37 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Gemini 3.8 Flash better than GPT-4.1 for coding?
Only Gemini 3.8 Flash has a coding score, 61.6 on the Vibe Coding Index; GPT-4.1 has none, so the two cannot be ranked on coding. Pick GPT-4.1 for a lower cost per solved task ($0.37 against $2.74) and work measured by TaxEval (Vals AI) or MortgageTax (Vals AI), where it leads.
Which is cheaper, Gemini 3.8 Flash or GPT-4.1?
Gemini 3.8 Flash costs $0.75 per million input tokens and $3.75 per million output tokens; GPT-4.1 costs $2.00 and $8.00. Per solved SWE-bench Verified task, Gemini 3.8 Flash costs $2.74 and GPT-4.1 $0.37.
Which has the bigger context window, Gemini 3.8 Flash or GPT-4.1?
Gemini 3.8 Flash, with 1.05M tokens against 1.05M.
How many benchmarks is the Gemini 3.8 Flash vs GPT-4.1 comparison based on?
67 benchmarks have a result for both models as of October 22, 2026. Gemini 3.8 Flash's coding index rests on 6 independent benchmarks and GPT-4.1's on 0. Where only one model has a result, the page says so instead of naming a winner.