Gemini 3.1 Flash Lite Preview vs GPT-6 Astra
GPT-6 Astra leads Gemini 3.1 Flash Lite Preview on coding, 85.1 to 22.7 on the Vibe Coding Index, and Gemini 3.1 Flash Lite Preview costs 33.3x less per output token ($1.50 vs $50.00 per million). Updated October 22, 2026; 64 benchmarks have a result for both.
Gemini 3.1 Flash Lite Preview or GPT-6 Astra: which to pick
Pick GPT-6 Astra for coding: it scores 85.1 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 33.3x cheaper ($1.50 vs $50.00 per million) and work measured by LMArena Text: medicine and healthcare or SAGE (Vals AI), where it leads.
- Shared results
- 64
- Gemini 3.1 Flash Lite Preview only
- 15
- GPT-6 Astra only
- 57
- 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
GPT-6 Astra
GPT-6 Astra scores 85.1 against 22.7.
3 and 5 benchmarks behind the scores
Intelligence
AA Intelligence Index
GPT-6 Astra
GPT-6 Astra leads, 52.7 against 15.6.
Same board, both measured
Agentic work
AA Agentic Index
GPT-6 Astra
GPT-6 Astra leads, 51.0 against 1.6.
Same board, both measured
Reasoning
GPQA Diamond
No call
Only Gemini 3.1 Flash Lite Preview has a GPQA Diamond result, 81.1%.
Directional only
Math
AIME
No call
Only Gemini 3.1 Flash Lite Preview has a AIME result, 83.3%.
Directional only
Knowledge
MMLU Pro
No call
Only Gemini 3.1 Flash Lite Preview has a MMLU Pro result, 86.2%.
Directional only
Web design
Design Arena: websites
GPT-6 Astra
GPT-6 Astra leads, 1336 against 1082.
Same board, both measured
General
Vals Index
No call
Only GPT-6 Astra has a Vals Index result, 65.0%.
Directional only
Long documents
Listed context window
GPT-6 Astra
GPT-6 Astra takes 1.05M tokens against 1.05M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Gemini 3.1 Flash Lite Preview
Gemini 3.1 Flash Lite Preview $0.0010, GPT-6 Astra $0.035 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Gemini 3.1 Flash Lite Preview has the number, $0.18.
Directional only
At a glance
- Coding index
- Gemini 3.1 Flash Lite Preview 22.7 from 3 benchmarks, GPT-6 Astra 85.1 from 5 benchmarks.
- Widest category
- Coding, 45.3 points apart on average over 13 shared benchmarks.
- Widest single gap
- Vibe Code Bench (Vals AI): Gemini 3.1 Flash Lite Preview 0.0% against GPT-6 Astra 89.6%, 89.6 points apart on a 0 to 100 scale.
- Output price
- Gemini 3.1 Flash Lite Preview $1.50 against GPT-6 Astra $50.00 per million output tokens, 33.3x apart.
- Context window
- Gemini 3.1 Flash Lite Preview takes 1.05M tokens, GPT-6 Astra 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 3.1 Flash Lite Preview | Bars | GPT-6 Astra | Ties |
|---|---|---|---|---|
| Coding | 0 | 13 | ||
| Intelligence | 0 | 1 | ||
| Agentic work | 0 | 5 | ||
| Reasoning | 0 | 5 | ||
| Math | 0 | 2 | ||
| Knowledge | 1 | 5 | ||
| Web design | 0 | 8 | ||
| General | 3 | 21 | ||
| All shared boards | 4 | 60 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index013
| Benchmark | Gemini 3.1 Flash Lite Preview | GPT-6 Astra | Leader |
|---|---|---|---|
| LiveBench coding | Not measured | 93.7% | Only GPT-6 Astra measured |
| LMArena WebDev | 1257 | 1774 | GPT-6 Astra |
| AA Coding Index | 34.7 | 76.9 | GPT-6 Astra |
| LiveCodeBench (Vals AI) | 80.1% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| SWE-bench Verified (Vals AI) | 62.8% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| Terminal-Bench 4 (Vals AI) | Not measured | 59.6% | Only GPT-6 Astra measured |
| Vibe Code Bench (Vals AI) | 0.0% | 89.6% | GPT-6 Astra |
| Code migration (Vals AI) | 4.6% | 67.7% | GPT-6 Astra |
| ProgramBench (Vals AI) | 0.0% | 5.5% | GPT-6 Astra |
| IOI (Vals AI) | Not measured | 100.0% | Only GPT-6 Astra measured |
| Terminal-Bench 2.1 (Vals AI) | 34.1% | 87.3% | GPT-6 Astra |
| SWE-bench Multimodal (Vals AI) | Not measured | 43.3% | Only GPT-6 Astra measured |
| Vibe Code Bench 1-100 (Vals AI) | Not measured | 27.6% | Only GPT-6 Astra measured |
| CyberBench (Vals AI) | Not measured | 41.1% | Only GPT-6 Astra measured |
| SciCode | Not measured | 56.5% | Only GPT-6 Astra measured |
| FrontierCode | Not measured | 53.3% | Only GPT-6 Astra measured |
| FrontierSWE | Not measured | 65.5% | Only GPT-6 Astra measured |
| GSO-Bench | Not measured | 79.4% | Only GPT-6 Astra measured |
| WeirdML | Not measured | 93.3% | Only GPT-6 Astra measured |
| MirrorCode | Not measured | 46.7% | Only GPT-6 Astra measured |
| ALE-Bench | 797.7 | 2951.3 | GPT-6 Astra |
| LMArena Text: coding | 1400 | 1489 | GPT-6 Astra |
| LMArena Text: software and IT | 1413 | 1474 | GPT-6 Astra |
| LMArena WebDev: React | 1245 | 1798 | GPT-6 Astra |
| LMArena WebDev: HTML | 1276 | 1775 | GPT-6 Astra |
| LMArena WebDev: from an image | 1336 | 1726 | GPT-6 Astra |
| SciCode | 4.6% | 12.3% | GPT-6 Astra |
| Neither model has a result on the other 12 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | Gemini 3.1 Flash Lite Preview | GPT-6 Astra | Leader |
|---|---|---|---|
| AA Intelligence Index | 15.6 | 52.7 | GPT-6 Astra |
| Epoch Capabilities Index | Not measured | 168.8 | Only GPT-6 Astra measured |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index05
| Benchmark | Gemini 3.1 Flash Lite Preview | GPT-6 Astra | Leader |
|---|---|---|---|
| AA Agentic Index | 1.6 | 51.0 | GPT-6 Astra |
| Design Arena: agents building web apps | Not measured | 1373 | Only GPT-6 Astra measured |
| Design Arena: agents building full-stack apps | Not measured | 1357 | Only GPT-6 Astra measured |
| Design Arena: agents building mobile apps | Not measured | 1312 | Only GPT-6 Astra measured |
| Design Arena: agents building Godot games | Not measured | 1348 | Only GPT-6 Astra measured |
| Design Arena: PowerPoint slides | Not measured | 1219 | Only GPT-6 Astra measured |
| Design Arena: spreadsheets | Not measured | 1365 | Only GPT-6 Astra measured |
| LiveBench research | Not measured | 85.2% | Only GPT-6 Astra measured |
| LiveBench browser | Not measured | 84.0% | Only GPT-6 Astra measured |
| LiveBench long agentic | Not measured | 82.4% | Only GPT-6 Astra measured |
| SREBench (Vals AI) | Not measured | 56.9% | Only GPT-6 Astra measured |
| Finance Agent (Vals AI) | 30.0% | 53.5% | GPT-6 Astra |
| Tax Agent Bench (Vals AI) | 3.1% | 20.7% | GPT-6 Astra |
| Legal Research Bench (Vals AI) | 3.4% | 39.4% | GPT-6 Astra |
| Harvey's Legal Agent Benchmark (Vals AI) | Not measured | 7.1% | Only GPT-6 Astra measured |
| Excel Modeling Benchmark (Vals AI) | 8.6% | 71.7% | GPT-6 Astra |
| BioMysteryBench (Vals AI) | Not measured | 79.3% | Only GPT-6 Astra measured |
| Terminal-Bench-Science (Vals AI) | Not measured | 62.9% | Only GPT-6 Astra measured |
| Vals Science Index | Not measured | 65.1% | Only GPT-6 Astra measured |
| Time Horizon Index (Vals AI) | Not measured | 90.5% | Only GPT-6 Astra measured |
| CUA-bench (Vals AI) | Not measured | 19.2% | Only GPT-6 Astra measured |
| Robo-bench (Vals AI) | Not measured | 23.3% | Only GPT-6 Astra measured |
| APEX-Agents | Not measured | 64.7% | Only GPT-6 Astra measured |
| Remote Labor Index | Not measured | 20.8% | Only GPT-6 Astra measured |
| BALROG | Not measured | 68.3% | Only GPT-6 Astra measured |
| SpireClimb | Not measured | 25.7% | Only GPT-6 Astra measured |
| Vending-Bench 2 | Not measured | $15,515 | Only GPT-6 Astra measured |
| Neither model has a result on the other 14 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index05
| Benchmark | Gemini 3.1 Flash Lite Preview | GPT-6 Astra | Leader |
|---|---|---|---|
| GPQA Diamond | 81.1% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| LiveBench reasoning | Not measured | 92.7% | Only GPT-6 Astra measured |
| MysteryMechanism (Vals AI) | Not measured | 53.1% | Only GPT-6 Astra measured |
| MMMU Pro (Vals AI) | 82.5% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| GPQA Diamond (Artificial Analysis run) | Not measured | 96.3% | Only GPT-6 Astra measured |
| Humanity's Last Exam (Artificial Analysis run) | Not measured | 54.7% | Only GPT-6 Astra measured |
| GPQA Diamond (Epoch AI run) | Not measured | 95.8% | Only GPT-6 Astra measured |
| ARC-AGI | Not measured | 98.5% | Only GPT-6 Astra measured |
| ARC-AGI-2 | Not measured | 95.0% | Only GPT-6 Astra measured |
| Chess puzzles | Not measured | 74.0% | Only GPT-6 Astra measured |
| Mystery game puzzles | Not measured | 84.0% | Only GPT-6 Astra measured |
| EBR-bench | Not measured | 76.2% | Only GPT-6 Astra measured |
| LMArena Text: hard prompts | 1407 | 1463 | GPT-6 Astra |
| LMArena Text: expert | 1398 | 1489 | GPT-6 Astra |
| LMArena Text: hard prompts in English | 1403 | 1464 | GPT-6 Astra |
| LMArena Vision: diagrams | 1242 | 1297 | GPT-6 Astra |
| LMArena Vision: homework | 1271 | 1337 | GPT-6 Astra |
| Neither model has a result on the other 5 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index02
| Benchmark | Gemini 3.1 Flash Lite Preview | GPT-6 Astra | Leader |
|---|---|---|---|
| AIME | 83.3% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| OTIS Mock AIME | Not measured | 100.0% | Only GPT-6 Astra measured |
| FrontierMath, tiers 1 to 3 | Not measured | 93.7% | Only GPT-6 Astra measured |
| FrontierMath, tier 4 | Not measured | 97.6% | Only GPT-6 Astra measured |
| ProofBench | Not measured | 99.0% | Only GPT-6 Astra measured |
| LMArena Text: math | 1428 | 1465 | GPT-6 Astra |
| LMArena Text: mathematical work | 1417 | 1484 | GPT-6 Astra |
| Neither model has a result on the other 6 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index15
| Benchmark | Gemini 3.1 Flash Lite Preview | GPT-6 Astra | Leader |
|---|---|---|---|
| MMLU Pro | 86.2% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| LegalBench (Vals AI) | 83.8% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| CaseLaw (Vals AI) | 55.0% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| CorpFin (Vals AI) | 59.4% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| TaxEval (Vals AI) | 71.8% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| MortgageTax (Vals AI) | 68.0% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| MedCode (Vals AI) | 47.6% | 48.5% | GPT-6 Astra |
| SimpleQA Verified | Not measured | 75.6% | Only GPT-6 Astra measured |
| LMArena Text: science | 1425 | 1451 | GPT-6 Astra |
| LMArena Text: medicine and healthcare | 1428 | 1425 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: legal and government | 1418 | 1462 | GPT-6 Astra |
| LMArena Text: business and finance | 1389 | 1439 | GPT-6 Astra |
| FACTS Benchmark Suite | 51.4% | 75.7% | GPT-6 Astra |
| Neither model has a result on the other 5 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index08
| Benchmark | Gemini 3.1 Flash Lite Preview | GPT-6 Astra | Leader |
|---|---|---|---|
| Design Arena: websites | 1082 | 1336 | GPT-6 Astra |
| Design Arena: UI components | 1069 | 1393 | GPT-6 Astra |
| Design Arena: game dev | 1029 | 1478 | GPT-6 Astra |
| Design Arena: data viz | 1045 | 1335 | GPT-6 Astra |
| Design Arena: 3D | 1047 | 1500 | GPT-6 Astra |
| Design Arena: all code categories | 1072 | 1379 | GPT-6 Astra |
| Design Arena: SVG | 1052 | 1431 | GPT-6 Astra |
| Design Arena: ASCII art | 1167 | 1353 | GPT-6 Astra |
| LiveBench design | Not measured | 82.0% | Only GPT-6 Astra measured |
GeneralLike-for-likePublic boards, shown as published, kept out of the index321
| Benchmark | Gemini 3.1 Flash Lite Preview | GPT-6 Astra | Leader |
|---|---|---|---|
| Vals Index | Not measured | 65.0% | Only GPT-6 Astra measured |
| LiveBench data analysis | Not measured | 83.0% | Only GPT-6 Astra measured |
| SAGE (Vals AI) | 49.5% | 46.4% | Gemini 3.1 Flash Lite Preview |
| MedScribe (Vals AI) | 63.9% | 87.9% | GPT-6 Astra |
| Vals Multimodal Index | 41.4% | Not measured | Only Gemini 3.1 Flash Lite Preview measured |
| Long context reasoning (AA-LCR) | Not measured | 80.7% | Only GPT-6 Astra measured |
| DTBench | Not measured | 97.3% | Only GPT-6 Astra measured |
| LMCA | Not measured | 64.4% | Only GPT-6 Astra measured |
| Furniture assembly | Not measured | 80.0% | Only GPT-6 Astra measured |
| LMArena Text | 1416 | 1441 | GPT-6 Astra |
| LMArena Text: instruction following | 1377 | 1455 | GPT-6 Astra |
| LMArena Text: creative writing | 1401 | 1420 | GPT-6 Astra |
| LMArena Vision | 1240 | 1280 | GPT-6 Astra |
| LMArena Text: English | 1414 | 1447 | GPT-6 Astra |
| LMArena Text: non-English | 1410 | 1432 | GPT-6 Astra |
| LMArena Text: Chinese | 1460 | 1489 | GPT-6 Astra |
| LMArena Text: German | 1430 | 1459 | GPT-6 Astra |
| LMArena Text: Japanese | 1413 | 1405 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: Korean | 1392 | 1428 | GPT-6 Astra |
| LMArena Text: French | 1424 | 1432 | GPT-6 Astra |
| LMArena Text: Spanish | 1421 | 1422 | GPT-6 Astra |
| LMArena Text: Russian | 1420 | 1438 | GPT-6 Astra |
| LMArena Text: Polish | 1443 | 1422 | Gemini 3.1 Flash Lite Preview |
| LMArena Text: multi-turn | 1417 | 1447 | GPT-6 Astra |
| LMArena Text: longer queries | 1394 | 1460 | GPT-6 Astra |
| LMArena Text: writing and language | 1408 | 1437 | GPT-6 Astra |
| LMArena Text: entertainment and media | 1386 | 1427 | GPT-6 Astra |
| LMArena Vision: English | 1232 | 1280 | GPT-6 Astra |
| LMArena Vision: Chinese | 1278 | 1361 | GPT-6 Astra |
| LMArena Vision: reading text | 1246 | 1292 | GPT-6 Astra |
| 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 | 1286 | GPT-6 Astra |
| Neither model has a result on the other 12 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-6 Astra | 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 GPT-6 Astra |
|---|---|---|
| Maker | OpenAI | |
| Weights | No public weights listed | No public weights listed |
| Released | March 3, 2026 | September 4, 2026 |
| Context window | 1.05M | 1.05M |
| Input $/Mtok | $0.25 | $10.00 |
| Output $/Mtok | $1.50 | $50.00 |
| Coding index | 22.7 | 85.1 |
| Independent measurements behind it | 3 | 5 |
| Cost per solved task | $0.18 | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Gemini 3.1 Flash Lite Preview better than GPT-6 Astra for coding?
Pick GPT-6 Astra for coding: it scores 85.1 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 33.3x cheaper ($1.50 vs $50.00 per million) and work measured by LMArena Text: medicine and healthcare or SAGE (Vals AI), where it leads.
Which is cheaper, Gemini 3.1 Flash Lite Preview or GPT-6 Astra?
Gemini 3.1 Flash Lite Preview costs $0.25 per million input tokens and $1.50 per million output tokens; GPT-6 Astra costs $10.00 and $50.00. Cost per solved task is known for Gemini 3.1 Flash Lite Preview only.
Which has the bigger context window, Gemini 3.1 Flash Lite Preview or GPT-6 Astra?
GPT-6 Astra, with 1.05M tokens against 1.05M.
How many benchmarks is the Gemini 3.1 Flash Lite Preview vs GPT-6 Astra comparison based on?
64 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 GPT-6 Astra's on 5. Where only one model has a result, the page says so instead of naming a winner.