Gemma 4 31B vs GPT-6 Astra
GPT-6 Astra leads Gemma 4 31B on coding, 85.1 to 39.0 on the Vibe Coding Index, and Gemma 4 31B costs 125.0x less per output token ($0.40 vs $50.00 per million). Updated October 22, 2026; 60 benchmarks have a result for both.
Gemma 4 31B or GPT-6 Astra: which to pick
Pick GPT-6 Astra for coding: it scores 85.1 on the Vibe Coding Index against 39.0 for Gemma 4 31B.
Pick Gemma 4 31B for output tokens 125.0x cheaper ($0.40 vs $50.00 per million) and work measured by LMArena Text: science or LMArena Text: medicine and healthcare, where it leads.
- Shared results
- 60
- Gemma 4 31B only
- 11
- GPT-6 Astra only
- 61
- 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 39.0.
2 and 5 benchmarks behind the scores
Intelligence
AA Intelligence Index
GPT-6 Astra
GPT-6 Astra leads, 52.7 against 14.7.
Same board, both measured
Agentic work
AA Agentic Index
GPT-6 Astra
GPT-6 Astra leads, 51.0 against 4.2.
Same board, both measured
Web design
Design Arena: websites
No call
Only GPT-6 Astra has a Design Arena: websites result, 1336.
Directional only
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 262K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Gemma 4 31B
Gemma 4 31B $0.0003, GPT-6 Astra $0.035 per turn.
List prices
At a glance
- Coding index
- Gemma 4 31B 39.0 from 2 benchmarks, GPT-6 Astra 85.1 from 5 benchmarks.
- Widest category
- Agentic work, 59.2 points apart on average over 4 shared benchmarks.
- Widest single gap
- LiveBench browser: Gemma 4 31B 4.0% against GPT-6 Astra 84.0%, 80.0 points apart on a 0 to 100 scale.
- Output price
- Gemma 4 31B $0.40 against GPT-6 Astra $50.00 per million output tokens, 125.0x apart.
- Context window
- Gemma 4 31B takes 262K 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 | Gemma 4 31B | Bars | GPT-6 Astra | Ties |
|---|---|---|---|---|
| Coding | 0 | 11 | ||
| Intelligence | 0 | 2 | ||
| Agentic work | 0 | 4 | ||
| Reasoning | 0 | 9 | ||
| Math | 0 | 3 | ||
| Knowledge | 2 | 4 | ||
| Web design | 0 | 1 | ||
| General | 8 | 16 | ||
| All shared boards | 10 | 50 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index011
| Benchmark | Gemma 4 31B | GPT-6 Astra | Leader |
|---|---|---|---|
| LiveBench coding | 49.0% | 93.7% | GPT-6 Astra |
| LMArena WebDev | 1367 | 1774 | GPT-6 Astra |
| AA Coding Index | 43.4 | 76.9 | GPT-6 Astra |
| Terminal-Bench 4 (Vals AI) | Not measured | 59.6% | Only GPT-6 Astra measured |
| Vibe Code Bench (Vals AI) | Not measured | 89.6% | Only GPT-6 Astra measured |
| Code migration (Vals AI) | Not measured | 67.7% | Only GPT-6 Astra measured |
| ProgramBench (Vals AI) | Not measured | 5.5% | Only GPT-6 Astra measured |
| IOI (Vals AI) | Not measured | 100.0% | Only GPT-6 Astra measured |
| Terminal-Bench 2.1 (Vals AI) | Not measured | 87.3% | Only GPT-6 Astra measured |
| 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 | 45.5% | 56.5% | GPT-6 Astra |
| Terminal-Bench Hard (Artificial Analysis run) | 36.4% | Not measured | Only Gemma 4 31B 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 | 52.3% | 93.3% | GPT-6 Astra |
| MirrorCode | Not measured | 46.7% | Only GPT-6 Astra measured |
| ALE-Bench | 925.5 | 2951.3 | GPT-6 Astra |
| LMArena Text: coding | 1459 | 1489 | GPT-6 Astra |
| LMArena Text: software and IT | 1463 | 1474 | GPT-6 Astra |
| LMArena WebDev: React | 1359 | 1798 | GPT-6 Astra |
| LMArena WebDev: HTML | 1380 | 1775 | GPT-6 Astra |
| LMArena WebDev: from an image | Not measured | 1726 | Only GPT-6 Astra measured |
| SciCode | 8.9% | 12.3% | GPT-6 Astra |
| Neither model has a result on the other 13 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
| Benchmark | Gemma 4 31B | GPT-6 Astra | Leader |
|---|---|---|---|
| AA Intelligence Index | 14.7 | 52.7 | GPT-6 Astra |
| Epoch Capabilities Index | 143.0 | 168.8 | GPT-6 Astra |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index04
| Benchmark | Gemma 4 31B | GPT-6 Astra | Leader |
|---|---|---|---|
| AA Agentic Index | 4.2 | 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 | 44.4% | 85.2% | GPT-6 Astra |
| LiveBench browser | 4.0% | 84.0% | GPT-6 Astra |
| LiveBench long agentic | 13.3% | 82.4% | GPT-6 Astra |
| SREBench (Vals AI) | Not measured | 56.9% | Only GPT-6 Astra measured |
| Finance Agent (Vals AI) | Not measured | 53.5% | Only GPT-6 Astra measured |
| Tax Agent Bench (Vals AI) | Not measured | 20.7% | Only GPT-6 Astra measured |
| Legal Research Bench (Vals AI) | Not measured | 39.4% | Only GPT-6 Astra measured |
| Harvey's Legal Agent Benchmark (Vals AI) | Not measured | 7.1% | Only GPT-6 Astra measured |
| Excel Modeling Benchmark (Vals AI) | Not measured | 71.7% | Only GPT-6 Astra measured |
| 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 |
| τ²-Bench Telecom | 65.5% | Not measured | Only Gemma 4 31B 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 13 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index09
| Benchmark | Gemma 4 31B | GPT-6 Astra | Leader |
|---|---|---|---|
| LiveBench reasoning | 68.3% | 92.7% | GPT-6 Astra |
| MysteryMechanism (Vals AI) | Not measured | 53.1% | Only GPT-6 Astra measured |
| GPQA Diamond (Artificial Analysis run) | 85.7% | 96.3% | GPT-6 Astra |
| Humanity's Last Exam (Artificial Analysis run) | 23.6% | 54.7% | GPT-6 Astra |
| GPQA Diamond (Epoch AI run) | 75.8% | 95.8% | GPT-6 Astra |
| 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 | 1448 | 1463 | GPT-6 Astra |
| LMArena Text: expert | 1464 | 1489 | GPT-6 Astra |
| LMArena Text: hard prompts in English | 1456 | 1464 | GPT-6 Astra |
| LMArena Vision: diagrams | 1283 | 1297 | GPT-6 Astra |
| LMArena Vision: homework | 1310 | 1337 | GPT-6 Astra |
| Kagi LLM Benchmark | 63.5% | Not measured | Only Gemma 4 31B measured |
| Neither model has a result on the other 6 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index03
| Benchmark | Gemma 4 31B | GPT-6 Astra | Leader |
|---|---|---|---|
| OTIS Mock AIME | 73.3% | 100.0% | GPT-6 Astra |
| 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 | 1463 | 1465 | GPT-6 Astra |
| LMArena Text: mathematical work | 1465 | 1484 | GPT-6 Astra |
| Neither model has a result on the other 7 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index24
| Benchmark | Gemma 4 31B | GPT-6 Astra | Leader |
|---|---|---|---|
| CaseLaw (Vals AI) | 52.6% | Not measured | Only Gemma 4 31B measured |
| MortgageTax (Vals AI) | 61.4% | Not measured | Only Gemma 4 31B measured |
| MedCode (Vals AI) | Not measured | 48.5% | Only GPT-6 Astra measured |
| SimpleQA Verified | 10.4% | 75.6% | GPT-6 Astra |
| LMArena Text: science | 1457 | 1451 | Gemma 4 31B |
| LMArena Text: medicine and healthcare | 1451 | 1425 | Gemma 4 31B |
| LMArena Text: legal and government | 1438 | 1462 | GPT-6 Astra |
| LMArena Text: business and finance | 1430 | 1439 | GPT-6 Astra |
| FACTS Benchmark Suite | 45.3% | 75.7% | GPT-6 Astra |
| Neither model has a result on the other 9 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | Gemma 4 31B | GPT-6 Astra | Leader |
|---|---|---|---|
| Design Arena: websites | Not measured | 1336 | Only GPT-6 Astra measured |
| Design Arena: UI components | Not measured | 1393 | Only GPT-6 Astra measured |
| Design Arena: game dev | Not measured | 1478 | Only GPT-6 Astra measured |
| Design Arena: data viz | Not measured | 1335 | Only GPT-6 Astra measured |
| Design Arena: 3D | Not measured | 1500 | Only GPT-6 Astra measured |
| Design Arena: all code categories | Not measured | 1379 | Only GPT-6 Astra measured |
| Design Arena: SVG | Not measured | 1431 | Only GPT-6 Astra measured |
| Design Arena: ASCII art | Not measured | 1353 | Only GPT-6 Astra measured |
| LiveBench design | 58.4% | 82.0% | GPT-6 Astra |
GeneralLike-for-likePublic boards, shown as published, kept out of the index816
| Benchmark | Gemma 4 31B | GPT-6 Astra | Leader |
|---|---|---|---|
| Vals Index | Not measured | 65.0% | Only GPT-6 Astra measured |
| LiveBench data analysis | 53.3% | 83.0% | GPT-6 Astra |
| SAGE (Vals AI) | 55.0% | 46.4% | Gemma 4 31B |
| MedScribe (Vals AI) | Not measured | 87.9% | Only GPT-6 Astra measured |
| IFBench | 75.6% | Not measured | Only Gemma 4 31B measured |
| Long context reasoning (AA-LCR) | 69.7% | 80.7% | GPT-6 Astra |
| DTBench | 82.7% | 97.3% | GPT-6 Astra |
| LMCA | 39.3% | 64.4% | GPT-6 Astra |
| Surface Evolver Bench | 30.6% | Not measured | Only Gemma 4 31B measured |
| Furniture assembly | Not measured | 80.0% | Only GPT-6 Astra measured |
| LMArena Text | 1443 | 1441 | Gemma 4 31B |
| LMArena Text: instruction following | 1433 | 1455 | GPT-6 Astra |
| LMArena Text: creative writing | 1417 | 1420 | GPT-6 Astra |
| LMArena Vision | 1276 | 1280 | GPT-6 Astra |
| LMArena Text: English | 1451 | 1447 | Gemma 4 31B |
| LMArena Text: non-English | 1430 | 1432 | GPT-6 Astra |
| LMArena Text: Chinese | 1475 | 1489 | GPT-6 Astra |
| LMArena Text: German | Not measured | 1459 | Only GPT-6 Astra measured |
| LMArena Text: Japanese | Not measured | 1405 | Only GPT-6 Astra measured |
| LMArena Text: Korean | Not measured | 1428 | Only GPT-6 Astra measured |
| LMArena Text: French | 1436 | 1432 | Gemma 4 31B |
| LMArena Text: Spanish | 1442 | 1422 | Gemma 4 31B |
| LMArena Text: Russian | 1460 | 1438 | Gemma 4 31B |
| LMArena Text: Polish | 1433 | 1422 | Gemma 4 31B |
| LMArena Text: multi-turn | 1452 | 1447 | Gemma 4 31B |
| LMArena Text: longer queries | 1446 | 1460 | GPT-6 Astra |
| LMArena Text: writing and language | 1432 | 1437 | GPT-6 Astra |
| LMArena Text: entertainment and media | 1405 | 1427 | GPT-6 Astra |
| LMArena Vision: English | 1271 | 1280 | GPT-6 Astra |
| LMArena Vision: Chinese | 1326 | 1361 | GPT-6 Astra |
| LMArena Vision: reading text | 1282 | 1292 | GPT-6 Astra |
| LMArena Vision: humor | 1280 | Not measured | Only Gemma 4 31B measured |
| LMArena Vision: captioning | 1218 | Not measured | Only Gemma 4 31B measured |
| LMArena Vision: recognizing things | 1226 | Not measured | Only Gemma 4 31B measured |
| LMArena Vision: creative writing | 1285 | 1286 | GPT-6 Astra |
| LMArena Document | 1425 | Not measured | Only Gemma 4 31B measured |
| Neither model has a result on the other 10 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Gemma 4 31B | 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
Gemma 4 31B costs less
Repository review
50K input + 3K output tokens
Gemma 4 31B costs less
Agent loop
200K input + 10K output tokens
Gemma 4 31B 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 Gemma 4 31B | OpenAI GPT-6 Astra |
|---|---|---|
| Maker | OpenAI | |
| Weights | Open weights | No public weights listed |
| Released | April 2, 2026 | September 4, 2026 |
| Context window | 262K | 1.05M |
| Input $/Mtok | $0.14 | $10.00 |
| Output $/Mtok | $0.40 | $50.00 |
| Coding index | 39.0 | 85.1 |
| Independent measurements behind it | 2 | 5 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Gemma 4 31B better than GPT-6 Astra for coding?
Pick GPT-6 Astra for coding: it scores 85.1 on the Vibe Coding Index against 39.0 for Gemma 4 31B. Pick Gemma 4 31B for output tokens 125.0x cheaper ($0.40 vs $50.00 per million) and work measured by LMArena Text: science or LMArena Text: medicine and healthcare, where it leads.
Which is cheaper, Gemma 4 31B or GPT-6 Astra?
Gemma 4 31B costs $0.14 per million input tokens and $0.40 per million output tokens; GPT-6 Astra costs $10.00 and $50.00. Cost per solved task is known for neither of them.
Which has the bigger context window, Gemma 4 31B or GPT-6 Astra?
GPT-6 Astra, with 1.05M tokens against 262K.
How many benchmarks is the Gemma 4 31B vs GPT-6 Astra comparison based on?
60 benchmarks have a result for both models as of October 22, 2026. Gemma 4 31B's coding index rests on 2 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.