GPT-6 Astra vs Nemotron 3 Ultra
GPT-6 Astra leads Nemotron 3 Ultra on coding, 85.1 to 30.0 on the Vibe Coding Index, and Nemotron 3 Ultra costs 20.8x less per output token ($2.40 vs $50.00 per million). Updated October 23, 2026; 60 benchmarks have a result for both.
GPT-6 Astra or Nemotron 3 Ultra: which to pick
Pick GPT-6 Astra for coding: it scores 85.1 on the Vibe Coding Index against 30.0 for Nemotron 3 Ultra.
Pick Nemotron 3 Ultra for output tokens 20.8x cheaper ($2.40 vs $50.00 per million) and work measured by LMArena Text: science or LMArena Text: medicine and healthcare, where it leads.
- Shared results
- 60
- GPT-6 Astra only
- 69
- Nemotron 3 Ultra only
- 11
- 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 30.0.
5 and 3 benchmarks behind the scores
Intelligence
AA Intelligence Index
GPT-6 Astra
GPT-6 Astra leads, 52.7 against 22.9.
Same board, both measured
Agentic work
AA Agentic Index
GPT-6 Astra
GPT-6 Astra leads, 51.0 against 20.1.
Same board, both measured
Reasoning
GPQA Diamond
No call
Only Nemotron 3 Ultra has a GPQA Diamond result, 86.1%.
Directional only
Knowledge
MMLU Pro
No call
Only Nemotron 3 Ultra has a MMLU Pro result, 85.8%.
Directional only
Web design
Design Arena: websites
GPT-6 Astra
GPT-6 Astra leads, 1336 against 1145.
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 262K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Nemotron 3 Ultra
GPT-6 Astra $0.035, Nemotron 3 Ultra $0.0018 per turn.
List prices
At a glance
- Coding index
- GPT-6 Astra 85.1 from 5 benchmarks, Nemotron 3 Ultra 30.0 from 3 benchmarks.
- Widest category
- Coding, 34.6 points apart on average over 10 shared benchmarks.
- Widest single gap
- ProofBench: GPT-6 Astra 99.0% against Nemotron 3 Ultra 2.0%, 97.0 points apart on a 0 to 100 scale.
- Output price
- GPT-6 Astra $50.00 against Nemotron 3 Ultra $2.40 per million output tokens, 20.8x apart.
- Context window
- GPT-6 Astra takes 1.05M tokens, Nemotron 3 Ultra 262K.
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 | GPT-6 Astra | Bars | Nemotron 3 Ultra | Ties |
|---|---|---|---|---|
| Coding | 10 | 0 | ||
| Intelligence | 2 | 0 | ||
| Agentic work | 5 | 0 | ||
| Reasoning | 7 | 0 | ||
| Math | 4 | 0 | ||
| Knowledge | 3 | 2 | ||
| Web design | 8 | 0 | ||
| General | 13 | 6 | ||
| All shared boards | 52 | 8 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index100
| Benchmark | GPT-6 Astra | Nemotron 3 Ultra | Leader |
|---|---|---|---|
| LiveBench coding | 93.7% | Not measured | Only GPT-6 Astra measured |
| LMArena WebDev | 1775 | Not measured | Only GPT-6 Astra measured |
| AA Coding Index | 76.9 | 49.3 | GPT-6 Astra |
| LiveCodeBench (Vals AI) | Not measured | 86.0% | Only Nemotron 3 Ultra measured |
| SWE-bench Verified (Vals AI) | Not measured | 69.0% | Only Nemotron 3 Ultra measured |
| Terminal-Bench 4 (Vals AI) | 59.6% | Not measured | Only GPT-6 Astra measured |
| Vibe Code Bench (Vals AI) | 89.6% | 7.6% | GPT-6 Astra |
| Code migration (Vals AI) | 67.7% | 4.9% | GPT-6 Astra |
| ProgramBench (Vals AI) | 5.5% | 0.0% | GPT-6 Astra |
| IOI (Vals AI) | 100.0% | Not measured | Only GPT-6 Astra measured |
| Terminal-Bench 2.1 (Vals AI) | 87.3% | 50.9% | GPT-6 Astra |
| SWE-bench Multimodal (Vals AI) | 43.3% | Not measured | Only GPT-6 Astra measured |
| Vibe Code Bench 1-100 (Vals AI) | 27.6% | Not measured | Only GPT-6 Astra measured |
| CyberBench (Vals AI) | 41.1% | Not measured | Only GPT-6 Astra measured |
| SciCode | 56.5% | 40.3% | GPT-6 Astra |
| Terminal-Bench Hard (Artificial Analysis run) | Not measured | 36.4% | Only Nemotron 3 Ultra measured |
| FrontierCode | 53.3% | 13.6% | GPT-6 Astra |
| FrontierSWE | 65.5% | Not measured | Only GPT-6 Astra measured |
| GSO-Bench | 79.4% | Not measured | Only GPT-6 Astra measured |
| WeirdML | 93.3% | 43.5% | GPT-6 Astra |
| MirrorCode | 46.7% | Not measured | Only GPT-6 Astra measured |
| ALE-Bench | 2951.3 | Not measured | Only GPT-6 Astra measured |
| LMArena Text: coding | 1489 | 1467 | GPT-6 Astra |
| LMArena Text: software and IT | 1475 | 1468 | GPT-6 Astra |
| LMArena WebDev: React | 1796 | Not measured | Only GPT-6 Astra measured |
| LMArena WebDev: HTML | 1778 | Not measured | Only GPT-6 Astra measured |
| LMArena WebDev: from an image | 1726 | Not measured | Only GPT-6 Astra measured |
| SciCode | 12.3% | Not measured | Only GPT-6 Astra measured |
| SWE-Bench Pro V2 | 96.9% | Not measured | Only GPT-6 Astra measured |
| SWE Atlas: Codebase QnA | 59.1% | Not measured | Only GPT-6 Astra measured |
| SWE Atlas: Refactoring | 59.1% | Not measured | Only GPT-6 Astra measured |
| SWE Atlas: Test Writing | 50.7% | Not measured | Only GPT-6 Astra measured |
| Neither model has a result on the other 11 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | GPT-6 Astra | Nemotron 3 Ultra | Leader |
|---|---|---|---|
| AA Intelligence Index | 52.7 | 22.9 | GPT-6 Astra |
| Epoch Capabilities Index | 168.8 | 146.0 | GPT-6 Astra |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index50
| Benchmark | GPT-6 Astra | Nemotron 3 Ultra | Leader |
|---|---|---|---|
| AA Agentic Index | 51.0 | 20.1 | GPT-6 Astra |
| Design Arena: agents building web apps | 1374 | Not measured | Only GPT-6 Astra measured |
| Design Arena: agents building full-stack apps | 1357 | Not measured | Only GPT-6 Astra measured |
| Design Arena: agents building mobile apps | 1309 | Not measured | Only GPT-6 Astra measured |
| Design Arena: agents building Godot games | 1348 | Not measured | Only GPT-6 Astra measured |
| Design Arena: PowerPoint slides | 1377 | Not measured | Only GPT-6 Astra measured |
| Design Arena: spreadsheets | 1378 | Not measured | Only GPT-6 Astra measured |
| LiveBench research | 85.2% | Not measured | Only GPT-6 Astra measured |
| LiveBench browser | 84.0% | Not measured | Only GPT-6 Astra measured |
| LiveBench long agentic | 82.4% | Not measured | Only GPT-6 Astra measured |
| SREBench (Vals AI) | 56.9% | Not measured | Only GPT-6 Astra measured |
| Finance Agent (Vals AI) | 53.5% | 37.7% | GPT-6 Astra |
| Tax Agent Bench (Vals AI) | 20.7% | Not measured | Only GPT-6 Astra measured |
| Legal Research Bench (Vals AI) | 39.4% | 15.4% | GPT-6 Astra |
| Harvey's Legal Agent Benchmark (Vals AI) | 7.1% | Not measured | Only GPT-6 Astra measured |
| Excel Modeling Benchmark (Vals AI) | 71.7% | 31.7% | GPT-6 Astra |
| BioMysteryBench (Vals AI) | 79.3% | Not measured | Only GPT-6 Astra measured |
| Terminal-Bench-Science (Vals AI) | 62.9% | Not measured | Only GPT-6 Astra measured |
| Vals Science Index | 65.1% | Not measured | Only GPT-6 Astra measured |
| Time Horizon Index (Vals AI) | 90.5% | Not measured | Only GPT-6 Astra measured |
| CUA-bench (Vals AI) | 19.2% | Not measured | Only GPT-6 Astra measured |
| Robo-bench (Vals AI) | 23.3% | Not measured | Only GPT-6 Astra measured |
| τ²-Bench Telecom | Not measured | 83.3% | Only Nemotron 3 Ultra measured |
| APEX-Agents | 64.7% | 22.7% | GPT-6 Astra |
| Remote Labor Index | 20.8% | Not measured | Only GPT-6 Astra measured |
| BALROG | 68.3% | Not measured | Only GPT-6 Astra measured |
| SpireClimb | 25.7% | Not measured | Only GPT-6 Astra measured |
| Vending-Bench 2 | $15,515 | Not measured | Only GPT-6 Astra measured |
| MCP Atlas | Not measured | 63.1% | Only Nemotron 3 Ultra measured |
| Neither model has a result on the other 13 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index70
| Benchmark | GPT-6 Astra | Nemotron 3 Ultra | Leader |
|---|---|---|---|
| GPQA Diamond | Not measured | 86.1% | Only Nemotron 3 Ultra measured |
| LiveBench reasoning | 92.7% | Not measured | Only GPT-6 Astra measured |
| MysteryMechanism (Vals AI) | 53.1% | Not measured | Only GPT-6 Astra measured |
| GPQA Diamond (Artificial Analysis run) | 96.3% | 86.7% | GPT-6 Astra |
| Humanity's Last Exam (Artificial Analysis run) | 54.7% | 28.4% | GPT-6 Astra |
| GPQA Diamond (Epoch AI run) | 95.8% | 85.4% | GPT-6 Astra |
| ARC-AGI | 98.5% | Not measured | Only GPT-6 Astra measured |
| ARC-AGI-2 | 95.0% | Not measured | Only GPT-6 Astra measured |
| Chess puzzles | 74.0% | Not measured | Only GPT-6 Astra measured |
| Mystery game puzzles | 84.0% | 20.0% | GPT-6 Astra |
| EBR-bench | 76.2% | Not measured | Only GPT-6 Astra measured |
| LMArena Text: hard prompts | 1463 | 1452 | GPT-6 Astra |
| LMArena Text: expert | 1492 | 1472 | GPT-6 Astra |
| LMArena Text: hard prompts in English | 1465 | 1453 | GPT-6 Astra |
| LMArena Vision: diagrams | 1297 | Not measured | Only GPT-6 Astra measured |
| LMArena Vision: homework | 1337 | Not measured | Only GPT-6 Astra measured |
| Humanity's Last Exam (Scale run) | 60.6% | Not measured | Only GPT-6 Astra measured |
| Neither model has a result on the other 6 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index40
| Benchmark | GPT-6 Astra | Nemotron 3 Ultra | Leader |
|---|---|---|---|
| OTIS Mock AIME | 100.0% | 86.7% | GPT-6 Astra |
| FrontierMath, tiers 1 to 3 | 93.7% | Not measured | Only GPT-6 Astra measured |
| FrontierMath, tier 4 | 97.6% | Not measured | Only GPT-6 Astra measured |
| ProofBench | 99.0% | 2.0% | GPT-6 Astra |
| LMArena Text: math | 1466 | 1457 | GPT-6 Astra |
| LMArena Text: mathematical work | 1482 | 1462 | GPT-6 Astra |
| MathArena | 81.9% | Not measured | Only GPT-6 Astra measured |
| Neither model has a result on the other 7 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index32
| Benchmark | GPT-6 Astra | Nemotron 3 Ultra | Leader |
|---|---|---|---|
| MMLU Pro | Not measured | 85.8% | Only Nemotron 3 Ultra measured |
| LegalBench (Vals AI) | Not measured | 82.1% | Only Nemotron 3 Ultra measured |
| CorpFin (Vals AI) | Not measured | 65.5% | Only Nemotron 3 Ultra measured |
| TaxEval (Vals AI) | Not measured | 73.1% | Only Nemotron 3 Ultra measured |
| MedCode (Vals AI) | 48.5% | 38.6% | GPT-6 Astra |
| SimpleQA Verified | 75.6% | Not measured | Only GPT-6 Astra measured |
| LMArena Text: science | 1451 | 1465 | Nemotron 3 Ultra |
| LMArena Text: medicine and healthcare | 1421 | 1455 | Nemotron 3 Ultra |
| LMArena Text: legal and government | 1461 | 1453 | GPT-6 Astra |
| LMArena Text: business and finance | 1438 | 1435 | GPT-6 Astra |
| FACTS Benchmark Suite | 75.7% | Not measured | Only GPT-6 Astra measured |
| PRBench Finance | 47.5% | Not measured | Only GPT-6 Astra measured |
| PRBench Legal | 48.4% | Not measured | Only GPT-6 Astra measured |
| Neither model has a result on the other 7 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index80
| Benchmark | GPT-6 Astra | Nemotron 3 Ultra | Leader |
|---|---|---|---|
| Design Arena: websites | 1336 | 1145 | GPT-6 Astra |
| Design Arena: UI components | 1394 | 1135 | GPT-6 Astra |
| Design Arena: game dev | 1479 | 1138 | GPT-6 Astra |
| Design Arena: data viz | 1335 | 1142 | GPT-6 Astra |
| Design Arena: 3D | 1501 | 1132 | GPT-6 Astra |
| Design Arena: all code categories | 1381 | 1146 | GPT-6 Astra |
| Design Arena: SVG | 1430 | 1069 | GPT-6 Astra |
| Design Arena: ASCII art | 1353 | 1100 | GPT-6 Astra |
| LiveBench design | 82.0% | Not measured | Only GPT-6 Astra measured |
GeneralLike-for-likePublic boards, shown as published, kept out of the index136
| Benchmark | GPT-6 Astra | Nemotron 3 Ultra | Leader |
|---|---|---|---|
| Vals Index | 65.0% | Not measured | Only GPT-6 Astra measured |
| LiveBench data analysis | 83.0% | Not measured | Only GPT-6 Astra measured |
| SAGE (Vals AI) | 46.4% | Not measured | Only GPT-6 Astra measured |
| MedScribe (Vals AI) | 87.9% | Not measured | Only GPT-6 Astra measured |
| IFBench | Not measured | 81.4% | Only Nemotron 3 Ultra measured |
| Long context reasoning (AA-LCR) | 80.7% | 79.3% | GPT-6 Astra |
| DTBench | 97.3% | 90.1% | GPT-6 Astra |
| LMCA | 64.4% | 36.9% | GPT-6 Astra |
| Furniture assembly | 80.0% | Not measured | Only GPT-6 Astra measured |
| LMArena Text | 1442 | 1445 | Nemotron 3 Ultra |
| LMArena Text: instruction following | 1455 | 1418 | GPT-6 Astra |
| LMArena Text: creative writing | 1421 | 1398 | GPT-6 Astra |
| LMArena Vision | 1280 | Not measured | Only GPT-6 Astra measured |
| LMArena Text: English | 1448 | 1454 | Nemotron 3 Ultra |
| LMArena Text: non-English | 1432 | 1427 | GPT-6 Astra |
| LMArena Text: Chinese | 1489 | 1498 | Nemotron 3 Ultra |
| LMArena Text: German | 1455 | 1474 | Nemotron 3 Ultra |
| LMArena Text: Japanese | 1404 | Not measured | Only GPT-6 Astra measured |
| LMArena Text: Korean | 1427 | 1385 | GPT-6 Astra |
| LMArena Text: French | 1425 | 1473 | Nemotron 3 Ultra |
| LMArena Text: Spanish | 1423 | 1454 | Nemotron 3 Ultra |
| LMArena Text: Russian | 1442 | 1417 | GPT-6 Astra |
| LMArena Text: Polish | 1427 | 1385 | GPT-6 Astra |
| LMArena Text: multi-turn | 1449 | 1411 | GPT-6 Astra |
| LMArena Text: longer queries | 1462 | 1437 | GPT-6 Astra |
| LMArena Text: writing and language | 1440 | 1405 | GPT-6 Astra |
| LMArena Text: entertainment and media | 1428 | 1397 | GPT-6 Astra |
| LMArena Vision: English | 1280 | Not measured | Only GPT-6 Astra measured |
| LMArena Vision: Chinese | 1361 | Not measured | Only GPT-6 Astra measured |
| LMArena Vision: reading text | 1292 | Not measured | Only GPT-6 Astra measured |
| LMArena Vision: creative writing | 1286 | Not measured | Only GPT-6 Astra measured |
| Neither model has a result on the other 17 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | GPT-6 Astra | Nemotron 3 Ultra | 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
Nemotron 3 Ultra costs less
Repository review
50K input + 3K output tokens
Nemotron 3 Ultra costs less
Agent loop
200K input + 10K output tokens
Nemotron 3 Ultra 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 | OpenAI GPT-6 Astra | NVIDIA Nemotron 3 Ultra |
|---|---|---|
| Maker | OpenAI | NVIDIA |
| Weights | No public weights listed | Open weights |
| Released | September 4, 2026 | June 4, 2026 |
| Context window | 1.05M | 262K |
| Input $/Mtok | $10.00 | $0.60 |
| Output $/Mtok | $50.00 | $2.40 |
| Coding index | 85.1 | 30.0 |
| Independent measurements behind it | 5 | 3 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is GPT-6 Astra better than Nemotron 3 Ultra for coding?
Pick GPT-6 Astra for coding: it scores 85.1 on the Vibe Coding Index against 30.0 for Nemotron 3 Ultra. Pick Nemotron 3 Ultra for output tokens 20.8x cheaper ($2.40 vs $50.00 per million) and work measured by LMArena Text: science or LMArena Text: medicine and healthcare, where it leads.
Which is cheaper, GPT-6 Astra or Nemotron 3 Ultra?
GPT-6 Astra costs $10.00 per million input tokens and $50.00 per million output tokens; Nemotron 3 Ultra costs $0.60 and $2.40. Cost per solved task is known for neither of them.
Which has the bigger context window, GPT-6 Astra or Nemotron 3 Ultra?
GPT-6 Astra, with 1.05M tokens against 262K.
How many benchmarks is the GPT-6 Astra vs Nemotron 3 Ultra comparison based on?
60 benchmarks have a result for both models as of October 23, 2026. GPT-6 Astra's coding index rests on 5 independent benchmarks and Nemotron 3 Ultra's on 3. Where only one model has a result, the page says so instead of naming a winner.