Model comparison
Grok 4.5 vs Nemotron 3 Ultra
Grok 4.5 is the stronger model overall, scoring 55.0 to 42.5 on the Noometry Index. Nemotron 3 Ultra costs 3.2× less per token, which makes it the better buy when Grok 4.5's lead doesn't matter for your workload.
Last verified . 29 shared benchmarks.
NVIDIASummary
- They share 29 benchmarks with published results for both. Grok 4.5 scores higher in 8 categories and Nemotron 3 Ultra in 1 category; 6 gaps are clear of the uncertainty.
- The widest gap is in math, where Grok 4.5 leads 60.9 to 35.3.
- The biggest single-benchmark swing is APEX-Agents: 56.2% for Grok 4.5 and 22.7% for Nemotron 3 Ultra.
- Nemotron 3 Ultra is cheaper at $0.50 / $2.20 per million input/output tokens, against $2 / $6 for Grok 4.5.
- Grok 4.5 accepts more context: 500K tokens versus 262K.
- Nemotron 3 Ultra has downloadable open weights; the other is API-only.
Side by side
| Grok 4.5 | Nemotron 3 Ultra | |
|---|---|---|
| Provider | xAI | NVIDIA |
| Noometry Index | 55.0 | 42.5 |
| Released | 2026-07-08 | 2026-06-04 |
| Weights | Proprietary | Open |
| Context window | 500K | 262K |
| Max output | 500K | 128K |
| Input $ / M tokens | $2 | $0.50 |
| Output $ / M tokens | $6 | $2.20 |
| Results tracked | 52 | 30 |
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Category by category
Coding Grok 4.5 leads
Grok 4.5: 52.2 (#35), Nemotron 3 Ultra: 38.1 (#182)
| Benchmark | Grok 4.5 | Nemotron 3 Ultra |
|---|---|---|
| FrontierCode | 42.4% | 13.6% |
| SciCode | 54.1% | 40.3% |
| WeirdML | 46.4% | 43.5% |
| LMArena Coding | 1474 | 1468 |
| DeepSWE | 53.8% | — |
| LMArena WebDev | 1553 | — |
| ALE-Bench | 1,309 | — |
Agentic & Tool Use Grok 4.5 leads
Grok 4.5: 44.4 (#17), Nemotron 3 Ultra: 23.4 (#126)
| Benchmark | Grok 4.5 | Nemotron 3 Ultra |
|---|---|---|
| APEX-Agents | 56.2% | 22.7% |
| τ²-bench Banking | 47.9% | — |
| PostTrainBench | 23.4% | — |
| GBAEval | 65.4% | — |
| GDP.pdf | 14% | — |
| LMArena Search | 1213 | — |
| Vending-Bench 2 | 3,887 | — |
Reasoning Grok 4.5 leads
Grok 4.5: 56.1 (#25), Nemotron 3 Ultra: 31.0 (#82)
| Benchmark | Grok 4.5 | Nemotron 3 Ultra |
|---|---|---|
| CritPt | 15.4% | 3.1% |
| Chess Puzzles | 36% | 12% |
| LMArena Hard Prompts | 1462 | 1452 |
| DTBench | 96.5% | 90.1% |
| LMCA | 45.2% | 36.9% |
| Epoch Capabilities Index | 153.92 | 146.17 |
| ARC-AGI-2 | 52.6% | — |
| SimpleBench | 70% | — |
| Kagi LLM Benchmark | 83.5% | — |
| NYT Connections (extended) | 79.9% | — |
| ARC-AGI-1 | 87.2% | — |
| Mystery Game Puzzles | — | 20% |
| Surface Evolver Bench | 74.4% | — |
Math Grok 4.5 leads
Grok 4.5: 60.9 (#35), Nemotron 3 Ultra: 35.3 (#187)
| Benchmark | Grok 4.5 | Nemotron 3 Ultra |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 97.8% | 86.7% |
| ProofBench | 31% | 2% |
| LMArena Math | 1459 | 1457 |
| FrontierMath (Tiers 1-3) | 57.2% | — |
| FrontierMath Tier 4 | 24.4% | — |
Knowledge Grok 4.5 leads
Grok 4.5: 62.3 (#24), Nemotron 3 Ultra: 52.5 (#61)
| Benchmark | Grok 4.5 | Nemotron 3 Ultra |
|---|---|---|
| GPQA Diamond | 93.4% | 85.4% |
| LMArena Expert | 1466 | 1472 |
| SimpleQA Verified | 48.3% | — |
Multimodal Not comparable
Grok 4.5: 37.6 (#72), Nemotron 3 Ultra: —
| Benchmark | Grok 4.5 | Nemotron 3 Ultra |
|---|---|---|
| LMArena Vision | 1288 | — |
| Blueprint-Bench 2 | 27.3% | — |
| Furniture Assembly | 22.5% | — |
| LMArena Document | 1452 | — |
Multilingual Too close to call
Grok 4.5: 54.4 (#42), Nemotron 3 Ultra: 53.5 (#64)
| Benchmark | Grok 4.5 | Nemotron 3 Ultra |
|---|---|---|
| LMArena Non-English | 1440 | 1427 |
| LMArena Chinese | 1496 | 1497 |
| LMArena French | 1456 | 1472 |
| LMArena German | 1446 | 1471 |
| LMArena Korean | 1404 | 1386 |
| LMArena Russian | 1448 | 1417 |
| LMArena Spanish | 1450 | 1454 |
| LMArena Japanese | 1428 | — |
Instruction Following Grok 4.5 leads
Grok 4.5: 76.0 (#48), Nemotron 3 Ultra: 74.7 (#88)
| Benchmark | Grok 4.5 | Nemotron 3 Ultra |
|---|---|---|
| LMArena Instruction Following | 1446 | 1418 |
Long Context Too close to call
Grok 4.5: 44.8 (#56), Nemotron 3 Ultra: 43.9 (#81)
| Benchmark | Grok 4.5 | Nemotron 3 Ultra |
|---|---|---|
| LMArena Longer Query | 1463 | 1437 |
Writing & Preference Too close to call
Grok 4.5: 65.8 (#42), Nemotron 3 Ultra: 66.3 (#36)
| Benchmark | Grok 4.5 | Nemotron 3 Ultra |
|---|---|---|
| LMArena Text | 1448 | 1445 |
| LMArena Creative Writing | 1442 | 1398 |
| EQ-Bench Creative Writing | 1579 | 1692 |
| LMArena Multi-Turn | 1456 | 1411 |
Frequently asked questions
Is Grok 4.5 better than Nemotron 3 Ultra?
Grok 4.5 is the stronger model overall, scoring 55.0 to 42.5 on the Noometry Index. Nemotron 3 Ultra costs 3.2× less per token, which makes it the better buy when Grok 4.5's lead doesn't matter for your workload.
Which is cheaper, Grok 4.5 or Nemotron 3 Ultra?
Nemotron 3 Ultra is cheaper. It lists at $0.50 per million input tokens and $2.20 per million output tokens; Grok 4.5 lists at $2 and $6.
Is Grok 4.5 or Nemotron 3 Ultra better for coding?
Grok 4.5 scores higher on coding benchmarks: 52.2 versus 38.1 in the Noometry coding category.
Which has the bigger context window?
Grok 4.5 does, with 500K tokens against 262K.
How many benchmarks do Grok 4.5 and Nemotron 3 Ultra share?
29 benchmarks have published results for both models. Grok 4.5 has 52 scored results on Noometry and Nemotron 3 Ultra has 30.