Model comparison
Grok 4.5 vs Llama 3.1 Nemotron 51b Instruct
Grok 4.5 is the stronger model overall, scoring 55.0 to 35.9 on the Noometry Index.
Last verified . 12 shared benchmarks.
NVIDIASummary
- They share 12 benchmarks with published results for both. Grok 4.5 scores higher in 8 categories and Llama 3.1 Nemotron 51b Instruct in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.5 leads 56.1 to 23.5.
- Llama 3.1 Nemotron 51b Instruct has downloadable open weights; the other is API-only.
Side by side
| Grok 4.5 | Llama 3.1 Nemotron 51b Instruct | |
|---|---|---|
| Provider | xAI | NVIDIA |
| Noometry Index | 55.0 | 35.9 |
| Released | 2026-07-08 | — |
| Weights | Proprietary | Open |
| Context window | 500K | — |
| Max output | 500K | — |
| Input $ / M tokens | $2 | — |
| Output $ / M tokens | $6 | — |
| Results tracked | 52 | 12 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Grok 4.5 leads
Grok 4.5: 52.2 (#35), Llama 3.1 Nemotron 51b Instruct: 35.6 (#222)
| Benchmark | Grok 4.5 | Llama 3.1 Nemotron 51b Instruct |
|---|---|---|
| LMArena Coding | 1474 | 1223 |
| DeepSWE | 53.8% | — |
| FrontierCode | 42.4% | — |
| LMArena WebDev | 1553 | — |
| SciCode | 54.1% | — |
| WeirdML | 46.4% | — |
| ALE-Bench | 1,309 | — |
Agentic & Tool Use Not comparable
Grok 4.5: 44.4 (#17), Llama 3.1 Nemotron 51b Instruct: —
| Benchmark | Grok 4.5 | Llama 3.1 Nemotron 51b Instruct |
|---|---|---|
| APEX-Agents | 56.2% | — |
| 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), Llama 3.1 Nemotron 51b Instruct: 23.5 (#177)
| Benchmark | Grok 4.5 | Llama 3.1 Nemotron 51b Instruct |
|---|---|---|
| LMArena Hard Prompts | 1462 | 1203 |
| ARC-AGI-2 | 52.6% | — |
| SimpleBench | 70% | — |
| Kagi LLM Benchmark | 83.5% | — |
| NYT Connections (extended) | 79.9% | — |
| ARC-AGI-1 | 87.2% | — |
| CritPt | 15.4% | — |
| Chess Puzzles | 36% | — |
| DTBench | 96.5% | — |
| LMCA | 45.2% | — |
| Surface Evolver Bench | 74.4% | — |
| Epoch Capabilities Index | 153.92 | — |
Math Grok 4.5 leads
Grok 4.5: 60.9 (#35), Llama 3.1 Nemotron 51b Instruct: 34.6 (#193)
| Benchmark | Grok 4.5 | Llama 3.1 Nemotron 51b Instruct |
|---|---|---|
| LMArena Math | 1459 | 1230 |
| FrontierMath (Tiers 1-3) | 57.2% | — |
| FrontierMath Tier 4 | 24.4% | — |
| OTIS Mock AIME 2024-2025 | 97.8% | — |
| ProofBench | 31% | — |
Knowledge Grok 4.5 leads
Grok 4.5: 62.3 (#24), Llama 3.1 Nemotron 51b Instruct: 31.9 (#218)
| Benchmark | Grok 4.5 | Llama 3.1 Nemotron 51b Instruct |
|---|---|---|
| LMArena Expert | 1466 | 1167 |
| GPQA Diamond | 93.4% | — |
| SimpleQA Verified | 48.3% | — |
Multimodal Not comparable
Grok 4.5: 37.6 (#72), Llama 3.1 Nemotron 51b Instruct: —
| Benchmark | Grok 4.5 | Llama 3.1 Nemotron 51b Instruct |
|---|---|---|
| LMArena Vision | 1288 | — |
| Blueprint-Bench 2 | 27.3% | — |
| Furniture Assembly | 22.5% | — |
| LMArena Document | 1452 | — |
Multilingual Grok 4.5 leads
Grok 4.5: 54.4 (#42), Llama 3.1 Nemotron 51b Instruct: 36.1 (#241)
| Benchmark | Grok 4.5 | Llama 3.1 Nemotron 51b Instruct |
|---|---|---|
| LMArena Non-English | 1440 | 1181 |
| LMArena Chinese | 1496 | 1180 |
| LMArena Russian | 1448 | 1187 |
| LMArena French | 1456 | — |
| LMArena German | 1446 | — |
| LMArena Japanese | 1428 | — |
| LMArena Korean | 1404 | — |
| LMArena Spanish | 1450 | — |
Instruction Following Grok 4.5 leads
Grok 4.5: 76.0 (#48), Llama 3.1 Nemotron 51b Instruct: 62.9 (#233)
| Benchmark | Grok 4.5 | Llama 3.1 Nemotron 51b Instruct |
|---|---|---|
| LMArena Instruction Following | 1446 | 1201 |
Long Context Grok 4.5 leads
Grok 4.5: 44.8 (#56), Llama 3.1 Nemotron 51b Instruct: 36.5 (#230)
| Benchmark | Grok 4.5 | Llama 3.1 Nemotron 51b Instruct |
|---|---|---|
| LMArena Longer Query | 1463 | 1205 |
Writing & Preference Grok 4.5 leads
Grok 4.5: 65.8 (#42), Llama 3.1 Nemotron 51b Instruct: 43.4 (#229)
| Benchmark | Grok 4.5 | Llama 3.1 Nemotron 51b Instruct |
|---|---|---|
| LMArena Text | 1448 | 1228 |
| LMArena Creative Writing | 1442 | 1213 |
| LMArena Multi-Turn | 1456 | 1227 |
| EQ-Bench Creative Writing | 1579 | — |
Frequently asked questions
Is Grok 4.5 better than Llama 3.1 Nemotron 51b Instruct?
Grok 4.5 is the stronger model overall, scoring 55.0 to 35.9 on the Noometry Index.
Is Grok 4.5 or Llama 3.1 Nemotron 51b Instruct better for coding?
Grok 4.5 scores higher on coding benchmarks: 52.2 versus 35.6 in the Noometry coding category.
How many benchmarks do Grok 4.5 and Llama 3.1 Nemotron 51b Instruct share?
12 benchmarks have published results for both models. Grok 4.5 has 52 scored results on Noometry and Llama 3.1 Nemotron 51b Instruct has 12.