Model comparison
Grok 4 Fast vs Nemotron 4 340b Instruct
Grok 4 Fast is the stronger model overall, scoring 39.0 to 35.3 on the Noometry Index.
Last verified . 17 shared benchmarks.
NVIDIASummary
- They share 17 benchmarks with published results for both. Grok 4 Fast scores higher in 7 categories and Nemotron 4 340b Instruct in 1 category; 6 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 37.1.
- Nemotron 4 340b Instruct has downloadable open weights; the other is API-only.
Side by side
| Grok 4 Fast | Nemotron 4 340b Instruct | |
|---|---|---|
| Provider | xAI | NVIDIA |
| Noometry Index | 39.0 | 35.3 |
| Released | 2025-09-19 | 2024-06-14 |
| Weights | Proprietary | Open |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 30 | 17 |
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Category by category
Coding Nemotron 4 340b Instruct leads
Grok 4 Fast: 32.3 (#264), Nemotron 4 340b Instruct: 34.6 (#223)
| Benchmark | Grok 4 Fast | Nemotron 4 340b Instruct |
|---|---|---|
| LMArena Coding | 1429 | 1209 |
| LMArena WebDev | 1160 | — |
| WeirdML | 42.9% | — |
Agentic & Tool Use Not comparable
Grok 4 Fast: 29.3 (#80), Nemotron 4 340b Instruct: —
| Benchmark | Grok 4 Fast | Nemotron 4 340b Instruct |
|---|---|---|
| τ²-bench Banking | 15.7% | — |
| Cybench | 30% | — |
| LMArena Search | 1171 | — |
Reasoning Too close to call
Grok 4 Fast: 22.5 (#179), Nemotron 4 340b Instruct: 22.4 (#180)
| Benchmark | Grok 4 Fast | Nemotron 4 340b Instruct |
|---|---|---|
| LMArena Hard Prompts | 1413 | 1202 |
| ARC-AGI-2 | 5.3% | — |
| Kagi LLM Benchmark | 66.1% | — |
| ARC-AGI-1 | 48.5% | — |
| DTBench | 82.7% | — |
| Epoch Capabilities Index | 144.21 | — |
| ForecastBench | 60.5 | — |
Math Grok 4 Fast leads
Grok 4 Fast: 36.1 (#126), Nemotron 4 340b Instruct: 31.7 (#193)
| Benchmark | Grok 4 Fast | Nemotron 4 340b Instruct |
|---|---|---|
| LMArena Math | 1419 | 1216 |
Knowledge Too close to call
Grok 4 Fast: 31.5 (#211), Nemotron 4 340b Instruct: 31.4 (#212)
| Benchmark | Grok 4 Fast | Nemotron 4 340b Instruct |
|---|---|---|
| LMArena Expert | 1411 | 1171 |
| Vectara Hallucination Rate | 19.7% | — |
Multilingual Grok 4 Fast leads
Grok 4 Fast: 51.5 (#106), Nemotron 4 340b Instruct: 38.0 (#228)
| Benchmark | Grok 4 Fast | Nemotron 4 340b Instruct |
|---|---|---|
| LMArena Non-English | 1397 | 1206 |
| LMArena Chinese | 1458 | 1214 |
| LMArena French | 1433 | 1196 |
| LMArena German | 1383 | 1192 |
| LMArena Japanese | 1358 | 1128 |
| LMArena Korean | 1359 | 1148 |
| LMArena Russian | 1387 | 1219 |
| LMArena Spanish | 1414 | 1195 |
Instruction Following Grok 4 Fast leads
Grok 4 Fast: 73.4 (#116), Nemotron 4 340b Instruct: 63.3 (#227)
| Benchmark | Grok 4 Fast | Nemotron 4 340b Instruct |
|---|---|---|
| LMArena Instruction Following | 1388 | 1203 |
Long Context Grok 4 Fast leads
Grok 4 Fast: 63.2 (#3), Nemotron 4 340b Instruct: 37.1 (#216)
| Benchmark | Grok 4 Fast | Nemotron 4 340b Instruct |
|---|---|---|
| LMArena Longer Query | 1415 | 1225 |
| Fiction.LiveBench | 94.4% | — |
Writing & Preference Grok 4 Fast leads
Grok 4 Fast: 60.2 (#96), Nemotron 4 340b Instruct: 42.9 (#229)
| Benchmark | Grok 4 Fast | Nemotron 4 340b Instruct |
|---|---|---|
| LMArena Text | 1407 | 1225 |
| LMArena Creative Writing | 1388 | 1203 |
| LMArena Multi-Turn | 1414 | 1214 |
Frequently asked questions
Is Grok 4 Fast better than Nemotron 4 340b Instruct?
Grok 4 Fast is the stronger model overall, scoring 39.0 to 35.3 on the Noometry Index.
Is Grok 4 Fast or Nemotron 4 340b Instruct better for coding?
Nemotron 4 340b Instruct scores higher on coding benchmarks: 34.6 versus 32.3 in the Noometry coding category.
How many benchmarks do Grok 4 Fast and Nemotron 4 340b Instruct share?
17 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Nemotron 4 340b Instruct has 17.