Model comparison
Amazon Nova Pro vs Grok 4 Fast
Grok 4 Fast is the stronger model overall, scoring 39.4 to 31.0 on the Noometry Index.
Last verified . 19 shared benchmarks.
Summary
- They share 19 benchmarks with published results for both. Amazon Nova Pro scores higher in 1 category and Grok 4 Fast in 8 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 38.1.
- The biggest single-benchmark swing is Vectara Hallucination Rate: 5.1% for Amazon Nova Pro and 19.7% for Grok 4 Fast.
Side by side
| Amazon Nova Pro | Grok 4 Fast | |
|---|---|---|
| Provider | Amazon | xAI |
| Noometry Index | 31.0 | 39.4 |
| Released | 2024-12-03 | 2025-09-19 |
| Weights | Proprietary | Proprietary |
| Context window | 300K | — |
| Max output | 10K | — |
| Input $ / M tokens | $0.80 | — |
| Output $ / M tokens | $3.20 | — |
| Results tracked | 38 | 30 |
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Category by category
Coding Amazon Nova Pro leads
Amazon Nova Pro: 35.1 (#229), Grok 4 Fast: 32.5 (#271)
| Benchmark | Amazon Nova Pro | Grok 4 Fast |
|---|---|---|
| LMArena Coding | 1270 | 1429 |
| LMArena WebDev | — | 1159 |
| WeirdML | — | 42.9% |
| LiveBench Coding | 38.1% | — |
Agentic & Tool Use Grok 4 Fast leads
Amazon Nova Pro: 16.7 (#147), Grok 4 Fast: 29.5 (#86)
| Benchmark | Amazon Nova Pro | Grok 4 Fast |
|---|---|---|
| Berkeley Function Calling Leaderboard | 25% | — |
| TheAgentCompany | 1.7% | — |
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
| LMArena Search | — | 1171 |
Reasoning Grok 4 Fast leads
Amazon Nova Pro: 20.0 (#243), Grok 4 Fast: 22.2 (#201)
| Benchmark | Amazon Nova Pro | Grok 4 Fast |
|---|---|---|
| LMArena Hard Prompts | 1246 | 1412 |
| Epoch Capabilities Index | 123.8 | 144.2 |
| ARC-AGI-2 | — | 5.3% |
| Kagi LLM Benchmark | — | 66.1% |
| ARC-AGI-1 | — | 48.5% |
| LiveBench Reasoning | 32.6% | — |
| DTBench | — | 82.7% |
| LiveBench Data Analysis | 48.3% | — |
| ForecastBench | — | 60.5 |
| LiveBench | 43.5% | — |
Math Grok 4 Fast leads
Amazon Nova Pro: 28.5 (#243), Grok 4 Fast: 38.9 (#123)
| Benchmark | Amazon Nova Pro | Grok 4 Fast |
|---|---|---|
| LMArena Math | 1252 | 1419 |
| Omni-MATH | 24.2% | — |
| LiveBench Math | 38% | — |
Knowledge Grok 4 Fast leads
Amazon Nova Pro: 27.4 (#250), Grok 4 Fast: 32.0 (#214)
| Benchmark | Amazon Nova Pro | Grok 4 Fast |
|---|---|---|
| Vectara Hallucination Rate | 5.1% | 19.7% |
| LMArena Expert | 1211 | 1411 |
| Humanity's Last Exam | 4.4% | — |
| MMLU-Pro | 67.3% | — |
| Confabulations | 30.1% | — |
| GPQA (HELM) | 44.6% | — |
| MMLU | 82% | — |
Multimodal Not comparable
Amazon Nova Pro: 25.0 (#126), Grok 4 Fast: —
| Benchmark | Amazon Nova Pro | Grok 4 Fast |
|---|---|---|
| LMArena Vision | 980 | — |
Multilingual Grok 4 Fast leads
Amazon Nova Pro: 39.7 (#223), Grok 4 Fast: 51.3 (#111)
| Benchmark | Amazon Nova Pro | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | 1234 | 1396 |
| LMArena Chinese | 1244 | 1457 |
| LMArena French | 1271 | 1431 |
| LMArena German | 1243 | 1383 |
| LMArena Japanese | 1200 | 1352 |
| LMArena Korean | 1203 | 1357 |
| LMArena Russian | 1240 | 1389 |
| LMArena Spanish | 1182 | 1415 |
Instruction Following Grok 4 Fast leads
Amazon Nova Pro: 64.9 (#226), Grok 4 Fast: 73.2 (#121)
| Benchmark | Amazon Nova Pro | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | 1235 | 1387 |
| LiveBench Instruction Following | 67.1% | — |
| IFEval | 81.5% | — |
Long Context Grok 4 Fast leads
Amazon Nova Pro: 38.1 (#205), Grok 4 Fast: 63.2 (#3)
| Benchmark | Amazon Nova Pro | Grok 4 Fast |
|---|---|---|
| LMArena Longer Query | 1255 | 1415 |
| Fiction.LiveBench | — | 94.4% |
Writing & Preference Grok 4 Fast leads
Amazon Nova Pro: 43.9 (#226), Grok 4 Fast: 60.0 (#102)
| Benchmark | Amazon Nova Pro | Grok 4 Fast |
|---|---|---|
| LMArena Text | 1259 | 1407 |
| LMArena Creative Writing | 1212 | 1387 |
| LMArena Multi-Turn | 1246 | 1414 |
| Short-Story Creative Writing | 60.5% | — |
| WildBench | 77.7% | — |
| LiveBench Language | 37% | — |
Frequently asked questions
Is Amazon Nova Pro better than Grok 4 Fast?
Grok 4 Fast is the stronger model overall, scoring 39.4 to 31.0 on the Noometry Index.
Is Amazon Nova Pro or Grok 4 Fast better for coding?
Amazon Nova Pro scores higher on coding benchmarks: 35.1 versus 32.5 in the Noometry coding category.
How many benchmarks do Amazon Nova Pro and Grok 4 Fast share?
19 benchmarks have published results for both models. Amazon Nova Pro has 38 scored results on Noometry and Grok 4 Fast has 30.