Model comparison
Amazon Nova Micro vs Grok 4 Fast
Grok 4 Fast is the stronger model overall, scoring 39.4 to 30.4 on the Noometry Index.
Last verified . 18 shared benchmarks.
Summary
- They share 18 benchmarks with published results for both. Amazon Nova Micro scores higher in 0 categories and Grok 4 Fast in 9 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 36.5.
- The biggest single-benchmark swing is Vectara Hallucination Rate: 5.5% for Amazon Nova Micro and 19.7% for Grok 4 Fast.
Side by side
| Amazon Nova Micro | Grok 4 Fast | |
|---|---|---|
| Provider | Amazon | xAI |
| Noometry Index | 30.4 | 39.4 |
| Released | 2024-12-03 | 2025-09-19 |
| Weights | Proprietary | Proprietary |
| Context window | 128K | — |
| Max output | 10K | — |
| Input $ / M tokens | $0.035 | — |
| Output $ / M tokens | $0.14 | — |
| Results tracked | 32 | 30 |
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Category by category
Coding Grok 4 Fast leads
Amazon Nova Micro: 30.5 (#295), Grok 4 Fast: 32.5 (#271)
| Benchmark | Amazon Nova Micro | Grok 4 Fast |
|---|---|---|
| LMArena Coding | 1218 | 1429 |
| LMArena WebDev | — | 1159 |
| WeirdML | — | 42.9% |
| LiveBench Coding | 20.2% | — |
Agentic & Tool Use Grok 4 Fast leads
Amazon Nova Micro: 22.1 (#132), Grok 4 Fast: 29.5 (#86)
| Benchmark | Amazon Nova Micro | Grok 4 Fast |
|---|---|---|
| Berkeley Function Calling Leaderboard | 22.3% | — |
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
| LMArena Search | — | 1171 |
Reasoning Grok 4 Fast leads
Amazon Nova Micro: 17.4 (#294), Grok 4 Fast: 22.2 (#201)
| Benchmark | Amazon Nova Micro | Grok 4 Fast |
|---|---|---|
| LMArena Hard Prompts | 1191 | 1412 |
| ARC-AGI-2 | — | 5.3% |
| Kagi LLM Benchmark | — | 66.1% |
| ARC-AGI-1 | — | 48.5% |
| LiveBench Reasoning | 25.1% | — |
| DTBench | — | 82.7% |
| LiveBench Data Analysis | 34% | — |
| Epoch Capabilities Index | — | 144.2 |
| ForecastBench | — | 60.5 |
| LiveBench | 29.6% | — |
Math Grok 4 Fast leads
Amazon Nova Micro: 26.9 (#254), Grok 4 Fast: 38.9 (#123)
| Benchmark | Amazon Nova Micro | Grok 4 Fast |
|---|---|---|
| LMArena Math | 1206 | 1419 |
| Omni-MATH | 21.4% | — |
| LiveBench Math | 34.5% | — |
Knowledge Grok 4 Fast leads
Amazon Nova Micro: 29.6 (#237), Grok 4 Fast: 32.0 (#214)
| Benchmark | Amazon Nova Micro | Grok 4 Fast |
|---|---|---|
| Vectara Hallucination Rate | 5.5% | 19.7% |
| LMArena Expert | 1184 | 1411 |
| MMLU-Pro | 51.1% | — |
| GPQA (HELM) | 38.3% | — |
| MMLU | 70.8% | — |
Multilingual Grok 4 Fast leads
Amazon Nova Micro: 36.5 (#239), Grok 4 Fast: 51.3 (#111)
| Benchmark | Amazon Nova Micro | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | 1186 | 1396 |
| LMArena Chinese | 1209 | 1457 |
| LMArena French | 1238 | 1431 |
| LMArena German | 1192 | 1383 |
| LMArena Japanese | 1154 | 1352 |
| LMArena Korean | 1150 | 1357 |
| LMArena Russian | 1185 | 1389 |
| LMArena Spanish | 1225 | 1415 |
Instruction Following Grok 4 Fast leads
Amazon Nova Micro: 56.3 (#272), Grok 4 Fast: 73.2 (#121)
| Benchmark | Amazon Nova Micro | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | 1174 | 1387 |
| LiveBench Instruction Following | 48% | — |
| IFEval | 76% | — |
Long Context Grok 4 Fast leads
Amazon Nova Micro: 36.5 (#229), Grok 4 Fast: 63.2 (#3)
| Benchmark | Amazon Nova Micro | Grok 4 Fast |
|---|---|---|
| LMArena Longer Query | 1205 | 1415 |
| Fiction.LiveBench | — | 94.4% |
Writing & Preference Grok 4 Fast leads
Amazon Nova Micro: 39.5 (#247), Grok 4 Fast: 60.0 (#102)
| Benchmark | Amazon Nova Micro | Grok 4 Fast |
|---|---|---|
| LMArena Text | 1208 | 1407 |
| LMArena Creative Writing | 1172 | 1387 |
| LMArena Multi-Turn | 1178 | 1414 |
| WildBench | 74.3% | — |
| LiveBench Language | 15.8% | — |
Frequently asked questions
Is Amazon Nova Micro better than Grok 4 Fast?
Grok 4 Fast is the stronger model overall, scoring 39.4 to 30.4 on the Noometry Index.
Is Amazon Nova Micro or Grok 4 Fast better for coding?
Grok 4 Fast scores higher on coding benchmarks: 32.5 versus 30.5 in the Noometry coding category.
How many benchmarks do Amazon Nova Micro and Grok 4 Fast share?
18 benchmarks have published results for both models. Amazon Nova Micro has 32 scored results on Noometry and Grok 4 Fast has 30.