Model comparison
Amazon Nova Pro vs Grok 4.1 Fast
Grok 4.1 Fast is the stronger model overall, scoring 40.9 to 30.5 on the Noometry Index.
Last verified . 20 shared benchmarks.
Summary
- They share 20 benchmarks with published results for both. Amazon Nova Pro scores higher in 1 category and Grok 4.1 Fast in 9 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 42.3 to 19.2.
- The biggest single-benchmark swing is Berkeley Function Calling Leaderboard: 25% for Amazon Nova Pro and 69.6% for Grok 4.1 Fast.
- Grok 4.1 Fast is cheaper at $0.20 / $0.50 per million input/output tokens, against $0.80 / $3.20 for Amazon Nova Pro.
- Amazon Nova Pro accepts more context: 300K tokens versus 128K.
Side by side
| Amazon Nova Pro | Grok 4.1 Fast | |
|---|---|---|
| Provider | Amazon | xAI |
| Noometry Index | 30.5 | 40.9 |
| Released | 2024-12-03 | 2025-06-27 |
| Weights | Proprietary | Proprietary |
| Context window | 300K | 128K |
| Max output | 10K | 30K |
| Input $ / M tokens | $0.80 | $0.20 |
| Output $ / M tokens | $3.20 | $0.50 |
| Results tracked | 38 | 32 |
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Category by category
Coding Too close to call
Amazon Nova Pro: 34.6 (#224), Grok 4.1 Fast: 33.8 (#236)
| Benchmark | Amazon Nova Pro | Grok 4.1 Fast |
|---|---|---|
| LMArena Coding | 1270 | 1411 |
| LMArena WebDev | — | 1241 |
| LiveBench Coding | 38.1% | — |
| ALE-Bench | — | 394.93 |
Agentic & Tool Use Grok 4.1 Fast leads
Amazon Nova Pro: 16.6 (#139), Grok 4.1 Fast: 36.1 (#35)
| Benchmark | Amazon Nova Pro | Grok 4.1 Fast |
|---|---|---|
| Berkeley Function Calling Leaderboard | 25% | 69.6% |
| TheAgentCompany | 1.7% | — |
| τ²-bench Banking | — | 13.1% |
| LMArena Search | — | 1171 |
| Vending-Bench 2 | — | 1,107 |
Reasoning Grok 4.1 Fast leads
Amazon Nova Pro: 19.2 (#240), Grok 4.1 Fast: 42.3 (#45)
| Benchmark | Amazon Nova Pro | Grok 4.1 Fast |
|---|---|---|
| LMArena Hard Prompts | 1246 | 1407 |
| SimpleBench | — | 56% |
| NYT Connections (extended) | — | 87.4% |
| LiveBench Reasoning | 32.6% | — |
| DTBench | — | 87.7% |
| LiveBench Data Analysis | 48.3% | — |
| Epoch Capabilities Index | 123.75 | — |
| ForecastBench | — | 61 |
| LiveBench | 43.5% | — |
Math Grok 4.1 Fast leads
Amazon Nova Pro: 26.4 (#240), Grok 4.1 Fast: 30.9 (#201)
| Benchmark | Amazon Nova Pro | Grok 4.1 Fast |
|---|---|---|
| LMArena Math | 1252 | 1408 |
| MathArena Final-Answer Competitions | — | 60.9% |
| ProofBench | — | 4% |
| Omni-MATH | 24.2% | — |
| LiveBench Math | 38% | — |
Knowledge Grok 4.1 Fast leads
Amazon Nova Pro: 27.1 (#246), Grok 4.1 Fast: 32.6 (#203)
| Benchmark | Amazon Nova Pro | Grok 4.1 Fast |
|---|---|---|
| Vectara Hallucination Rate | 5.1% | 17.8% |
| LMArena Expert | 1211 | 1398 |
| Humanity's Last Exam | 4.4% | — |
| MMLU-Pro | 67.3% | — |
| Confabulations | 30.1% | — |
| GPQA (HELM) | 44.6% | — |
| MMLU | 82% | — |
Multimodal Grok 4.1 Fast leads
Amazon Nova Pro: 24.5 (#121), Grok 4.1 Fast: 36.3 (#71)
| Benchmark | Amazon Nova Pro | Grok 4.1 Fast |
|---|---|---|
| LMArena Vision | 980 | 1201 |
Multilingual Grok 4.1 Fast leads
Amazon Nova Pro: 39.9 (#218), Grok 4.1 Fast: 51.1 (#110)
| Benchmark | Amazon Nova Pro | Grok 4.1 Fast |
|---|---|---|
| LMArena Non-English | 1234 | 1391 |
| LMArena Chinese | 1244 | 1441 |
| LMArena French | 1270 | 1416 |
| LMArena German | 1243 | 1404 |
| LMArena Japanese | 1200 | 1347 |
| LMArena Korean | 1203 | 1361 |
| LMArena Russian | 1240 | 1387 |
| LMArena Spanish | 1182 | 1411 |
Instruction Following Grok 4.1 Fast leads
Amazon Nova Pro: 65.1 (#221), Grok 4.1 Fast: 72.8 (#127)
| Benchmark | Amazon Nova Pro | Grok 4.1 Fast |
|---|---|---|
| LMArena Instruction Following | 1235 | 1376 |
| LiveBench Instruction Following | 67.1% | — |
| IFEval | 81.5% | — |
Long Context Grok 4.1 Fast leads
Amazon Nova Pro: 38.1 (#199), Grok 4.1 Fast: 42.4 (#121)
| Benchmark | Amazon Nova Pro | Grok 4.1 Fast |
|---|---|---|
| LMArena Longer Query | 1255 | 1390 |
Writing & Preference Grok 4.1 Fast leads
Amazon Nova Pro: 44.1 (#221), Grok 4.1 Fast: 57.4 (#126)
| Benchmark | Amazon Nova Pro | Grok 4.1 Fast |
|---|---|---|
| LMArena Text | 1259 | 1408 |
| LMArena Creative Writing | 1212 | 1394 |
| LMArena Multi-Turn | 1245 | 1389 |
| Short-Story Creative Writing | 60.5% | — |
| EQ-Bench Creative Writing | — | 1327 |
| WildBench | 77.7% | — |
| LiveBench Language | 37% | — |
Frequently asked questions
Is Amazon Nova Pro better than Grok 4.1 Fast?
Grok 4.1 Fast is the stronger model overall, scoring 40.9 to 30.5 on the Noometry Index.
Which is cheaper, Amazon Nova Pro or Grok 4.1 Fast?
Grok 4.1 Fast is cheaper. It lists at $0.20 per million input tokens and $0.50 per million output tokens; Amazon Nova Pro lists at $0.80 and $3.20.
Is Amazon Nova Pro or Grok 4.1 Fast better for coding?
They score almost the same on coding (34.6 vs 33.8); test both on your own repository before choosing.
Which has the bigger context window?
Amazon Nova Pro does, with 300K tokens against 128K.
How many benchmarks do Amazon Nova Pro and Grok 4.1 Fast share?
20 benchmarks have published results for both models. Amazon Nova Pro has 38 scored results on Noometry and Grok 4.1 Fast has 32.