Model comparison
Amazon Nova Experimental Chat 10 20 vs Grok 4 Fast
Amazon Nova Experimental Chat 10 20 is the stronger model overall, scoring 42.1 to 39.4 on the Noometry Index.
Last verified . 17 shared benchmarks.
Summary
- They share 17 benchmarks with published results for both. Amazon Nova Experimental Chat 10 20 scores higher in 4 categories and Grok 4 Fast in 4 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 41.7.
Side by side
| Amazon Nova Experimental Chat 10 20 | Grok 4 Fast | |
|---|---|---|
| Provider | Amazon | xAI |
| Noometry Index | 42.1 | 39.4 |
| Released | — | 2025-09-19 |
| Weights | Proprietary | Proprietary |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 17 | 30 |
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Category by category
Coding Amazon Nova Experimental Chat 10 20 leads
Amazon Nova Experimental Chat 10 20: 41.6 (#123), Grok 4 Fast: 32.5 (#271)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Grok 4 Fast |
|---|---|---|
| LMArena Coding | 1412 | 1429 |
| LMArena WebDev | — | 1159 |
| WeirdML | — | 42.9% |
Agentic & Tool Use Not comparable
Amazon Nova Experimental Chat 10 20: —, Grok 4 Fast: 29.5 (#86)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Grok 4 Fast |
|---|---|---|
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
| LMArena Search | — | 1171 |
Reasoning Amazon Nova Experimental Chat 10 20 leads
Amazon Nova Experimental Chat 10 20: 28.4 (#106), Grok 4 Fast: 22.2 (#201)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Grok 4 Fast |
|---|---|---|
| LMArena Hard Prompts | 1396 | 1412 |
| ARC-AGI-2 | — | 5.3% |
| Kagi LLM Benchmark | — | 66.1% |
| ARC-AGI-1 | — | 48.5% |
| DTBench | — | 82.7% |
| Epoch Capabilities Index | — | 144.2 |
| ForecastBench | — | 60.5 |
Math Too close to call
Amazon Nova Experimental Chat 10 20: 39.0 (#119), Grok 4 Fast: 38.9 (#123)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Grok 4 Fast |
|---|---|---|
| LMArena Math | 1425 | 1419 |
Knowledge Amazon Nova Experimental Chat 10 20 leads
Amazon Nova Experimental Chat 10 20: 38.5 (#144), Grok 4 Fast: 32.0 (#214)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Grok 4 Fast |
|---|---|---|
| LMArena Expert | 1386 | 1411 |
| Vectara Hallucination Rate | — | 19.7% |
Multilingual Grok 4 Fast leads
Amazon Nova Experimental Chat 10 20: 49.5 (#131), Grok 4 Fast: 51.3 (#111)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | 1372 | 1396 |
| LMArena Chinese | 1404 | 1457 |
| LMArena French | 1425 | 1431 |
| LMArena German | 1391 | 1383 |
| LMArena Japanese | 1360 | 1352 |
| LMArena Korean | 1324 | 1357 |
| LMArena Russian | 1371 | 1389 |
| LMArena Spanish | 1382 | 1415 |
Instruction Following Grok 4 Fast leads
Amazon Nova Experimental Chat 10 20: 72.1 (#141), Grok 4 Fast: 73.2 (#121)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | 1365 | 1387 |
Long Context Grok 4 Fast leads
Amazon Nova Experimental Chat 10 20: 41.7 (#133), Grok 4 Fast: 63.2 (#3)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Grok 4 Fast |
|---|---|---|
| LMArena Longer Query | 1370 | 1415 |
| Fiction.LiveBench | — | 94.4% |
Writing & Preference Grok 4 Fast leads
Amazon Nova Experimental Chat 10 20: 56.6 (#136), Grok 4 Fast: 60.0 (#102)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Grok 4 Fast |
|---|---|---|
| LMArena Text | 1394 | 1407 |
| LMArena Creative Writing | 1318 | 1387 |
| LMArena Multi-Turn | 1364 | 1414 |
Frequently asked questions
Is Amazon Nova Experimental Chat 10 20 better than Grok 4 Fast?
Amazon Nova Experimental Chat 10 20 is the stronger model overall, scoring 42.1 to 39.4 on the Noometry Index.
Is Amazon Nova Experimental Chat 10 20 or Grok 4 Fast better for coding?
Amazon Nova Experimental Chat 10 20 scores higher on coding benchmarks: 41.6 versus 32.5 in the Noometry coding category.
How many benchmarks do Amazon Nova Experimental Chat 10 20 and Grok 4 Fast share?
17 benchmarks have published results for both models. Amazon Nova Experimental Chat 10 20 has 17 scored results on Noometry and Grok 4 Fast has 30.