Model comparison
Amazon Nova Experimental Chat 12 10 vs Grok 4 Fast
Amazon Nova Experimental Chat 12 10 is the stronger model overall, scoring 42.9 to 39.4 on the Noometry Index.
Last verified . 12 shared benchmarks.
Summary
- They share 12 benchmarks with published results for both. Amazon Nova Experimental Chat 12 10 scores higher in 4 categories and Grok 4 Fast in 4 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 42.4.
Side by side
| Amazon Nova Experimental Chat 12 10 | Grok 4 Fast | |
|---|---|---|
| Provider | Amazon | xAI |
| Noometry Index | 42.9 | 39.4 |
| Released | — | 2025-09-19 |
| Weights | Proprietary | Proprietary |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 12 | 30 |
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Category by category
Coding Amazon Nova Experimental Chat 12 10 leads
Amazon Nova Experimental Chat 12 10: 42.2 (#110), Grok 4 Fast: 32.5 (#271)
| Benchmark | Amazon Nova Experimental Chat 12 10 | Grok 4 Fast |
|---|---|---|
| LMArena Coding | 1430 | 1429 |
| LMArena WebDev | — | 1159 |
| WeirdML | — | 42.9% |
Agentic & Tool Use Not comparable
Amazon Nova Experimental Chat 12 10: —, Grok 4 Fast: 29.5 (#86)
| Benchmark | Amazon Nova Experimental Chat 12 10 | Grok 4 Fast |
|---|---|---|
| τ²-bench Banking | — | 15.7% |
| Cybench | — | 30% |
| LMArena Search | — | 1171 |
Reasoning Amazon Nova Experimental Chat 12 10 leads
Amazon Nova Experimental Chat 12 10: 29.3 (#94), Grok 4 Fast: 22.2 (#201)
| Benchmark | Amazon Nova Experimental Chat 12 10 | Grok 4 Fast |
|---|---|---|
| LMArena Hard Prompts | 1427 | 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 12 10: 38.9 (#124), Grok 4 Fast: 38.9 (#123)
| Benchmark | Amazon Nova Experimental Chat 12 10 | Grok 4 Fast |
|---|---|---|
| LMArena Math | 1419 | 1419 |
Knowledge Amazon Nova Experimental Chat 12 10 leads
Amazon Nova Experimental Chat 12 10: 39.2 (#136), Grok 4 Fast: 32.0 (#214)
| Benchmark | Amazon Nova Experimental Chat 12 10 | Grok 4 Fast |
|---|---|---|
| LMArena Expert | 1408 | 1411 |
| Vectara Hallucination Rate | — | 19.7% |
Multilingual Too close to call
Amazon Nova Experimental Chat 12 10: 51.4 (#108), Grok 4 Fast: 51.3 (#111)
| Benchmark | Amazon Nova Experimental Chat 12 10 | Grok 4 Fast |
|---|---|---|
| LMArena Non-English | 1398 | 1396 |
| LMArena Chinese | 1440 | 1457 |
| LMArena Russian | 1395 | 1389 |
| LMArena French | — | 1431 |
| LMArena German | — | 1383 |
| LMArena Japanese | — | 1352 |
| LMArena Korean | — | 1357 |
| LMArena Spanish | — | 1415 |
Instruction Following Too close to call
Amazon Nova Experimental Chat 12 10: 73.2 (#123), Grok 4 Fast: 73.2 (#121)
| Benchmark | Amazon Nova Experimental Chat 12 10 | Grok 4 Fast |
|---|---|---|
| LMArena Instruction Following | 1387 | 1387 |
Long Context Grok 4 Fast leads
Amazon Nova Experimental Chat 12 10: 42.4 (#125), Grok 4 Fast: 63.2 (#3)
| Benchmark | Amazon Nova Experimental Chat 12 10 | Grok 4 Fast |
|---|---|---|
| LMArena Longer Query | 1391 | 1415 |
| Fiction.LiveBench | — | 94.4% |
Writing & Preference Too close to call
Amazon Nova Experimental Chat 12 10: 59.5 (#110), Grok 4 Fast: 60.0 (#102)
| Benchmark | Amazon Nova Experimental Chat 12 10 | Grok 4 Fast |
|---|---|---|
| LMArena Text | 1420 | 1407 |
| LMArena Creative Writing | 1350 | 1387 |
| LMArena Multi-Turn | 1409 | 1414 |
Frequently asked questions
Is Amazon Nova Experimental Chat 12 10 better than Grok 4 Fast?
Amazon Nova Experimental Chat 12 10 is the stronger model overall, scoring 42.9 to 39.4 on the Noometry Index.
Is Amazon Nova Experimental Chat 12 10 or Grok 4 Fast better for coding?
Amazon Nova Experimental Chat 12 10 scores higher on coding benchmarks: 42.2 versus 32.5 in the Noometry coding category.
How many benchmarks do Amazon Nova Experimental Chat 12 10 and Grok 4 Fast share?
12 benchmarks have published results for both models. Amazon Nova Experimental Chat 12 10 has 12 scored results on Noometry and Grok 4 Fast has 30.