Model comparison
Amazon Nova Experimental Chat 26 02 10 vs Grok 4.5
Grok 4.5 is the stronger model overall, scoring 55.0 to 44.5 on the Noometry Index.
Last verified . 12 shared benchmarks.
Summary
- They share 12 benchmarks with published results for both. Amazon Nova Experimental Chat 26 02 10 scores higher in 0 categories and Grok 4.5 in 8 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.5 leads 56.1 to 30.1.
Side by side
| Amazon Nova Experimental Chat 26 02 10 | Grok 4.5 | |
|---|---|---|
| Provider | Amazon | xAI |
| Noometry Index | 44.5 | 55.0 |
| Released | — | 2026-07-08 |
| Weights | Proprietary | Proprietary |
| Context window | — | 500K |
| Max output | — | 500K |
| Input $ / M tokens | — | $2 |
| Output $ / M tokens | — | $6 |
| Results tracked | 12 | 52 |
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Category by category
Coding Grok 4.5 leads
Amazon Nova Experimental Chat 26 02 10: 43.9 (#82), Grok 4.5: 52.2 (#35)
| Benchmark | Amazon Nova Experimental Chat 26 02 10 | Grok 4.5 |
|---|---|---|
| LMArena Coding | 1483 | 1474 |
| DeepSWE | — | 53.8% |
| FrontierCode | — | 42.4% |
| LMArena WebDev | — | 1553 |
| SciCode | — | 54.1% |
| WeirdML | — | 46.4% |
| ALE-Bench | — | 1,309 |
Agentic & Tool Use Not comparable
Amazon Nova Experimental Chat 26 02 10: —, Grok 4.5: 44.4 (#17)
| Benchmark | Amazon Nova Experimental Chat 26 02 10 | Grok 4.5 |
|---|---|---|
| APEX-Agents | — | 56.2% |
| τ²-bench Banking | — | 47.9% |
| PostTrainBench | — | 23.4% |
| GBAEval | — | 65.4% |
| GDP.pdf | — | 14% |
| LMArena Search | — | 1213 |
| Vending-Bench 2 | — | 3,887 |
Reasoning Grok 4.5 leads
Amazon Nova Experimental Chat 26 02 10: 30.1 (#86), Grok 4.5: 56.1 (#25)
| Benchmark | Amazon Nova Experimental Chat 26 02 10 | Grok 4.5 |
|---|---|---|
| LMArena Hard Prompts | 1458 | 1462 |
| ARC-AGI-2 | — | 52.6% |
| SimpleBench | — | 70% |
| Kagi LLM Benchmark | — | 83.5% |
| NYT Connections (extended) | — | 79.9% |
| ARC-AGI-1 | — | 87.2% |
| CritPt | — | 15.4% |
| Chess Puzzles | — | 36% |
| DTBench | — | 96.5% |
| LMCA | — | 45.2% |
| Surface Evolver Bench | — | 74.4% |
| Epoch Capabilities Index | — | 153.92 |
Math Grok 4.5 leads
Amazon Nova Experimental Chat 26 02 10: 39.3 (#109), Grok 4.5: 60.9 (#35)
| Benchmark | Amazon Nova Experimental Chat 26 02 10 | Grok 4.5 |
|---|---|---|
| LMArena Math | 1438 | 1459 |
| FrontierMath (Tiers 1-3) | — | 57.2% |
| FrontierMath Tier 4 | — | 24.4% |
| OTIS Mock AIME 2024-2025 | — | 97.8% |
| ProofBench | — | 31% |
Knowledge Grok 4.5 leads
Amazon Nova Experimental Chat 26 02 10: 42.3 (#97), Grok 4.5: 62.3 (#24)
| Benchmark | Amazon Nova Experimental Chat 26 02 10 | Grok 4.5 |
|---|---|---|
| LMArena Expert | 1506 | 1466 |
| GPQA Diamond | — | 93.4% |
| SimpleQA Verified | — | 48.3% |
Multimodal Not comparable
Amazon Nova Experimental Chat 26 02 10: —, Grok 4.5: 37.6 (#72)
| Benchmark | Amazon Nova Experimental Chat 26 02 10 | Grok 4.5 |
|---|---|---|
| LMArena Vision | — | 1288 |
| Blueprint-Bench 2 | — | 27.3% |
| Furniture Assembly | — | 22.5% |
| LMArena Document | — | 1452 |
Multilingual Too close to call
Amazon Nova Experimental Chat 26 02 10: 54.0 (#50), Grok 4.5: 54.4 (#42)
| Benchmark | Amazon Nova Experimental Chat 26 02 10 | Grok 4.5 |
|---|---|---|
| LMArena Non-English | 1434 | 1440 |
| LMArena Chinese | 1463 | 1496 |
| LMArena Russian | 1423 | 1448 |
| LMArena French | — | 1456 |
| LMArena German | — | 1446 |
| LMArena Japanese | — | 1428 |
| LMArena Korean | — | 1404 |
| LMArena Spanish | — | 1450 |
Instruction Following Too close to call
Amazon Nova Experimental Chat 26 02 10: 75.2 (#69), Grok 4.5: 76.0 (#48)
| Benchmark | Amazon Nova Experimental Chat 26 02 10 | Grok 4.5 |
|---|---|---|
| LMArena Instruction Following | 1427 | 1446 |
Long Context Too close to call
Amazon Nova Experimental Chat 26 02 10: 44.0 (#77), Grok 4.5: 44.8 (#56)
| Benchmark | Amazon Nova Experimental Chat 26 02 10 | Grok 4.5 |
|---|---|---|
| LMArena Longer Query | 1441 | 1463 |
Writing & Preference Grok 4.5 leads
Amazon Nova Experimental Chat 26 02 10: 61.8 (#84), Grok 4.5: 65.8 (#42)
| Benchmark | Amazon Nova Experimental Chat 26 02 10 | Grok 4.5 |
|---|---|---|
| LMArena Text | 1448 | 1448 |
| LMArena Creative Writing | 1368 | 1442 |
| LMArena Multi-Turn | 1442 | 1456 |
| EQ-Bench Creative Writing | — | 1579 |
Frequently asked questions
Is Amazon Nova Experimental Chat 26 02 10 better than Grok 4.5?
Grok 4.5 is the stronger model overall, scoring 55.0 to 44.5 on the Noometry Index.
Is Amazon Nova Experimental Chat 26 02 10 or Grok 4.5 better for coding?
Grok 4.5 scores higher on coding benchmarks: 52.2 versus 43.9 in the Noometry coding category.
How many benchmarks do Amazon Nova Experimental Chat 26 02 10 and Grok 4.5 share?
12 benchmarks have published results for both models. Amazon Nova Experimental Chat 26 02 10 has 12 scored results on Noometry and Grok 4.5 has 52.