Model comparison
Amazon Nova Experimental Chat 10 20 vs Step 5 Preview
Step 5 Preview is the stronger model overall, scoring 47.9 to 42.1 on the Noometry Index.
Last verified . 13 shared benchmarks.
StepFunSummary
- They share 13 benchmarks with published results for both. Amazon Nova Experimental Chat 10 20 scores higher in 0 categories and Step 5 Preview in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Step 5 Preview leads 40.0 to 28.4.
Side by side
| Amazon Nova Experimental Chat 10 20 | Step 5 Preview | |
|---|---|---|
| Provider | Amazon | StepFun |
| Noometry Index | 42.1 | 47.9 |
| Released | — | 2026-09-16 |
| Weights | Proprietary | Proprietary |
| Context window | — | 1.02M |
| Max output | — | 66K |
| Input $ / M tokens | — | $1 |
| Output $ / M tokens | — | $2.70 |
| Results tracked | 17 | 18 |
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Category by category
Coding Step 5 Preview leads
Amazon Nova Experimental Chat 10 20: 41.6 (#123), Step 5 Preview: 51.8 (#36)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Step 5 Preview |
|---|---|---|
| LMArena Coding | 1412 | 1480 |
| LMArena WebDev | — | 1564 |
| SciCode | — | 58.9% |
Reasoning Step 5 Preview leads
Amazon Nova Experimental Chat 10 20: 28.4 (#106), Step 5 Preview: 40.0 (#57)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Step 5 Preview |
|---|---|---|
| LMArena Hard Prompts | 1396 | 1465 |
| CritPt | — | 20.9% |
Math Step 5 Preview leads
Amazon Nova Experimental Chat 10 20: 39.0 (#119), Step 5 Preview: 46.1 (#72)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Step 5 Preview |
|---|---|---|
| LMArena Math | 1425 | 1470 |
| ProofBench | — | 42% |
Knowledge Step 5 Preview leads
Amazon Nova Experimental Chat 10 20: 38.5 (#144), Step 5 Preview: 41.2 (#112)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Step 5 Preview |
|---|---|---|
| LMArena Expert | 1386 | 1470 |
Multimodal Not comparable
Amazon Nova Experimental Chat 10 20: —, Step 5 Preview: 41.0 (#41)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Step 5 Preview |
|---|---|---|
| LMArena Vision | — | 1267 |
Multilingual Step 5 Preview leads
Amazon Nova Experimental Chat 10 20: 49.5 (#131), Step 5 Preview: 53.8 (#54)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Step 5 Preview |
|---|---|---|
| LMArena Non-English | 1372 | 1432 |
| LMArena Chinese | 1404 | 1519 |
| LMArena Russian | 1371 | 1436 |
| LMArena Spanish | 1382 | 1439 |
| LMArena French | 1425 | — |
| LMArena German | 1391 | — |
| LMArena Japanese | 1360 | — |
| LMArena Korean | 1324 | — |
Instruction Following Step 5 Preview leads
Amazon Nova Experimental Chat 10 20: 72.1 (#141), Step 5 Preview: 76.0 (#50)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Step 5 Preview |
|---|---|---|
| LMArena Instruction Following | 1365 | 1444 |
Long Context Step 5 Preview leads
Amazon Nova Experimental Chat 10 20: 41.7 (#133), Step 5 Preview: 44.5 (#64)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Step 5 Preview |
|---|---|---|
| LMArena Longer Query | 1370 | 1455 |
Writing & Preference Step 5 Preview leads
Amazon Nova Experimental Chat 10 20: 56.6 (#136), Step 5 Preview: 62.8 (#71)
| Benchmark | Amazon Nova Experimental Chat 10 20 | Step 5 Preview |
|---|---|---|
| LMArena Text | 1394 | 1442 |
| LMArena Creative Writing | 1318 | 1410 |
| LMArena Multi-Turn | 1364 | 1447 |
Frequently asked questions
Is Amazon Nova Experimental Chat 10 20 better than Step 5 Preview?
Step 5 Preview is the stronger model overall, scoring 47.9 to 42.1 on the Noometry Index.
Is Amazon Nova Experimental Chat 10 20 or Step 5 Preview better for coding?
Step 5 Preview scores higher on coding benchmarks: 51.8 versus 41.6 in the Noometry coding category.
How many benchmarks do Amazon Nova Experimental Chat 10 20 and Step 5 Preview share?
13 benchmarks have published results for both models. Amazon Nova Experimental Chat 10 20 has 17 scored results on Noometry and Step 5 Preview has 18.