Model comparison
Amazon Nova Experimental Chat 10 09 vs Step 5 Preview
Step 5 Preview is the stronger model overall, scoring 47.9 to 41.9 on the Noometry Index.
Last verified . 9 shared benchmarks.
StepFunSummary
- They share 9 benchmarks with published results for both. Amazon Nova Experimental Chat 10 09 scores higher in 0 categories and Step 5 Preview in 6 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Step 5 Preview leads 40.0 to 27.3.
Side by side
| Amazon Nova Experimental Chat 10 09 | Step 5 Preview | |
|---|---|---|
| Provider | Amazon | StepFun |
| Noometry Index | 41.9 | 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 | 9 | 18 |
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Category by category
Coding Step 5 Preview leads
Amazon Nova Experimental Chat 10 09: 40.2 (#145), Step 5 Preview: 51.8 (#36)
| Benchmark | Amazon Nova Experimental Chat 10 09 | Step 5 Preview |
|---|---|---|
| LMArena Coding | 1370 | 1480 |
| LMArena WebDev | — | 1564 |
| SciCode | — | 58.9% |
Reasoning Step 5 Preview leads
Amazon Nova Experimental Chat 10 09: 27.3 (#120), Step 5 Preview: 40.0 (#57)
| Benchmark | Amazon Nova Experimental Chat 10 09 | Step 5 Preview |
|---|---|---|
| LMArena Hard Prompts | 1356 | 1465 |
| CritPt | — | 20.9% |
Math Not comparable
Amazon Nova Experimental Chat 10 09: —, Step 5 Preview: 46.1 (#72)
| Benchmark | Amazon Nova Experimental Chat 10 09 | Step 5 Preview |
|---|---|---|
| ProofBench | — | 42% |
| LMArena Math | — | 1470 |
Knowledge Not comparable
Amazon Nova Experimental Chat 10 09: —, Step 5 Preview: 41.2 (#112)
| Benchmark | Amazon Nova Experimental Chat 10 09 | Step 5 Preview |
|---|---|---|
| LMArena Expert | — | 1470 |
Multimodal Not comparable
Amazon Nova Experimental Chat 10 09: —, Step 5 Preview: 41.0 (#41)
| Benchmark | Amazon Nova Experimental Chat 10 09 | Step 5 Preview |
|---|---|---|
| LMArena Vision | — | 1267 |
Multilingual Step 5 Preview leads
Amazon Nova Experimental Chat 10 09: 47.3 (#150), Step 5 Preview: 53.8 (#54)
| Benchmark | Amazon Nova Experimental Chat 10 09 | Step 5 Preview |
|---|---|---|
| LMArena Non-English | 1340 | 1432 |
| LMArena Chinese | 1341 | 1519 |
| LMArena Russian | — | 1436 |
| LMArena Spanish | — | 1439 |
Instruction Following Step 5 Preview leads
Amazon Nova Experimental Chat 10 09: 69.4 (#172), Step 5 Preview: 76.0 (#50)
| Benchmark | Amazon Nova Experimental Chat 10 09 | Step 5 Preview |
|---|---|---|
| LMArena Instruction Following | 1315 | 1444 |
Long Context Step 5 Preview leads
Amazon Nova Experimental Chat 10 09: 40.5 (#152), Step 5 Preview: 44.5 (#64)
| Benchmark | Amazon Nova Experimental Chat 10 09 | Step 5 Preview |
|---|---|---|
| LMArena Longer Query | 1333 | 1455 |
Writing & Preference Step 5 Preview leads
Amazon Nova Experimental Chat 10 09: 54.7 (#149), Step 5 Preview: 62.8 (#71)
| Benchmark | Amazon Nova Experimental Chat 10 09 | Step 5 Preview |
|---|---|---|
| LMArena Text | 1364 | 1442 |
| LMArena Creative Writing | 1307 | 1410 |
| LMArena Multi-Turn | 1355 | 1447 |
Frequently asked questions
Is Amazon Nova Experimental Chat 10 09 better than Step 5 Preview?
Step 5 Preview is the stronger model overall, scoring 47.9 to 41.9 on the Noometry Index.
Is Amazon Nova Experimental Chat 10 09 or Step 5 Preview better for coding?
Step 5 Preview scores higher on coding benchmarks: 51.8 versus 40.2 in the Noometry coding category.
How many benchmarks do Amazon Nova Experimental Chat 10 09 and Step 5 Preview share?
9 benchmarks have published results for both models. Amazon Nova Experimental Chat 10 09 has 9 scored results on Noometry and Step 5 Preview has 18.