# Amazon Nova Experimental Chat 12 10 vs Step 5 Preview

> Step 5 Preview is the stronger model overall, scoring 47.9 to 42.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/amazon-nova-experimental-chat-12-10-vs-step-5-preview
- Last updated: 2026-10-11
- Shared benchmarks: 12

## Summary

- They share 12 benchmarks with published results for both. Amazon Nova Experimental Chat 12 10 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 29.3.

## Snapshot

| | Amazon Nova Experimental Chat 12 10 | Step 5 Preview |
|---|---|---|
| Provider | Amazon | StepFun |
| Noometry Index | 42.9 | 47.9 |
| Rank | 104 | 58 |
| Context | — | 1.02M |
| Input $/M | — | $1 |
| Output $/M | — | $2.70 |
| Weights | Proprietary | Proprietary |

## Coding

- Amazon Nova Experimental Chat 12 10: 42.2 (#110)
- Step 5 Preview: 51.8 (#36)

| Benchmark | Amazon Nova Experimental Chat 12 10 | Step 5 Preview |
|---|---|---|
| LMArena Coding | 1430 | 1480 |
| LMArena WebDev | — | 1564 |
| SciCode | — | 58.9% |

## Reasoning

- Amazon Nova Experimental Chat 12 10: 29.3 (#94)
- Step 5 Preview: 40.0 (#57)

| Benchmark | Amazon Nova Experimental Chat 12 10 | Step 5 Preview |
|---|---|---|
| LMArena Hard Prompts | 1427 | 1465 |
| CritPt | — | 20.9% |

## Math

- Amazon Nova Experimental Chat 12 10: 38.9 (#124)
- Step 5 Preview: 46.1 (#72)

| Benchmark | Amazon Nova Experimental Chat 12 10 | Step 5 Preview |
|---|---|---|
| LMArena Math | 1419 | 1470 |
| ProofBench | — | 42% |

## Knowledge

- Amazon Nova Experimental Chat 12 10: 39.2 (#136)
- Step 5 Preview: 41.2 (#112)

| Benchmark | Amazon Nova Experimental Chat 12 10 | Step 5 Preview |
|---|---|---|
| LMArena Expert | 1408 | 1470 |

## Multimodal

- Amazon Nova Experimental Chat 12 10: —
- Step 5 Preview: 41.0 (#41)

| Benchmark | Amazon Nova Experimental Chat 12 10 | Step 5 Preview |
|---|---|---|
| LMArena Vision | — | 1267 |

## Multilingual

- Amazon Nova Experimental Chat 12 10: 51.4 (#108)
- Step 5 Preview: 53.8 (#54)

| Benchmark | Amazon Nova Experimental Chat 12 10 | Step 5 Preview |
|---|---|---|
| LMArena Non-English | 1398 | 1432 |
| LMArena Chinese | 1440 | 1519 |
| LMArena Russian | 1395 | 1436 |
| LMArena Spanish | — | 1439 |

## Instruction Following

- Amazon Nova Experimental Chat 12 10: 73.2 (#123)
- Step 5 Preview: 76.0 (#50)

| Benchmark | Amazon Nova Experimental Chat 12 10 | Step 5 Preview |
|---|---|---|
| LMArena Instruction Following | 1387 | 1444 |

## Long Context

- Amazon Nova Experimental Chat 12 10: 42.4 (#125)
- Step 5 Preview: 44.5 (#64)

| Benchmark | Amazon Nova Experimental Chat 12 10 | Step 5 Preview |
|---|---|---|
| LMArena Longer Query | 1391 | 1455 |

## Writing & Preference

- Amazon Nova Experimental Chat 12 10: 59.5 (#110)
- Step 5 Preview: 62.8 (#71)

| Benchmark | Amazon Nova Experimental Chat 12 10 | Step 5 Preview |
|---|---|---|
| LMArena Text | 1420 | 1442 |
| LMArena Creative Writing | 1350 | 1410 |
| LMArena Multi-Turn | 1409 | 1447 |

## FAQ

### Is Amazon Nova Experimental Chat 12 10 better than Step 5 Preview?

Step 5 Preview is the stronger model overall, scoring 47.9 to 42.9 on the Noometry Index.

### Is Amazon Nova Experimental Chat 12 10 or Step 5 Preview better for coding?

Step 5 Preview scores higher on coding benchmarks: 51.8 versus 42.2 in the Noometry coding category.

### How many benchmarks do Amazon Nova Experimental Chat 12 10 and Step 5 Preview share?

12 benchmarks have published results for both models. Amazon Nova Experimental Chat 12 10 has 12 scored results on Noometry and Step 5 Preview has 18.