# Amazon Nova Experimental Chat 10 20 vs Step 3.5 Flash

> Amazon Nova Experimental Chat 10 20 and Step 3.5 Flash score almost the same on the Noometry Index (41.5 vs 41.7), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/amazon-nova-experimental-chat-10-20-vs-step-3-5-flash
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Amazon Nova Experimental Chat 10 20 scores higher in 1 category and Step 3.5 Flash in 7 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Amazon Nova Experimental Chat 10 20 leads 27.3 to 21.2.
- Step 3.5 Flash has downloadable open weights; the other is API-only.

## Snapshot

| | Amazon Nova Experimental Chat 10 20 | Step 3.5 Flash |
|---|---|---|
| Provider | Amazon | StepFun |
| Noometry Index | 41.5 | 41.7 |
| Rank | 122 | 116 |
| Context | — | 256K |
| Input $/M | — | $0.10 |
| Output $/M | — | $0.30 |
| Weights | Proprietary | Open |

## Coding

- Amazon Nova Experimental Chat 10 20: 41.0 (#123)
- Step 3.5 Flash: 41.7 (#106)

| Benchmark | Amazon Nova Experimental Chat 10 20 | Step 3.5 Flash |
|---|---|---|
| LMArena Coding | 1413 | 1436 |

## Reasoning

- Amazon Nova Experimental Chat 10 20: 27.3 (#110)
- Step 3.5 Flash: 21.2 (#202)

| Benchmark | Amazon Nova Experimental Chat 10 20 | Step 3.5 Flash |
|---|---|---|
| LMArena Hard Prompts | 1396 | 1411 |
| NYT Connections (extended) | — | 28.4% |

## Math

- Amazon Nova Experimental Chat 10 20: 36.2 (#121)
- Step 3.5 Flash: 40.6 (#77)

| Benchmark | Amazon Nova Experimental Chat 10 20 | Step 3.5 Flash |
|---|---|---|
| LMArena Math | 1425 | 1408 |
| MathArena Final-Answer Competitions | — | 66.8% |

## Knowledge

- Amazon Nova Experimental Chat 10 20: 37.8 (#142)
- Step 3.5 Flash: 39.0 (#127)

| Benchmark | Amazon Nova Experimental Chat 10 20 | Step 3.5 Flash |
|---|---|---|
| LMArena Expert | 1385 | 1422 |

## Multilingual

- Amazon Nova Experimental Chat 10 20: 49.7 (#127)
- Step 3.5 Flash: 50.7 (#115)

| Benchmark | Amazon Nova Experimental Chat 10 20 | Step 3.5 Flash |
|---|---|---|
| LMArena Non-English | 1372 | 1386 |
| LMArena Chinese | 1405 | 1448 |
| LMArena French | 1426 | 1421 |
| LMArena German | 1391 | 1404 |
| LMArena Japanese | 1355 | 1353 |
| LMArena Korean | 1327 | 1350 |
| LMArena Russian | 1371 | 1385 |
| LMArena Spanish | 1381 | 1419 |

## Instruction Following

- Amazon Nova Experimental Chat 10 20: 72.3 (#136)
- Step 3.5 Flash: 73.3 (#119)

| Benchmark | Amazon Nova Experimental Chat 10 20 | Step 3.5 Flash |
|---|---|---|
| LMArena Instruction Following | 1365 | 1385 |

## Long Context

- Amazon Nova Experimental Chat 10 20: 41.7 (#128)
- Step 3.5 Flash: 42.8 (#112)

| Benchmark | Amazon Nova Experimental Chat 10 20 | Step 3.5 Flash |
|---|---|---|
| LMArena Longer Query | 1370 | 1402 |

## Writing & Preference

- Amazon Nova Experimental Chat 10 20: 56.9 (#131)
- Step 3.5 Flash: 59.0 (#108)

| Benchmark | Amazon Nova Experimental Chat 10 20 | Step 3.5 Flash |
|---|---|---|
| LMArena Text | 1394 | 1403 |
| LMArena Creative Writing | 1318 | 1357 |
| LMArena Multi-Turn | 1364 | 1405 |

## FAQ

### Is Amazon Nova Experimental Chat 10 20 better than Step 3.5 Flash?

Amazon Nova Experimental Chat 10 20 and Step 3.5 Flash score almost the same on the Noometry Index (41.5 vs 41.7), so choose on price, context window or the category you care about most.

### Is Amazon Nova Experimental Chat 10 20 or Step 3.5 Flash better for coding?

They score almost the same on coding (41.0 vs 41.7); test both on your own repository before choosing.

### How many benchmarks do Amazon Nova Experimental Chat 10 20 and Step 3.5 Flash share?

17 benchmarks have published results for both models. Amazon Nova Experimental Chat 10 20 has 17 scored results on Noometry and Step 3.5 Flash has 19.