Model comparison
Amazon Nova Experimental Chat 10 09 vs Step 3.5 Flash
Amazon Nova Experimental Chat 10 09 and Step 3.5 Flash score almost the same on the Noometry Index (41.9 vs 42.3), so choose on price, context window or the category you care about most.
Last verified . 9 shared benchmarks.
StepFunSummary
- They share 9 benchmarks with published results for both. Amazon Nova Experimental Chat 10 09 scores higher in 1 category and Step 3.5 Flash in 5 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Amazon Nova Experimental Chat 10 09 leads 27.3 to 22.2.
- Step 3.5 Flash has downloadable open weights; the other is API-only.
Side by side
| Amazon Nova Experimental Chat 10 09 | Step 3.5 Flash | |
|---|---|---|
| Provider | Amazon | StepFun |
| Noometry Index | 41.9 | 42.3 |
| Released | — | 2026-01-29 |
| Weights | Proprietary | Open |
| Context window | — | 256K |
| Max output | — | 256K |
| Input $ / M tokens | — | $0.10 |
| Output $ / M tokens | — | $0.30 |
| Results tracked | 9 | 19 |
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Category by category
Coding Step 3.5 Flash leads
Amazon Nova Experimental Chat 10 09: 40.2 (#145), Step 3.5 Flash: 42.4 (#105)
| Benchmark | Amazon Nova Experimental Chat 10 09 | Step 3.5 Flash |
|---|---|---|
| LMArena Coding | 1370 | 1436 |
Reasoning Amazon Nova Experimental Chat 10 09 leads
Amazon Nova Experimental Chat 10 09: 27.3 (#120), Step 3.5 Flash: 22.2 (#202)
| Benchmark | Amazon Nova Experimental Chat 10 09 | Step 3.5 Flash |
|---|---|---|
| LMArena Hard Prompts | 1356 | 1411 |
| NYT Connections (extended) | — | 28.4% |
Math Not comparable
Amazon Nova Experimental Chat 10 09: —, Step 3.5 Flash: 42.6 (#84)
| Benchmark | Amazon Nova Experimental Chat 10 09 | Step 3.5 Flash |
|---|---|---|
| MathArena Final-Answer Competitions | — | 66.8% |
| LMArena Math | — | 1408 |
Knowledge Not comparable
Amazon Nova Experimental Chat 10 09: —, Step 3.5 Flash: 39.6 (#132)
| Benchmark | Amazon Nova Experimental Chat 10 09 | Step 3.5 Flash |
|---|---|---|
| LMArena Expert | — | 1421 |
Multilingual Step 3.5 Flash leads
Amazon Nova Experimental Chat 10 09: 47.3 (#150), Step 3.5 Flash: 50.5 (#119)
| Benchmark | Amazon Nova Experimental Chat 10 09 | Step 3.5 Flash |
|---|---|---|
| LMArena Non-English | 1340 | 1385 |
| LMArena Chinese | 1341 | 1447 |
| LMArena French | — | 1421 |
| LMArena German | — | 1405 |
| LMArena Japanese | — | 1354 |
| LMArena Korean | — | 1352 |
| LMArena Russian | — | 1385 |
| LMArena Spanish | — | 1419 |
Instruction Following Step 3.5 Flash leads
Amazon Nova Experimental Chat 10 09: 69.4 (#172), Step 3.5 Flash: 73.1 (#124)
| Benchmark | Amazon Nova Experimental Chat 10 09 | Step 3.5 Flash |
|---|---|---|
| LMArena Instruction Following | 1315 | 1385 |
Long Context Step 3.5 Flash leads
Amazon Nova Experimental Chat 10 09: 40.5 (#152), Step 3.5 Flash: 42.8 (#117)
| Benchmark | Amazon Nova Experimental Chat 10 09 | Step 3.5 Flash |
|---|---|---|
| LMArena Longer Query | 1333 | 1402 |
Writing & Preference Step 3.5 Flash leads
Amazon Nova Experimental Chat 10 09: 54.7 (#149), Step 3.5 Flash: 58.8 (#113)
| Benchmark | Amazon Nova Experimental Chat 10 09 | Step 3.5 Flash |
|---|---|---|
| LMArena Text | 1364 | 1403 |
| LMArena Creative Writing | 1307 | 1357 |
| LMArena Multi-Turn | 1355 | 1405 |
Frequently asked questions
Is Amazon Nova Experimental Chat 10 09 better than Step 3.5 Flash?
Amazon Nova Experimental Chat 10 09 and Step 3.5 Flash score almost the same on the Noometry Index (41.9 vs 42.3), so choose on price, context window or the category you care about most.
Is Amazon Nova Experimental Chat 10 09 or Step 3.5 Flash better for coding?
Step 3.5 Flash scores higher on coding benchmarks: 42.4 versus 40.2 in the Noometry coding category.
How many benchmarks do Amazon Nova Experimental Chat 10 09 and Step 3.5 Flash share?
9 benchmarks have published results for both models. Amazon Nova Experimental Chat 10 09 has 9 scored results on Noometry and Step 3.5 Flash has 19.