Model comparison
Amazon Nova Experimental Chat 12 10 vs Step 3.5 Flash
Amazon Nova Experimental Chat 12 10 and Step 3.5 Flash score almost the same on the Noometry Index (42.9 vs 42.3), so choose on price, context window or the category you care about most.
Last verified . 12 shared benchmarks.
StepFunSummary
- They share 12 benchmarks with published results for both. Amazon Nova Experimental Chat 12 10 scores higher in 4 categories and Step 3.5 Flash in 4 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Amazon Nova Experimental Chat 12 10 leads 29.3 to 22.2.
- Step 3.5 Flash has downloadable open weights; the other is API-only.
Side by side
| Amazon Nova Experimental Chat 12 10 | Step 3.5 Flash | |
|---|---|---|
| Provider | Amazon | StepFun |
| Noometry Index | 42.9 | 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 | 12 | 19 |
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Category by category
Coding Too close to call
Amazon Nova Experimental Chat 12 10: 42.2 (#110), Step 3.5 Flash: 42.4 (#105)
| Benchmark | Amazon Nova Experimental Chat 12 10 | Step 3.5 Flash |
|---|---|---|
| LMArena Coding | 1430 | 1436 |
Reasoning Amazon Nova Experimental Chat 12 10 leads
Amazon Nova Experimental Chat 12 10: 29.3 (#94), Step 3.5 Flash: 22.2 (#202)
| Benchmark | Amazon Nova Experimental Chat 12 10 | Step 3.5 Flash |
|---|---|---|
| LMArena Hard Prompts | 1427 | 1411 |
| NYT Connections (extended) | — | 28.4% |
Math Step 3.5 Flash leads
Amazon Nova Experimental Chat 12 10: 38.9 (#124), Step 3.5 Flash: 42.6 (#84)
| Benchmark | Amazon Nova Experimental Chat 12 10 | Step 3.5 Flash |
|---|---|---|
| LMArena Math | 1419 | 1408 |
| MathArena Final-Answer Competitions | — | 66.8% |
Knowledge Too close to call
Amazon Nova Experimental Chat 12 10: 39.2 (#136), Step 3.5 Flash: 39.6 (#132)
| Benchmark | Amazon Nova Experimental Chat 12 10 | Step 3.5 Flash |
|---|---|---|
| LMArena Expert | 1408 | 1421 |
Multilingual Too close to call
Amazon Nova Experimental Chat 12 10: 51.4 (#108), Step 3.5 Flash: 50.5 (#119)
| Benchmark | Amazon Nova Experimental Chat 12 10 | Step 3.5 Flash |
|---|---|---|
| LMArena Non-English | 1398 | 1385 |
| LMArena Chinese | 1440 | 1447 |
| LMArena Russian | 1395 | 1385 |
| LMArena French | — | 1421 |
| LMArena German | — | 1405 |
| LMArena Japanese | — | 1354 |
| LMArena Korean | — | 1352 |
| LMArena Spanish | — | 1419 |
Instruction Following Too close to call
Amazon Nova Experimental Chat 12 10: 73.2 (#123), Step 3.5 Flash: 73.1 (#124)
| Benchmark | Amazon Nova Experimental Chat 12 10 | Step 3.5 Flash |
|---|---|---|
| LMArena Instruction Following | 1387 | 1385 |
Long Context Too close to call
Amazon Nova Experimental Chat 12 10: 42.4 (#125), Step 3.5 Flash: 42.8 (#117)
| Benchmark | Amazon Nova Experimental Chat 12 10 | Step 3.5 Flash |
|---|---|---|
| LMArena Longer Query | 1391 | 1402 |
Writing & Preference Too close to call
Amazon Nova Experimental Chat 12 10: 59.5 (#110), Step 3.5 Flash: 58.8 (#113)
| Benchmark | Amazon Nova Experimental Chat 12 10 | Step 3.5 Flash |
|---|---|---|
| LMArena Text | 1420 | 1403 |
| LMArena Creative Writing | 1350 | 1357 |
| LMArena Multi-Turn | 1409 | 1405 |
Frequently asked questions
Is Amazon Nova Experimental Chat 12 10 better than Step 3.5 Flash?
Amazon Nova Experimental Chat 12 10 and Step 3.5 Flash score almost the same on the Noometry Index (42.9 vs 42.3), so choose on price, context window or the category you care about most.
Is Amazon Nova Experimental Chat 12 10 or Step 3.5 Flash better for coding?
They score almost the same on coding (42.2 vs 42.4); test both on your own repository before choosing.
How many benchmarks do Amazon Nova Experimental Chat 12 10 and Step 3.5 Flash share?
12 benchmarks have published results for both models. Amazon Nova Experimental Chat 12 10 has 12 scored results on Noometry and Step 3.5 Flash has 19.