Model comparison
Amazon Nova Pro vs Step 3.5 Flash
Step 3.5 Flash is the stronger model overall, scoring 42.3 to 31.0 on the Noometry Index.
Last verified . 17 shared benchmarks.
StepFunSummary
- They share 17 benchmarks with published results for both. Amazon Nova Pro scores higher in 0 categories and Step 3.5 Flash in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Step 3.5 Flash leads 58.8 to 43.9.
- Step 3.5 Flash is cheaper at $0.10 / $0.30 per million input/output tokens, against $0.80 / $3.20 for Amazon Nova Pro.
- Amazon Nova Pro accepts more context: 300K tokens versus 256K.
- Step 3.5 Flash has downloadable open weights; the other is API-only.
Side by side
| Amazon Nova Pro | Step 3.5 Flash | |
|---|---|---|
| Provider | Amazon | StepFun |
| Noometry Index | 31.0 | 42.3 |
| Released | 2024-12-03 | 2026-01-29 |
| Weights | Proprietary | Open |
| Context window | 300K | 256K |
| Max output | 10K | 256K |
| Input $ / M tokens | $0.80 | $0.10 |
| Output $ / M tokens | $3.20 | $0.30 |
| Results tracked | 38 | 19 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Step 3.5 Flash leads
Amazon Nova Pro: 35.1 (#229), Step 3.5 Flash: 42.4 (#105)
| Benchmark | Amazon Nova Pro | Step 3.5 Flash |
|---|---|---|
| LMArena Coding | 1270 | 1436 |
| LiveBench Coding | 38.1% | — |
Agentic & Tool Use Not comparable
Amazon Nova Pro: 16.7 (#147), Step 3.5 Flash: —
| Benchmark | Amazon Nova Pro | Step 3.5 Flash |
|---|---|---|
| Berkeley Function Calling Leaderboard | 25% | — |
| TheAgentCompany | 1.7% | — |
Reasoning Step 3.5 Flash leads
Amazon Nova Pro: 20.0 (#243), Step 3.5 Flash: 22.2 (#202)
| Benchmark | Amazon Nova Pro | Step 3.5 Flash |
|---|---|---|
| LMArena Hard Prompts | 1246 | 1411 |
| NYT Connections (extended) | — | 28.4% |
| LiveBench Reasoning | 32.6% | — |
| LiveBench Data Analysis | 48.3% | — |
| Epoch Capabilities Index | 123.8 | — |
| LiveBench | 43.5% | — |
Math Step 3.5 Flash leads
Amazon Nova Pro: 28.5 (#243), Step 3.5 Flash: 42.6 (#84)
| Benchmark | Amazon Nova Pro | Step 3.5 Flash |
|---|---|---|
| LMArena Math | 1252 | 1408 |
| MathArena Final-Answer Competitions | — | 66.8% |
| Omni-MATH | 24.2% | — |
| LiveBench Math | 38% | — |
Knowledge Step 3.5 Flash leads
Amazon Nova Pro: 27.4 (#250), Step 3.5 Flash: 39.6 (#132)
| Benchmark | Amazon Nova Pro | Step 3.5 Flash |
|---|---|---|
| LMArena Expert | 1211 | 1421 |
| Humanity's Last Exam | 4.4% | — |
| MMLU-Pro | 67.3% | — |
| Confabulations | 30.1% | — |
| Vectara Hallucination Rate | 5.1% | — |
| GPQA (HELM) | 44.6% | — |
| MMLU | 82% | — |
Multimodal Not comparable
Amazon Nova Pro: 25.0 (#126), Step 3.5 Flash: —
| Benchmark | Amazon Nova Pro | Step 3.5 Flash |
|---|---|---|
| LMArena Vision | 980 | — |
Multilingual Step 3.5 Flash leads
Amazon Nova Pro: 39.7 (#223), Step 3.5 Flash: 50.5 (#119)
| Benchmark | Amazon Nova Pro | Step 3.5 Flash |
|---|---|---|
| LMArena Non-English | 1234 | 1385 |
| LMArena Chinese | 1244 | 1447 |
| LMArena French | 1271 | 1421 |
| LMArena German | 1243 | 1405 |
| LMArena Japanese | 1200 | 1354 |
| LMArena Korean | 1203 | 1352 |
| LMArena Russian | 1240 | 1385 |
| LMArena Spanish | 1182 | 1419 |
Instruction Following Step 3.5 Flash leads
Amazon Nova Pro: 64.9 (#226), Step 3.5 Flash: 73.1 (#124)
| Benchmark | Amazon Nova Pro | Step 3.5 Flash |
|---|---|---|
| LMArena Instruction Following | 1235 | 1385 |
| LiveBench Instruction Following | 67.1% | — |
| IFEval | 81.5% | — |
Long Context Step 3.5 Flash leads
Amazon Nova Pro: 38.1 (#205), Step 3.5 Flash: 42.8 (#117)
| Benchmark | Amazon Nova Pro | Step 3.5 Flash |
|---|---|---|
| LMArena Longer Query | 1255 | 1402 |
Writing & Preference Step 3.5 Flash leads
Amazon Nova Pro: 43.9 (#226), Step 3.5 Flash: 58.8 (#113)
| Benchmark | Amazon Nova Pro | Step 3.5 Flash |
|---|---|---|
| LMArena Text | 1259 | 1403 |
| LMArena Creative Writing | 1212 | 1357 |
| LMArena Multi-Turn | 1246 | 1405 |
| Short-Story Creative Writing | 60.5% | — |
| WildBench | 77.7% | — |
| LiveBench Language | 37% | — |
Frequently asked questions
Is Amazon Nova Pro better than Step 3.5 Flash?
Step 3.5 Flash is the stronger model overall, scoring 42.3 to 31.0 on the Noometry Index.
Which is cheaper, Amazon Nova Pro or Step 3.5 Flash?
Step 3.5 Flash is cheaper. It lists at $0.10 per million input tokens and $0.30 per million output tokens; Amazon Nova Pro lists at $0.80 and $3.20.
Is Amazon Nova Pro or Step 3.5 Flash better for coding?
Step 3.5 Flash scores higher on coding benchmarks: 42.4 versus 35.1 in the Noometry coding category.
Which has the bigger context window?
Amazon Nova Pro does, with 300K tokens against 256K.
How many benchmarks do Amazon Nova Pro and Step 3.5 Flash share?
17 benchmarks have published results for both models. Amazon Nova Pro has 38 scored results on Noometry and Step 3.5 Flash has 19.