Model comparison
Llama 4 Scout vs Step 3.5 Flash
Step 3.5 Flash is the stronger model overall, scoring 42.3 to 27.7 on the Noometry Index.
Last verified . 17 shared benchmarks.
Meta
StepFunSummary
- They share 17 benchmarks with published results for both. Llama 4 Scout 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 math, where Step 3.5 Flash leads 42.6 to 19.6.
- Both cost about the same: $0.10 input and $0.30 output per million tokens.
- Step 3.5 Flash accepts more context: 256K tokens versus 128K.
Side by side
| Llama 4 Scout | Step 3.5 Flash | |
|---|---|---|
| Provider | Meta | StepFun |
| Noometry Index | 27.7 | 42.3 |
| Released | 2025-04-05 | 2026-01-29 |
| Weights | Open | Open |
| Context window | 128K | 256K |
| Max output | 4K | 256K |
| Input $ / M tokens | $0.10 | $0.10 |
| Output $ / M tokens | $0.30 | $0.30 |
| Results tracked | 43 | 19 |
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Category by category
Coding Step 3.5 Flash leads
Llama 4 Scout: 20.2 (#339), Step 3.5 Flash: 42.4 (#105)
| Benchmark | Llama 4 Scout | Step 3.5 Flash |
|---|---|---|
| LMArena Coding | 1286 | 1436 |
| SWE-bench Verified (bash only) | 9.1% | — |
| SciCode | 17% | — |
| BigCodeBench Complete | 43.1% | — |
Agentic & Tool Use Not comparable
Llama 4 Scout: 24.6 (#119), Step 3.5 Flash: —
| Benchmark | Llama 4 Scout | Step 3.5 Flash |
|---|---|---|
| Berkeley Function Calling Leaderboard | 28.1% | — |
Reasoning Step 3.5 Flash leads
Llama 4 Scout: 9.1 (#345), Step 3.5 Flash: 22.2 (#202)
| Benchmark | Llama 4 Scout | Step 3.5 Flash |
|---|---|---|
| LMArena Hard Prompts | 1266 | 1411 |
| ARC-AGI-2 | 0% | — |
| Kagi LLM Benchmark | 36.9% | — |
| NYT Connections (extended) | — | 28.4% |
| ARC-AGI-1 | 0.5% | — |
| CritPt | 0% | — |
| DTBench | 57.9% | — |
| LMCA | 12% | — |
| Epoch Capabilities Index | 129.64 | — |
| ForecastBench | 57.5 | — |
Math Step 3.5 Flash leads
Llama 4 Scout: 19.6 (#286), Step 3.5 Flash: 42.6 (#84)
| Benchmark | Llama 4 Scout | Step 3.5 Flash |
|---|---|---|
| LMArena Math | 1287 | 1408 |
| MathArena Final-Answer Competitions | — | 66.8% |
| OTIS Mock AIME 2024-2025 | 7.8% | — |
| Omni-MATH | 37.3% | — |
| MATH Level 5 | 62.3% | — |
| FrontierMath (Feb 2025 set) | 0% | — |
Knowledge Step 3.5 Flash leads
Llama 4 Scout: 31.9 (#217), Step 3.5 Flash: 39.6 (#132)
| Benchmark | Llama 4 Scout | Step 3.5 Flash |
|---|---|---|
| LMArena Expert | 1235 | 1421 |
| GPQA Diamond | 51.8% | — |
| MMLU-Pro | 74.2% | — |
| Vectara Hallucination Rate | 7.7% | — |
| GPQA (HELM) | 50.7% | — |
Multimodal Not comparable
Llama 4 Scout: 32.2 (#102), Step 3.5 Flash: —
| Benchmark | Llama 4 Scout | Step 3.5 Flash |
|---|---|---|
| LMArena Vision | 1118 | — |
| SpatialViz-Bench | 34.2% | — |
Multilingual Step 3.5 Flash leads
Llama 4 Scout: 41.0 (#212), Step 3.5 Flash: 50.5 (#119)
| Benchmark | Llama 4 Scout | Step 3.5 Flash |
|---|---|---|
| LMArena Non-English | 1252 | 1385 |
| LMArena Chinese | 1255 | 1447 |
| LMArena French | 1282 | 1421 |
| LMArena German | 1272 | 1405 |
| LMArena Japanese | 1206 | 1354 |
| LMArena Korean | 1207 | 1352 |
| LMArena Russian | 1263 | 1385 |
| LMArena Spanish | 1278 | 1419 |
Instruction Following Step 3.5 Flash leads
Llama 4 Scout: 65.8 (#217), Step 3.5 Flash: 73.1 (#124)
| Benchmark | Llama 4 Scout | Step 3.5 Flash |
|---|---|---|
| LMArena Instruction Following | 1248 | 1385 |
| IFEval | 81.8% | — |
Long Context Step 3.5 Flash leads
Llama 4 Scout: 27.5 (#294), Step 3.5 Flash: 42.8 (#117)
| Benchmark | Llama 4 Scout | Step 3.5 Flash |
|---|---|---|
| LMArena Longer Query | 1265 | 1402 |
| Fiction.LiveBench | 36% | — |
Writing & Preference Step 3.5 Flash leads
Llama 4 Scout: 37.0 (#261), Step 3.5 Flash: 58.8 (#113)
| Benchmark | Llama 4 Scout | Step 3.5 Flash |
|---|---|---|
| LMArena Text | 1279 | 1403 |
| LMArena Creative Writing | 1249 | 1357 |
| LMArena Multi-Turn | 1280 | 1405 |
| EQ-Bench Creative Writing | 783 | — |
| WildBench | 78% | — |
Frequently asked questions
Is Llama 4 Scout better than Step 3.5 Flash?
Step 3.5 Flash is the stronger model overall, scoring 42.3 to 27.7 on the Noometry Index.
Which is cheaper, Llama 4 Scout 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; Llama 4 Scout lists at $0.10 and $0.30.
Is Llama 4 Scout or Step 3.5 Flash better for coding?
Step 3.5 Flash scores higher on coding benchmarks: 42.4 versus 20.2 in the Noometry coding category.
Which has the bigger context window?
Step 3.5 Flash does, with 256K tokens against 128K.
How many benchmarks do Llama 4 Scout and Step 3.5 Flash share?
17 benchmarks have published results for both models. Llama 4 Scout has 43 scored results on Noometry and Step 3.5 Flash has 19.