Model comparison
Grok 4 Fast vs Step 3.7 Flash
Grok 4 Fast is the stronger model overall, scoring 39.4 to 37.3 on the Noometry Index.
Last verified . 0 shared benchmarks.
StepFunSummary
- The widest gap is in coding, where Step 3.7 Flash leads 40.0 to 32.5.
- Step 3.7 Flash has downloadable open weights; the other is API-only.
Side by side
| Grok 4 Fast | Step 3.7 Flash | |
|---|---|---|
| Provider | xAI | StepFun |
| Noometry Index | 39.4 | 37.3 |
| Released | 2025-09-19 | 2026-05-29 |
| Weights | Proprietary | Open |
| Context window | — | 256K |
| Max output | — | 256K |
| Input $ / M tokens | — | $0.18 |
| Output $ / M tokens | — | $1.11 |
| Results tracked | 30 | 5 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Step 3.7 Flash leads
Grok 4 Fast: 32.5 (#271), Step 3.7 Flash: 40.0 (#150)
| Benchmark | Grok 4 Fast | Step 3.7 Flash |
|---|---|---|
| LMArena WebDev | 1159 | — |
| SciCode | — | 40% |
| WeirdML | 42.9% | — |
| LMArena Coding | 1429 | — |
| ALE-Bench | — | 694.12 |
Agentic & Tool Use Not comparable
Grok 4 Fast: 29.5 (#86), Step 3.7 Flash: —
| Benchmark | Grok 4 Fast | Step 3.7 Flash |
|---|---|---|
| τ²-bench Banking | 15.7% | — |
| Cybench | 30% | — |
| LMArena Search | 1171 | — |
Reasoning Too close to call
Grok 4 Fast: 22.2 (#201), Step 3.7 Flash: 21.6 (#219)
| Benchmark | Grok 4 Fast | Step 3.7 Flash |
|---|---|---|
| ARC-AGI-2 | 5.3% | — |
| Kagi LLM Benchmark | 66.1% | — |
| NYT Connections (extended) | — | 39.7% |
| ARC-AGI-1 | 48.5% | — |
| CritPt | — | 2.3% |
| LMArena Hard Prompts | 1412 | — |
| DTBench | 82.7% | — |
| Epoch Capabilities Index | 144.2 | — |
| ForecastBench | 60.5 | — |
Math Step 3.7 Flash leads
Grok 4 Fast: 38.9 (#123), Step 3.7 Flash: 42.9 (#82)
| Benchmark | Grok 4 Fast | Step 3.7 Flash |
|---|---|---|
| MathArena Final-Answer Competitions | — | 68.5% |
| LMArena Math | 1419 | — |
Knowledge Not comparable
Grok 4 Fast: 32.0 (#214), Step 3.7 Flash: —
| Benchmark | Grok 4 Fast | Step 3.7 Flash |
|---|---|---|
| Vectara Hallucination Rate | 19.7% | — |
| LMArena Expert | 1411 | — |
Multilingual Not comparable
Grok 4 Fast: 51.3 (#111), Step 3.7 Flash: —
| Benchmark | Grok 4 Fast | Step 3.7 Flash |
|---|---|---|
| LMArena Non-English | 1396 | — |
| LMArena Chinese | 1457 | — |
| LMArena French | 1431 | — |
| LMArena German | 1383 | — |
| LMArena Japanese | 1352 | — |
| LMArena Korean | 1357 | — |
| LMArena Russian | 1389 | — |
| LMArena Spanish | 1415 | — |
Instruction Following Not comparable
Grok 4 Fast: 73.2 (#121), Step 3.7 Flash: —
| Benchmark | Grok 4 Fast | Step 3.7 Flash |
|---|---|---|
| LMArena Instruction Following | 1387 | — |
Long Context Not comparable
Grok 4 Fast: 63.2 (#3), Step 3.7 Flash: —
| Benchmark | Grok 4 Fast | Step 3.7 Flash |
|---|---|---|
| Fiction.LiveBench | 94.4% | — |
| LMArena Longer Query | 1415 | — |
Writing & Preference Not comparable
Grok 4 Fast: 60.0 (#102), Step 3.7 Flash: —
| Benchmark | Grok 4 Fast | Step 3.7 Flash |
|---|---|---|
| LMArena Text | 1407 | — |
| LMArena Creative Writing | 1387 | — |
| LMArena Multi-Turn | 1414 | — |
Frequently asked questions
Is Grok 4 Fast better than Step 3.7 Flash?
Grok 4 Fast is the stronger model overall, scoring 39.4 to 37.3 on the Noometry Index.
Is Grok 4 Fast or Step 3.7 Flash better for coding?
Step 3.7 Flash scores higher on coding benchmarks: 40.0 versus 32.5 in the Noometry coding category.
How many benchmarks do Grok 4 Fast and Step 3.7 Flash share?
0 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Step 3.7 Flash has 5.