Model comparison
Grok Build 0.1 vs Step 5 Preview
Step 5 Preview is the stronger model overall, scoring 47.9 to 36.4 on the Noometry Index.
Last verified . 2 shared benchmarks.
StepFunSummary
- They share 2 benchmarks with published results for both. Grok Build 0.1 scores higher in 0 categories and Step 5 Preview in 2 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in coding, where Step 5 Preview leads 51.8 to 43.1.
- The biggest single-benchmark swing is CritPt: 9.1% for Grok Build 0.1 and 20.9% for Step 5 Preview.
- Grok Build 0.1 is cheaper at $1 / $2 per million input/output tokens, against $1 / $2.70 for Step 5 Preview.
- Step 5 Preview accepts more context: 1.02M tokens versus 256K.
Side by side
| Grok Build 0.1 | Step 5 Preview | |
|---|---|---|
| Provider | xAI | StepFun |
| Noometry Index | 36.4 | 47.9 |
| Released | 2026-04-16 | 2026-09-16 |
| Weights | Proprietary | Proprietary |
| Context window | 256K | 1.02M |
| Max output | 256K | 66K |
| Input $ / M tokens | $1 | $1 |
| Output $ / M tokens | $2 | $2.70 |
| Results tracked | 3 | 18 |
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Category by category
Coding Step 5 Preview leads
Grok Build 0.1: 43.1 (#91), Step 5 Preview: 51.8 (#36)
| Benchmark | Grok Build 0.1 | Step 5 Preview |
|---|---|---|
| SciCode | 50.2% | 58.9% |
| LMArena WebDev | — | 1564 |
| LMArena Coding | — | 1480 |
Agentic & Tool Use Not comparable
Grok Build 0.1: 22.7 (#129), Step 5 Preview: —
| Benchmark | Grok Build 0.1 | Step 5 Preview |
|---|---|---|
| GBAEval | 2.4% | — |
Reasoning Step 5 Preview leads
Grok Build 0.1: 32.2 (#77), Step 5 Preview: 40.0 (#57)
| Benchmark | Grok Build 0.1 | Step 5 Preview |
|---|---|---|
| CritPt | 9.1% | 20.9% |
| LMArena Hard Prompts | — | 1465 |
Math Not comparable
Grok Build 0.1: —, Step 5 Preview: 46.1 (#72)
| Benchmark | Grok Build 0.1 | Step 5 Preview |
|---|---|---|
| ProofBench | — | 42% |
| LMArena Math | — | 1470 |
Knowledge Not comparable
Grok Build 0.1: —, Step 5 Preview: 41.2 (#112)
| Benchmark | Grok Build 0.1 | Step 5 Preview |
|---|---|---|
| LMArena Expert | — | 1470 |
Multimodal Not comparable
Grok Build 0.1: —, Step 5 Preview: 41.0 (#41)
| Benchmark | Grok Build 0.1 | Step 5 Preview |
|---|---|---|
| LMArena Vision | — | 1267 |
Multilingual Not comparable
Grok Build 0.1: —, Step 5 Preview: 53.8 (#54)
| Benchmark | Grok Build 0.1 | Step 5 Preview |
|---|---|---|
| LMArena Non-English | — | 1432 |
| LMArena Chinese | — | 1519 |
| LMArena Russian | — | 1436 |
| LMArena Spanish | — | 1439 |
Instruction Following Not comparable
Grok Build 0.1: —, Step 5 Preview: 76.0 (#50)
| Benchmark | Grok Build 0.1 | Step 5 Preview |
|---|---|---|
| LMArena Instruction Following | — | 1444 |
Long Context Not comparable
Grok Build 0.1: —, Step 5 Preview: 44.5 (#64)
| Benchmark | Grok Build 0.1 | Step 5 Preview |
|---|---|---|
| LMArena Longer Query | — | 1455 |
Writing & Preference Not comparable
Grok Build 0.1: —, Step 5 Preview: 62.8 (#71)
| Benchmark | Grok Build 0.1 | Step 5 Preview |
|---|---|---|
| LMArena Text | — | 1442 |
| LMArena Creative Writing | — | 1410 |
| LMArena Multi-Turn | — | 1447 |
Frequently asked questions
Is Grok Build 0.1 better than Step 5 Preview?
Step 5 Preview is the stronger model overall, scoring 47.9 to 36.4 on the Noometry Index.
Which is cheaper, Grok Build 0.1 or Step 5 Preview?
Grok Build 0.1 is cheaper. It lists at $1 per million input tokens and $2 per million output tokens; Step 5 Preview lists at $1 and $2.70.
Is Grok Build 0.1 or Step 5 Preview better for coding?
Step 5 Preview scores higher on coding benchmarks: 51.8 versus 43.1 in the Noometry coding category.
Which has the bigger context window?
Step 5 Preview does, with 1.02M tokens against 256K.
How many benchmarks do Grok Build 0.1 and Step 5 Preview share?
2 benchmarks have published results for both models. Grok Build 0.1 has 3 scored results on Noometry and Step 5 Preview has 18.