Model comparison
Grok 4 Fast vs StarCoder 2 15B
Grok 4 Fast has enough public results to be ranked (#164); StarCoder 2 15B does not yet, so treat this comparison as directional.
Last verified . 1 shared benchmarks.
NVIDIASummary
- They share 1 benchmark with published results for both. Grok 4 Fast scores higher in 0 categories and StarCoder 2 15B in 1 category; one gap is clear of the uncertainty.
- The widest gap is in coding, where StarCoder 2 15B leads 36.0 to 32.3.
- StarCoder 2 15B has downloadable open weights; the other is API-only.
Side by side
| Grok 4 Fast | StarCoder 2 15B | |
|---|---|---|
| Provider | xAI | NVIDIA |
| Noometry Index | 39.0 | 37.5 |
| Released | 2025-09-19 | 2024-02-20 |
| Weights | Proprietary | Open |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 30 | 7 |
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Category by category
Coding StarCoder 2 15B leads
Grok 4 Fast: 32.3 (#264), StarCoder 2 15B: 36.0
| Benchmark | Grok 4 Fast | StarCoder 2 15B |
|---|---|---|
| LMArena WebDev | 1160 | — |
| WeirdML | 42.9% | — |
| LMArena Coding | 1429 | — |
| BigCodeBench Complete | — | 38.4% |
| HumanEval+ | — | 37.8% |
Agentic & Tool Use Not comparable
Grok 4 Fast: 29.3 (#80), StarCoder 2 15B: —
| Benchmark | Grok 4 Fast | StarCoder 2 15B |
|---|---|---|
| τ²-bench Banking | 15.7% | — |
| Cybench | 30% | — |
| LMArena Search | 1171 | — |
Reasoning Not comparable
Grok 4 Fast: 22.5 (#179), StarCoder 2 15B: —
| Benchmark | Grok 4 Fast | StarCoder 2 15B |
|---|---|---|
| Epoch Capabilities Index | 144.21 | 104.61 |
| ARC-AGI-2 | 5.3% | — |
| Kagi LLM Benchmark | 66.1% | — |
| ARC-AGI-1 | 48.5% | — |
| LMArena Hard Prompts | 1413 | — |
| DTBench | 82.7% | — |
| ForecastBench | 60.5 | — |
| WinoGrande | — | 64.3% |
Math Not comparable
Grok 4 Fast: 36.1 (#126), StarCoder 2 15B: —
| Benchmark | Grok 4 Fast | StarCoder 2 15B |
|---|---|---|
| LMArena Math | 1419 | — |
| GSM8K | — | 57.7% |
Knowledge Not comparable
Grok 4 Fast: 31.5 (#211), StarCoder 2 15B: —
| Benchmark | Grok 4 Fast | StarCoder 2 15B |
|---|---|---|
| Vectara Hallucination Rate | 19.7% | — |
| LMArena Expert | 1411 | — |
| ARC (AI2) Challenge | — | 47.2% |
| MMLU | — | 64.1% |
Multilingual Not comparable
Grok 4 Fast: 51.5 (#106), StarCoder 2 15B: —
| Benchmark | Grok 4 Fast | StarCoder 2 15B |
|---|---|---|
| LMArena Non-English | 1397 | — |
| LMArena Chinese | 1458 | — |
| LMArena French | 1433 | — |
| LMArena German | 1383 | — |
| LMArena Japanese | 1358 | — |
| LMArena Korean | 1359 | — |
| LMArena Russian | 1387 | — |
| LMArena Spanish | 1414 | — |
Instruction Following Not comparable
Grok 4 Fast: 73.4 (#116), StarCoder 2 15B: —
| Benchmark | Grok 4 Fast | StarCoder 2 15B |
|---|---|---|
| LMArena Instruction Following | 1388 | — |
Long Context Not comparable
Grok 4 Fast: 63.2 (#3), StarCoder 2 15B: —
| Benchmark | Grok 4 Fast | StarCoder 2 15B |
|---|---|---|
| Fiction.LiveBench | 94.4% | — |
| LMArena Longer Query | 1415 | — |
Writing & Preference Not comparable
Grok 4 Fast: 60.2 (#96), StarCoder 2 15B: —
| Benchmark | Grok 4 Fast | StarCoder 2 15B |
|---|---|---|
| LMArena Text | 1407 | — |
| LMArena Creative Writing | 1388 | — |
| LMArena Multi-Turn | 1414 | — |
Frequently asked questions
Is Grok 4 Fast better than StarCoder 2 15B?
Grok 4 Fast has enough public results to be ranked (#164); StarCoder 2 15B does not yet, so treat this comparison as directional.
Is Grok 4 Fast or StarCoder 2 15B better for coding?
StarCoder 2 15B scores higher on coding benchmarks: 36.0 versus 32.3 in the Noometry coding category.
How many benchmarks do Grok 4 Fast and StarCoder 2 15B share?
1 benchmark has published results for both models. Grok 4 Fast has 30 scored results on Noometry and StarCoder 2 15B has 7.