Model comparison
Grok 4 Fast vs phi-3-medium 14B
Grok 4 Fast is the stronger model overall, scoring 39.4 to 29.7 on the Noometry Index.
Last verified . 1 shared benchmarks.
MicrosoftSummary
- They share 1 benchmark with published results for both. Grok 4 Fast scores higher in 2 categories and phi-3-medium 14B in 1 category; 3 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Grok 4 Fast leads 32.0 to 9.1.
- phi-3-medium 14B has downloadable open weights; the other is API-only.
Side by side
| Grok 4 Fast | phi-3-medium 14B | |
|---|---|---|
| Provider | xAI | Microsoft |
| Noometry Index | 39.4 | 29.7 |
| Released | 2025-09-19 | 2024-04-23 |
| Weights | Proprietary | Open |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 30 | 13 |
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Category by category
Coding phi-3-medium 14B leads
Grok 4 Fast: 32.5 (#271), phi-3-medium 14B: 36.8 (#201)
| Benchmark | Grok 4 Fast | phi-3-medium 14B |
|---|---|---|
| LMArena WebDev | 1159 | — |
| WeirdML | 42.9% | — |
| BigCodeBench Instruct | — | 37.6% |
| LMArena Coding | 1429 | — |
| BigCodeBench Complete | — | 48.7% |
Agentic & Tool Use Not comparable
Grok 4 Fast: 29.5 (#86), phi-3-medium 14B: —
| Benchmark | Grok 4 Fast | phi-3-medium 14B |
|---|---|---|
| τ²-bench Banking | 15.7% | — |
| Cybench | 30% | — |
| LMArena Search | 1171 | — |
Reasoning Not comparable
Grok 4 Fast: 22.2 (#201), phi-3-medium 14B: —
| Benchmark | Grok 4 Fast | phi-3-medium 14B |
|---|---|---|
| Epoch Capabilities Index | 144.2 | 121.23 |
| ARC-AGI-2 | 5.3% | — |
| Kagi LLM Benchmark | 66.1% | — |
| ARC-AGI-1 | 48.5% | — |
| LMArena Hard Prompts | 1412 | — |
| DTBench | 82.7% | — |
| Adversarial NLI | — | 55.8% |
| BIG-Bench Hard | — | 81.4% |
| ForecastBench | 60.5 | — |
| HellaSwag | — | 82.4% |
| WinoGrande | — | 81.5% |
Math Grok 4 Fast leads
Grok 4 Fast: 38.9 (#123), phi-3-medium 14B: 27.3 (#250)
| Benchmark | Grok 4 Fast | phi-3-medium 14B |
|---|---|---|
| LMArena Math | 1419 | — |
| MATH Level 5 | — | 17.6% |
Knowledge Grok 4 Fast leads
Grok 4 Fast: 32.0 (#214), phi-3-medium 14B: 9.1 (#306)
| Benchmark | Grok 4 Fast | phi-3-medium 14B |
|---|---|---|
| GPQA Diamond | — | 27.6% |
| Vectara Hallucination Rate | 19.7% | — |
| LMArena Expert | 1411 | — |
| ARC (AI2) Challenge | — | 91.6% |
| MMLU | — | 78% |
| OpenBookQA | — | 87.4% |
| TriviaQA | — | 73.9% |
Multilingual Not comparable
Grok 4 Fast: 51.3 (#111), phi-3-medium 14B: —
| Benchmark | Grok 4 Fast | phi-3-medium 14B |
|---|---|---|
| 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), phi-3-medium 14B: —
| Benchmark | Grok 4 Fast | phi-3-medium 14B |
|---|---|---|
| LMArena Instruction Following | 1387 | — |
Long Context Not comparable
Grok 4 Fast: 63.2 (#3), phi-3-medium 14B: —
| Benchmark | Grok 4 Fast | phi-3-medium 14B |
|---|---|---|
| Fiction.LiveBench | 94.4% | — |
| LMArena Longer Query | 1415 | — |
Writing & Preference Not comparable
Grok 4 Fast: 60.0 (#102), phi-3-medium 14B: —
| Benchmark | Grok 4 Fast | phi-3-medium 14B |
|---|---|---|
| LMArena Text | 1407 | — |
| LMArena Creative Writing | 1387 | — |
| LMArena Multi-Turn | 1414 | — |
Frequently asked questions
Is Grok 4 Fast better than phi-3-medium 14B?
Grok 4 Fast is the stronger model overall, scoring 39.4 to 29.7 on the Noometry Index.
Is Grok 4 Fast or phi-3-medium 14B better for coding?
phi-3-medium 14B scores higher on coding benchmarks: 36.8 versus 32.5 in the Noometry coding category.
How many benchmarks do Grok 4 Fast and phi-3-medium 14B share?
1 benchmark has published results for both models. Grok 4 Fast has 30 scored results on Noometry and phi-3-medium 14B has 13.