Model comparison
Grok 4 Fast vs Phi 3 Small 8k Instruct
Grok 4 Fast is the stronger model overall, scoring 39.0 to 28.8 on the Noometry Index.
Last verified . 17 shared benchmarks.
MicrosoftSummary
- They share 17 benchmarks with published results for both. Grok 4 Fast scores higher in 8 categories and Phi 3 Small 8k Instruct in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 33.0.
- Phi 3 Small 8k Instruct has downloadable open weights; the other is API-only.
Side by side
| Grok 4 Fast | Phi 3 Small 8k Instruct | |
|---|---|---|
| Provider | xAI | Microsoft |
| Noometry Index | 39.0 | 28.8 |
| Released | 2025-09-19 | 2024-04-23 |
| Weights | Proprietary | Open |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 30 | 32 |
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Category by category
Coding Grok 4 Fast leads
Grok 4 Fast: 32.3 (#264), Phi 3 Small 8k Instruct: 27.4 (#313)
| Benchmark | Grok 4 Fast | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Coding | 1429 | 1102 |
| LMArena WebDev | 1160 | — |
| WeirdML | 42.9% | — |
| LiveBench Coding | — | 20.3% |
Agentic & Tool Use Not comparable
Grok 4 Fast: 29.3 (#80), Phi 3 Small 8k Instruct: —
| Benchmark | Grok 4 Fast | Phi 3 Small 8k Instruct |
|---|---|---|
| τ²-bench Banking | 15.7% | — |
| Cybench | 30% | — |
| LMArena Search | 1171 | — |
Reasoning Grok 4 Fast leads
Grok 4 Fast: 22.5 (#179), Phi 3 Small 8k Instruct: 14.2 (#319)
| Benchmark | Grok 4 Fast | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Hard Prompts | 1413 | 1100 |
| ARC-AGI-2 | 5.3% | — |
| Kagi LLM Benchmark | 66.1% | — |
| ARC-AGI-1 | 48.5% | — |
| LiveBench Reasoning | — | 15.9% |
| DTBench | 82.7% | — |
| LiveBench Data Analysis | — | 30.3% |
| Adversarial NLI | — | 58.1% |
| BIG-Bench Hard | — | 79.1% |
| Epoch Capabilities Index | 144.21 | — |
| ForecastBench | 60.5 | — |
| HellaSwag | — | 77% |
| LiveBench | — | 24% |
| WinoGrande | — | 81.5% |
Math Grok 4 Fast leads
Grok 4 Fast: 36.1 (#126), Phi 3 Small 8k Instruct: 25.4 (#247)
| Benchmark | Grok 4 Fast | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Math | 1419 | 1151 |
| LiveBench Math | — | 17.6% |
Knowledge Grok 4 Fast leads
Grok 4 Fast: 31.5 (#211), Phi 3 Small 8k Instruct: 28.5 (#237)
| Benchmark | Grok 4 Fast | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Expert | 1411 | 1067 |
| Vectara Hallucination Rate | 19.7% | — |
| ARC (AI2) Challenge | — | 90.7% |
| MMLU | — | 75.7% |
| OpenBookQA | — | 88% |
| TriviaQA | — | 58.1% |
Multilingual Grok 4 Fast leads
Grok 4 Fast: 51.5 (#106), Phi 3 Small 8k Instruct: 28.6 (#267)
| Benchmark | Grok 4 Fast | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Non-English | 1397 | 1058 |
| LMArena Chinese | 1458 | 1061 |
| LMArena French | 1433 | 1134 |
| LMArena German | 1383 | 1080 |
| LMArena Japanese | 1358 | 966 |
| LMArena Korean | 1359 | 894 |
| LMArena Russian | 1387 | 1111 |
| LMArena Spanish | 1414 | 1111 |
Instruction Following Grok 4 Fast leads
Grok 4 Fast: 73.4 (#116), Phi 3 Small 8k Instruct: 52.2 (#287)
| Benchmark | Grok 4 Fast | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Instruction Following | 1388 | 1087 |
| LiveBench Instruction Following | — | 47.2% |
Long Context Grok 4 Fast leads
Grok 4 Fast: 63.2 (#3), Phi 3 Small 8k Instruct: 33.0 (#262)
| Benchmark | Grok 4 Fast | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Longer Query | 1415 | 1088 |
| Fiction.LiveBench | 94.4% | — |
Writing & Preference Grok 4 Fast leads
Grok 4 Fast: 60.2 (#96), Phi 3 Small 8k Instruct: 31.3 (#279)
| Benchmark | Grok 4 Fast | Phi 3 Small 8k Instruct |
|---|---|---|
| LMArena Text | 1407 | 1110 |
| LMArena Creative Writing | 1388 | 1083 |
| LMArena Multi-Turn | 1414 | 1068 |
| LiveBench Language | — | 12.9% |
Frequently asked questions
Is Grok 4 Fast better than Phi 3 Small 8k Instruct?
Grok 4 Fast is the stronger model overall, scoring 39.0 to 28.8 on the Noometry Index.
Is Grok 4 Fast or Phi 3 Small 8k Instruct better for coding?
Grok 4 Fast scores higher on coding benchmarks: 32.3 versus 27.4 in the Noometry coding category.
How many benchmarks do Grok 4 Fast and Phi 3 Small 8k Instruct share?
17 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Phi 3 Small 8k Instruct has 32.