Model comparison
Grok 4.1 Fast vs Phi-2
Grok 4.1 Fast has enough public results to be ranked (#131); Phi-2 does not yet, so treat this comparison as directional.
Last verified . 0 shared benchmarks.
MicrosoftSummary
- Phi-2 has downloadable open weights; the other is API-only.
Side by side
| Grok 4.1 Fast | Phi-2 | |
|---|---|---|
| Provider | xAI | Microsoft |
| Noometry Index | 40.9 | — |
| Released | 2025-06-27 | 2023-12-12 |
| Weights | Proprietary | Open |
| Context window | 128K | — |
| Max output | 30K | — |
| Input $ / M tokens | $0.20 | — |
| Output $ / M tokens | $0.50 | — |
| Results tracked | 32 | 11 |
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Category by category
Coding Not comparable
Grok 4.1 Fast: 33.8 (#236), Phi-2: —
| Benchmark | Grok 4.1 Fast | Phi-2 |
|---|---|---|
| LMArena WebDev | 1241 | — |
| LMArena Coding | 1411 | — |
| ALE-Bench | 394.93 | — |
| HumanEval+ | — | 45.1% |
| MBPP+ | — | 54.2% |
Agentic & Tool Use Not comparable
Grok 4.1 Fast: 36.1 (#35), Phi-2: —
| Benchmark | Grok 4.1 Fast | Phi-2 |
|---|---|---|
| Berkeley Function Calling Leaderboard | 69.6% | — |
| τ²-bench Banking | 13.1% | — |
| LMArena Search | 1171 | — |
| Vending-Bench 2 | 1,107 | — |
Reasoning Not comparable
Grok 4.1 Fast: 42.3 (#45), Phi-2: —
| Benchmark | Grok 4.1 Fast | Phi-2 |
|---|---|---|
| SimpleBench | 56% | — |
| NYT Connections (extended) | 87.4% | — |
| LMArena Hard Prompts | 1407 | — |
| DTBench | 87.7% | — |
| Adversarial NLI | — | 42.5% |
| BIG-Bench Hard | — | 59.4% |
| Epoch Capabilities Index | — | 107.62 |
| ForecastBench | 61 | — |
| HellaSwag | — | 53.6% |
| WinoGrande | — | 54.7% |
Math Not comparable
Grok 4.1 Fast: 30.9 (#201), Phi-2: —
| Benchmark | Grok 4.1 Fast | Phi-2 |
|---|---|---|
| MathArena Final-Answer Competitions | 60.9% | — |
| ProofBench | 4% | — |
| LMArena Math | 1408 | — |
Knowledge Not comparable
Grok 4.1 Fast: 32.6 (#203), Phi-2: —
| Benchmark | Grok 4.1 Fast | Phi-2 |
|---|---|---|
| Vectara Hallucination Rate | 17.8% | — |
| LMArena Expert | 1398 | — |
| ARC (AI2) Challenge | — | 75.9% |
| MMLU | — | 58.4% |
| OpenBookQA | — | 73.6% |
| TriviaQA | — | 45.2% |
Multimodal Not comparable
Grok 4.1 Fast: 36.3 (#71), Phi-2: —
| Benchmark | Grok 4.1 Fast | Phi-2 |
|---|---|---|
| LMArena Vision | 1201 | — |
Multilingual Not comparable
Grok 4.1 Fast: 51.1 (#110), Phi-2: —
| Benchmark | Grok 4.1 Fast | Phi-2 |
|---|---|---|
| LMArena Non-English | 1391 | — |
| LMArena Chinese | 1441 | — |
| LMArena French | 1416 | — |
| LMArena German | 1404 | — |
| LMArena Japanese | 1347 | — |
| LMArena Korean | 1361 | — |
| LMArena Russian | 1387 | — |
| LMArena Spanish | 1411 | — |
Instruction Following Not comparable
Grok 4.1 Fast: 72.8 (#127), Phi-2: —
| Benchmark | Grok 4.1 Fast | Phi-2 |
|---|---|---|
| LMArena Instruction Following | 1376 | — |
Long Context Not comparable
Grok 4.1 Fast: 42.4 (#121), Phi-2: —
| Benchmark | Grok 4.1 Fast | Phi-2 |
|---|---|---|
| LMArena Longer Query | 1390 | — |
Writing & Preference Not comparable
Grok 4.1 Fast: 57.4 (#126), Phi-2: —
| Benchmark | Grok 4.1 Fast | Phi-2 |
|---|---|---|
| LMArena Text | 1408 | — |
| LMArena Creative Writing | 1394 | — |
| EQ-Bench Creative Writing | 1327 | — |
| LMArena Multi-Turn | 1389 | — |
Frequently asked questions
Is Grok 4.1 Fast better than Phi-2?
Grok 4.1 Fast has enough public results to be ranked (#131); Phi-2 does not yet, so treat this comparison as directional.
How many benchmarks do Grok 4.1 Fast and Phi-2 share?
0 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and Phi-2 has 11.