Model comparison
Grok 4.1 Fast vs Phi-4 Mini
Grok 4.1 Fast is the stronger model overall, scoring 40.9 to 30.4 on the Noometry Index. Phi-4 Mini costs 2.1× less per token, which makes it the better buy when Grok 4.1 Fast's lead doesn't matter for your workload.
Last verified . 1 shared benchmarks.
MicrosoftSummary
- They share 1 benchmark with published results for both. Grok 4.1 Fast scores higher in 3 categories and Phi-4 Mini in 0 categories; 3 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 42.3 to 21.7.
- The biggest single-benchmark swing is Vectara Hallucination Rate: 17.8% for Grok 4.1 Fast and 23.5% for Phi-4 Mini.
- Phi-4 Mini is cheaper at $0.075 / $0.30 per million input/output tokens, against $0.20 / $0.50 for Grok 4.1 Fast.
- Phi-4 Mini has downloadable open weights; the other is API-only.
Side by side
| Grok 4.1 Fast | Phi-4 Mini | |
|---|---|---|
| Provider | xAI | Microsoft |
| Noometry Index | 40.9 | 30.4 |
| Released | 2025-06-27 | 2024-12-11 |
| Weights | Proprietary | Open |
| Context window | 128K | 128K |
| Max output | 30K | 4K |
| Input $ / M tokens | $0.20 | $0.075 |
| Output $ / M tokens | $0.50 | $0.30 |
| Results tracked | 32 | 3 |
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Category by category
Coding Grok 4.1 Fast leads
Grok 4.1 Fast: 33.8 (#236), Phi-4 Mini: 27.6 (#312)
| Benchmark | Grok 4.1 Fast | Phi-4 Mini |
|---|---|---|
| LMArena WebDev | 1241 | — |
| SciCode | — | 10.8% |
| LMArena Coding | 1411 | — |
| ALE-Bench | 394.93 | — |
Agentic & Tool Use Not comparable
Grok 4.1 Fast: 36.1 (#35), Phi-4 Mini: —
| Benchmark | Grok 4.1 Fast | Phi-4 Mini |
|---|---|---|
| Berkeley Function Calling Leaderboard | 69.6% | — |
| τ²-bench Banking | 13.1% | — |
| LMArena Search | 1171 | — |
| Vending-Bench 2 | 1,107 | — |
Reasoning Grok 4.1 Fast leads
Grok 4.1 Fast: 42.3 (#45), Phi-4 Mini: 21.7 (#190)
| Benchmark | Grok 4.1 Fast | Phi-4 Mini |
|---|---|---|
| SimpleBench | 56% | — |
| NYT Connections (extended) | 87.4% | — |
| CritPt | — | 0% |
| LMArena Hard Prompts | 1407 | — |
| DTBench | 87.7% | — |
| ForecastBench | 61 | — |
Math Not comparable
Grok 4.1 Fast: 30.9 (#201), Phi-4 Mini: —
| Benchmark | Grok 4.1 Fast | Phi-4 Mini |
|---|---|---|
| MathArena Final-Answer Competitions | 60.9% | — |
| ProofBench | 4% | — |
| LMArena Math | 1408 | — |
Knowledge Grok 4.1 Fast leads
Grok 4.1 Fast: 32.6 (#203), Phi-4 Mini: 24.8 (#261)
| Benchmark | Grok 4.1 Fast | Phi-4 Mini |
|---|---|---|
| Vectara Hallucination Rate | 17.8% | 23.5% |
| LMArena Expert | 1398 | — |
Multimodal Not comparable
Grok 4.1 Fast: 36.3 (#71), Phi-4 Mini: —
| Benchmark | Grok 4.1 Fast | Phi-4 Mini |
|---|---|---|
| LMArena Vision | 1201 | — |
Multilingual Not comparable
Grok 4.1 Fast: 51.1 (#110), Phi-4 Mini: —
| Benchmark | Grok 4.1 Fast | Phi-4 Mini |
|---|---|---|
| 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-4 Mini: —
| Benchmark | Grok 4.1 Fast | Phi-4 Mini |
|---|---|---|
| LMArena Instruction Following | 1376 | — |
Long Context Not comparable
Grok 4.1 Fast: 42.4 (#121), Phi-4 Mini: —
| Benchmark | Grok 4.1 Fast | Phi-4 Mini |
|---|---|---|
| LMArena Longer Query | 1390 | — |
Writing & Preference Not comparable
Grok 4.1 Fast: 57.4 (#126), Phi-4 Mini: —
| Benchmark | Grok 4.1 Fast | Phi-4 Mini |
|---|---|---|
| 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-4 Mini?
Grok 4.1 Fast is the stronger model overall, scoring 40.9 to 30.4 on the Noometry Index. Phi-4 Mini costs 2.1× less per token, which makes it the better buy when Grok 4.1 Fast's lead doesn't matter for your workload.
Which is cheaper, Grok 4.1 Fast or Phi-4 Mini?
Phi-4 Mini is cheaper. It lists at $0.075 per million input tokens and $0.30 per million output tokens; Grok 4.1 Fast lists at $0.20 and $0.50.
Is Grok 4.1 Fast or Phi-4 Mini better for coding?
Grok 4.1 Fast scores higher on coding benchmarks: 33.8 versus 27.6 in the Noometry coding category.
Which has the bigger context window?
Both accept 128K tokens.
How many benchmarks do Grok 4.1 Fast and Phi-4 Mini share?
1 benchmark has published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and Phi-4 Mini has 3.