Model comparison
GPT-4.1 mini vs Grok 4.1 Fast
Grok 4.1 Fast is the stronger model overall, scoring 40.9 to 33.5 on the Noometry Index.
Last verified . 21 shared benchmarks.
Summary
- They share 21 benchmarks with published results for both. GPT-4.1 mini scores higher in 2 categories and Grok 4.1 Fast in 8 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 42.3 to 10.9.
- The biggest single-benchmark swing is Berkeley Function Calling Leaderboard: 50.5% for GPT-4.1 mini and 69.6% for Grok 4.1 Fast.
- Grok 4.1 Fast is cheaper at $0.20 / $0.50 per million input/output tokens, against $0.40 / $1.60 for GPT-4.1 mini.
- GPT-4.1 mini accepts more context: 1.05M tokens versus 128K.
Side by side
| GPT-4.1 mini | Grok 4.1 Fast | |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 33.5 | 40.9 |
| Released | 2025-04-14 | 2025-06-27 |
| Weights | Proprietary | Proprietary |
| Context window | 1.05M | 128K |
| Max output | 33K | 30K |
| Input $ / M tokens | $0.40 | $0.20 |
| Output $ / M tokens | $1.60 | $0.50 |
| Results tracked | 47 | 32 |
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Category by category
Coding Grok 4.1 Fast leads
GPT-4.1 mini: 30.4 (#286), Grok 4.1 Fast: 33.8 (#236)
| Benchmark | GPT-4.1 mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Coding | 1367 | 1411 |
| SWE-bench Verified (bash only) | 23.9% | — |
| Aider Polyglot | 32.4% | — |
| LMArena WebDev | — | 1241 |
| SciCode | 40.4% | — |
| WeirdML | 37.6% | — |
| BigCodeBench Instruct | 48.9% | — |
| CadEval | 16% | — |
| ALE-Bench | — | 394.93 |
Agentic & Tool Use Grok 4.1 Fast leads
GPT-4.1 mini: 33.0 (#52), Grok 4.1 Fast: 36.1 (#35)
| Benchmark | GPT-4.1 mini | Grok 4.1 Fast |
|---|---|---|
| Berkeley Function Calling Leaderboard | 50.5% | 69.6% |
| τ²-bench Banking | — | 13.1% |
| LMArena Search | — | 1171 |
| Vending-Bench 2 | — | 1,107 |
Reasoning Grok 4.1 Fast leads
GPT-4.1 mini: 10.9 (#335), Grok 4.1 Fast: 42.3 (#45)
| Benchmark | GPT-4.1 mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Hard Prompts | 1349 | 1407 |
| DTBench | 68.8% | 87.7% |
| ARC-AGI-2 | 0% | — |
| SimpleBench | — | 56% |
| Kagi LLM Benchmark | 48.6% | — |
| NYT Connections (extended) | — | 87.4% |
| ARC-AGI-1 | 3.5% | — |
| CritPt | 0% | — |
| Chess Puzzles | 7% | — |
| Mystery Game Puzzles | 7% | — |
| LMCA | 21.1% | — |
| Epoch Capabilities Index | 135.01 | — |
| ForecastBench | — | 61 |
Math Grok 4.1 Fast leads
GPT-4.1 mini: 23.1 (#264), Grok 4.1 Fast: 30.9 (#201)
| Benchmark | GPT-4.1 mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Math | 1343 | 1408 |
| FrontierMath (Tiers 1-3) | 6.7% | — |
| MathArena Final-Answer Competitions | — | 60.9% |
| OTIS Mock AIME 2024-2025 | 44.7% | — |
| ProofBench | — | 4% |
| Omni-MATH | 49.1% | — |
| MATH Level 5 | 87.3% | — |
| FrontierMath (Feb 2025 set) | 4.5% | — |
Knowledge GPT-4.1 mini leads
GPT-4.1 mini: 34.7 (#183), Grok 4.1 Fast: 32.6 (#203)
| Benchmark | GPT-4.1 mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Expert | 1338 | 1398 |
| GPQA Diamond | 65.8% | — |
| SimpleQA Verified | 12.7% | — |
| MMLU-Pro | 78.3% | — |
| Vectara Hallucination Rate | — | 17.8% |
| GPQA (HELM) | 61.4% | — |
Multimodal Grok 4.1 Fast leads
GPT-4.1 mini: 35.2 (#77), Grok 4.1 Fast: 36.3 (#71)
| Benchmark | GPT-4.1 mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Vision | 1181 | 1201 |
Multilingual Grok 4.1 Fast leads
GPT-4.1 mini: 45.9 (#161), Grok 4.1 Fast: 51.1 (#110)
| Benchmark | GPT-4.1 mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Non-English | 1318 | 1391 |
| LMArena Chinese | 1329 | 1441 |
| LMArena French | 1357 | 1416 |
| LMArena German | 1349 | 1404 |
| LMArena Japanese | 1291 | 1347 |
| LMArena Korean | 1298 | 1361 |
| LMArena Russian | 1324 | 1387 |
| LMArena Spanish | 1319 | 1411 |
Instruction Following GPT-4.1 mini leads
GPT-4.1 mini: 73.9 (#113), Grok 4.1 Fast: 72.8 (#127)
| Benchmark | GPT-4.1 mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Instruction Following | 1332 | 1376 |
| IFEval | 90.4% | — |
Long Context Grok 4.1 Fast leads
GPT-4.1 mini: 31.8 (#270), Grok 4.1 Fast: 42.4 (#121)
| Benchmark | GPT-4.1 mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Longer Query | 1344 | 1390 |
| Fiction.LiveBench | 44.4% | — |
Writing & Preference Grok 4.1 Fast leads
GPT-4.1 mini: 48.8 (#193), Grok 4.1 Fast: 57.4 (#126)
| Benchmark | GPT-4.1 mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Text | 1341 | 1408 |
| LMArena Creative Writing | 1300 | 1394 |
| EQ-Bench Creative Writing | 1147 | 1327 |
| LMArena Multi-Turn | 1354 | 1389 |
| WildBench | 83.8% | — |
Frequently asked questions
Is GPT-4.1 mini better than Grok 4.1 Fast?
Grok 4.1 Fast is the stronger model overall, scoring 40.9 to 33.5 on the Noometry Index.
Which is cheaper, GPT-4.1 mini or Grok 4.1 Fast?
Grok 4.1 Fast is cheaper. It lists at $0.20 per million input tokens and $0.50 per million output tokens; GPT-4.1 mini lists at $0.40 and $1.60.
Is GPT-4.1 mini or Grok 4.1 Fast better for coding?
Grok 4.1 Fast scores higher on coding benchmarks: 33.8 versus 30.4 in the Noometry coding category.
Which has the bigger context window?
GPT-4.1 mini does, with 1.05M tokens against 128K.
How many benchmarks do GPT-4.1 mini and Grok 4.1 Fast share?
21 benchmarks have published results for both models. GPT-4.1 mini has 47 scored results on Noometry and Grok 4.1 Fast has 32.