Model comparison
GPT-4o mini vs Grok 4.1 Fast
Grok 4.1 Fast is the stronger model overall, scoring 41.4 to 25.5 on the Noometry Index.
Last verified . 21 shared benchmarks.
Summary
- They share 21 benchmarks with published results for both. GPT-4o mini scores higher in 0 categories and Grok 4.1 Fast in 10 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 43.4 to 8.7.
- The biggest single-benchmark swing is SimpleBench: 10.7% for GPT-4o mini and 56% for Grok 4.1 Fast.
- Both cost about the same: $0.15 input and $0.60 output per million tokens.
Side by side
| GPT-4o mini | Grok 4.1 Fast | |
|---|---|---|
| Provider | OpenAI | xAI |
| Noometry Index | 25.5 | 41.4 |
| Released | 2024-07-18 | 2025-06-27 |
| Weights | Proprietary | Proprietary |
| Context window | 128K | 128K |
| Max output | 16K | 30K |
| Input $ / M tokens | $0.15 | $0.20 |
| Output $ / M tokens | $0.60 | $0.50 |
| Results tracked | 60 | 32 |
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Category by category
Coding Grok 4.1 Fast leads
GPT-4o mini: 22.0 (#335), Grok 4.1 Fast: 34.1 (#245)
| Benchmark | GPT-4o mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Coding | 1290 | 1411 |
| Aider Polyglot | 3.6% | — |
| LMArena WebDev | — | 1242 |
| WeirdML | 11.8% | — |
| BigCodeBench Instruct | 46.1% | — |
| LiveBench Coding | 43.1% | — |
| BigCodeBench Complete | 57.4% | — |
| ALE-Bench | — | 394.93 |
| HumanEval+ | 83.5% | — |
| MBPP+ | 72.2% | — |
Agentic & Tool Use Grok 4.1 Fast leads
GPT-4o mini: 27.5 (#101), Grok 4.1 Fast: 36.3 (#39)
| Benchmark | GPT-4o mini | Grok 4.1 Fast |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 69.6% |
| τ²-bench Banking | — | 13.1% |
| BALROG | 17.4% | — |
| LMArena Search | — | 1171 |
| Vending-Bench 2 | — | 1,107 |
Reasoning Grok 4.1 Fast leads
GPT-4o mini: 8.7 (#347), Grok 4.1 Fast: 43.4 (#49)
| Benchmark | GPT-4o mini | Grok 4.1 Fast |
|---|---|---|
| SimpleBench | 10.7% | 56% |
| LMArena Hard Prompts | 1267 | 1407 |
| DTBench | 54.4% | 87.7% |
| ARC-AGI-2 | 0% | — |
| Kagi LLM Benchmark | 28.8% | — |
| NYT Connections (extended) | — | 87.4% |
| Chess Puzzles | 0% | — |
| LiveBench Reasoning | 32.8% | — |
| Mystery Game Puzzles | 12% | — |
| LiveBench Data Analysis | 50% | — |
| LMCA | 10.4% | — |
| Epoch Capabilities Index | 126.56 | — |
| ForecastBench | — | 61 |
| LiveBench | 41.3% | — |
| PIQA | 88.7% | — |
Math Grok 4.1 Fast leads
GPT-4o mini: 10.4 (#314), Grok 4.1 Fast: 31.9 (#221)
| Benchmark | GPT-4o mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Math | 1267 | 1408 |
| FrontierMath (Tiers 1-3) | 0.7% | — |
| MathArena Final-Answer Competitions | — | 60.9% |
| OTIS Mock AIME 2024-2025 | 6.9% | — |
| ProofBench | — | 4% |
| Omni-MATH | 28% | — |
| LiveBench Math | 36.3% | — |
| MATH Level 5 | 52.6% | — |
| GSM8K | 91.3% | — |
Knowledge Grok 4.1 Fast leads
GPT-4o mini: 17.7 (#284), Grok 4.1 Fast: 33.1 (#207)
| Benchmark | GPT-4o mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Expert | 1235 | 1399 |
| GPQA Diamond | 37.7% | — |
| SimpleQA Verified | 8.3% | — |
| MMLU-Pro | 60.3% | — |
| Confabulations | 37.2% | — |
| Vectara Hallucination Rate | — | 17.8% |
| GPQA (HELM) | 36.8% | — |
| BoolQ | 88.7% | — |
| MMLU | 81.8% | — |
Multimodal Grok 4.1 Fast leads
GPT-4o mini: 25.9 (#122), Grok 4.1 Fast: 37.0 (#76)
| Benchmark | GPT-4o mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Vision | 1066 | 1201 |
| Video-MME | 64.8% | — |
| GeoBench | 64% | — |
| VPCT | 34% | — |
Multilingual Grok 4.1 Fast leads
GPT-4o mini: 42.0 (#199), Grok 4.1 Fast: 51.0 (#114)
| Benchmark | GPT-4o mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Non-English | 1266 | 1391 |
| LMArena Chinese | 1265 | 1441 |
| LMArena French | 1297 | 1415 |
| LMArena German | 1272 | 1404 |
| LMArena Japanese | 1216 | 1349 |
| LMArena Korean | 1195 | 1361 |
| LMArena Russian | 1275 | 1387 |
| LMArena Spanish | 1276 | 1413 |
Instruction Following Grok 4.1 Fast leads
GPT-4o mini: 61.9 (#239), Grok 4.1 Fast: 72.7 (#133)
| Benchmark | GPT-4o mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Instruction Following | 1258 | 1376 |
| LiveBench Instruction Following | 56.8% | — |
| IFEval | 78.2% | — |
Long Context Grok 4.1 Fast leads
GPT-4o mini: 39.1 (#186), Grok 4.1 Fast: 42.4 (#126)
| Benchmark | GPT-4o mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Longer Query | 1289 | 1390 |
Writing & Preference Grok 4.1 Fast leads
GPT-4o mini: 39.5 (#248), Grok 4.1 Fast: 57.2 (#131)
| Benchmark | GPT-4o mini | Grok 4.1 Fast |
|---|---|---|
| LMArena Text | 1286 | 1408 |
| LMArena Creative Writing | 1268 | 1394 |
| EQ-Bench Creative Writing | 873 | 1327 |
| LMArena Multi-Turn | 1285 | 1389 |
| Short-Story Creative Writing | 67.2% | — |
| WildBench | 79.1% | — |
| LiveBench Language | 28.6% | — |
Frequently asked questions
Is GPT-4o mini better than Grok 4.1 Fast?
Grok 4.1 Fast is the stronger model overall, scoring 41.4 to 25.5 on the Noometry Index.
Which is cheaper, GPT-4o mini or Grok 4.1 Fast?
GPT-4o mini is cheaper. It lists at $0.15 per million input tokens and $0.60 per million output tokens; Grok 4.1 Fast lists at $0.20 and $0.50.
Is GPT-4o mini or Grok 4.1 Fast better for coding?
Grok 4.1 Fast scores higher on coding benchmarks: 34.1 versus 22.0 in the Noometry coding category.
Which has the bigger context window?
Both accept 128K tokens.
How many benchmarks do GPT-4o mini and Grok 4.1 Fast share?
21 benchmarks have published results for both models. GPT-4o mini has 60 scored results on Noometry and Grok 4.1 Fast has 32.