Model comparison
Grok 4.1 Fast vs o4-mini
Grok 4.1 Fast and o4-mini score almost the same on the Noometry Index (41.4 vs 41.6), so choose on price, context window or the category you care about most.
Last verified . 24 shared benchmarks.
Summary
- They share 24 benchmarks with published results for both. Grok 4.1 Fast scores higher in 4 categories and o4-mini in 6 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 43.4 to 24.6.
- The biggest single-benchmark swing is SimpleBench: 56% for Grok 4.1 Fast and 38.7% for o4-mini.
- Grok 4.1 Fast is cheaper at $0.20 / $0.50 per million input/output tokens, against $1.10 / $4.40 for o4-mini.
- o4-mini accepts more context: 200K tokens versus 128K.
Side by side
| Grok 4.1 Fast | o4-mini | |
|---|---|---|
| Provider | xAI | OpenAI |
| Noometry Index | 41.4 | 41.6 |
| Released | 2025-06-27 | 2025-04-16 |
| Weights | Proprietary | Proprietary |
| Context window | 128K | 200K |
| Max output | 30K | 100K |
| Input $ / M tokens | $0.20 | $1.10 |
| Output $ / M tokens | $0.50 | $4.40 |
| Results tracked | 32 | 60 |
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Category by category
Coding o4-mini leads
Grok 4.1 Fast: 34.1 (#245), o4-mini: 40.9 (#127)
| Benchmark | Grok 4.1 Fast | o4-mini |
|---|---|---|
| LMArena Coding | 1411 | 1368 |
| ALE-Bench | 394.93 | 826.17 |
| SWE-bench Verified (bash only) | — | 45% |
| Aider Polyglot | — | 72% |
| LMArena WebDev | 1242 | — |
| GSO | — | 3.6% |
| WeirdML | — | 52.6% |
| CadEval | — | 62% |
| AlgoTune | — | 1.72 |
Agentic & Tool Use Grok 4.1 Fast leads
Grok 4.1 Fast: 36.3 (#39), o4-mini: 32.6 (#61)
| Benchmark | Grok 4.1 Fast | o4-mini |
|---|---|---|
| Berkeley Function Calling Leaderboard | 69.6% | 53.2% |
| GDPval | — | 25.3% |
| τ²-bench Banking | 13.1% | — |
| LMArena Search | 1171 | — |
| METR Time Horizons | — | 63.9% |
| Vending-Bench 2 | 1,107 | — |
Reasoning Grok 4.1 Fast leads
Grok 4.1 Fast: 43.4 (#49), o4-mini: 24.6 (#162)
| Benchmark | Grok 4.1 Fast | o4-mini |
|---|---|---|
| SimpleBench | 56% | 38.7% |
| LMArena Hard Prompts | 1407 | 1351 |
| DTBench | 87.7% | 77.6% |
| ForecastBench | 61 | 61.8 |
| ARC-AGI-2 | — | 6.1% |
| Kagi LLM Benchmark | — | 67.6% |
| NYT Connections (extended) | 87.4% | — |
| ARC-AGI-1 | — | 58.7% |
| CritPt | — | 0.6% |
| Chess Puzzles | — | 26% |
| EnigmaEval | — | 9.2% |
| Mystery Game Puzzles | — | 5% |
| LMCA | — | 26.5% |
| Epoch Capabilities Index | — | 145.64 |
Math o4-mini leads
Grok 4.1 Fast: 31.9 (#221), o4-mini: 40.8 (#89)
| Benchmark | Grok 4.1 Fast | o4-mini |
|---|---|---|
| LMArena Math | 1408 | 1389 |
| FrontierMath (Tiers 1-3) | — | 36.1% |
| FrontierMath Tier 4 | — | 4.9% |
| MathArena Final-Answer Competitions | 60.9% | — |
| OTIS Mock AIME 2024-2025 | — | 81.7% |
| ProofBench | 4% | — |
| Omni-MATH | — | 72% |
| MATH Level 5 | — | 97.8% |
| FrontierMath (Feb 2025 set) | — | 24.8% |
| FrontierMath Tier 4 (v1) | — | 6.3% |
Knowledge o4-mini leads
Grok 4.1 Fast: 33.1 (#207), o4-mini: 43.6 (#91)
| Benchmark | Grok 4.1 Fast | o4-mini |
|---|---|---|
| Vectara Hallucination Rate | 17.8% | 18.6% |
| LMArena Expert | 1399 | 1343 |
| GPQA Diamond | — | 79.6% |
| Humanity's Last Exam | — | 18.1% |
| SimpleQA Verified | — | 19.6% |
| MMLU-Pro | — | 82% |
| Confabulations | — | 15.8% |
| GPQA (HELM) | — | 73.5% |
Multimodal o4-mini leads
Grok 4.1 Fast: 37.0 (#76), o4-mini: 40.2 (#49)
| Benchmark | Grok 4.1 Fast | o4-mini |
|---|---|---|
| LMArena Vision | 1201 | 1194 |
| GeoBench | — | 64% |
| VPCT | — | 57.5% |
Multilingual Grok 4.1 Fast leads
Grok 4.1 Fast: 51.0 (#114), o4-mini: 47.0 (#154)
| Benchmark | Grok 4.1 Fast | o4-mini |
|---|---|---|
| LMArena Non-English | 1391 | 1337 |
| LMArena Chinese | 1441 | 1354 |
| LMArena French | 1415 | 1364 |
| LMArena German | 1404 | 1336 |
| LMArena Japanese | 1349 | 1308 |
| LMArena Korean | 1361 | 1312 |
| LMArena Russian | 1387 | 1334 |
| LMArena Spanish | 1413 | 1347 |
Instruction Following o4-mini leads
Grok 4.1 Fast: 72.7 (#133), o4-mini: 75.2 (#68)
| Benchmark | Grok 4.1 Fast | o4-mini |
|---|---|---|
| LMArena Instruction Following | 1376 | 1321 |
| IFEval | — | 92.8% |
Long Context o4-mini leads
Grok 4.1 Fast: 42.4 (#126), o4-mini: 45.5 (#33)
| Benchmark | Grok 4.1 Fast | o4-mini |
|---|---|---|
| LMArena Longer Query | 1390 | 1315 |
| Fiction.LiveBench | — | 77.8% |
Writing & Preference Grok 4.1 Fast leads
Grok 4.1 Fast: 57.2 (#131), o4-mini: 54.0 (#152)
| Benchmark | Grok 4.1 Fast | o4-mini |
|---|---|---|
| LMArena Text | 1408 | 1353 |
| LMArena Creative Writing | 1394 | 1294 |
| LMArena Multi-Turn | 1389 | 1350 |
| Short-Story Creative Writing | — | 75% |
| EQ-Bench Creative Writing | 1327 | — |
| WildBench | — | 85.4% |
Frequently asked questions
Is Grok 4.1 Fast better than o4-mini?
Grok 4.1 Fast and o4-mini score almost the same on the Noometry Index (41.4 vs 41.6), so choose on price, context window or the category you care about most.
Which is cheaper, Grok 4.1 Fast or o4-mini?
Grok 4.1 Fast is cheaper. It lists at $0.20 per million input tokens and $0.50 per million output tokens; o4-mini lists at $1.10 and $4.40.
Is Grok 4.1 Fast or o4-mini better for coding?
o4-mini scores higher on coding benchmarks: 40.9 versus 34.1 in the Noometry coding category.
Which has the bigger context window?
o4-mini does, with 200K tokens against 128K.
How many benchmarks do Grok 4.1 Fast and o4-mini share?
24 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and o4-mini has 60.