Model comparison
Grok 4.1 Fast vs o3-mini
Grok 4.1 Fast is the stronger model overall, scoring 40.9 to 36.7 on the Noometry Index.
Last verified . 20 shared benchmarks.
Summary
- They share 20 benchmarks with published results for both. Grok 4.1 Fast scores higher in 6 categories and o3-mini in 3 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 42.3 to 16.3.
- The biggest single-benchmark swing is SimpleBench: 56% for Grok 4.1 Fast and 22.8% for o3-mini.
- Grok 4.1 Fast is cheaper at $0.20 / $0.50 per million input/output tokens, against $1.10 / $4.40 for o3-mini.
- o3-mini accepts more context: 200K tokens versus 128K.
Side by side
| Grok 4.1 Fast | o3-mini | |
|---|---|---|
| Provider | xAI | OpenAI |
| Noometry Index | 40.9 | 36.7 |
| Released | 2025-06-27 | 2024-12-20 |
| 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 | 51 |
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Category by category
Coding o3-mini leads
Grok 4.1 Fast: 33.8 (#236), o3-mini: 41.4 (#116)
| Benchmark | Grok 4.1 Fast | o3-mini |
|---|---|---|
| LMArena Coding | 1411 | 1378 |
| Aider Polyglot | — | 60.4% |
| LMArena WebDev | 1241 | — |
| SciCode | — | 39.8% |
| GSO | — | 1.3% |
| WeirdML | — | 43.7% |
| LiveBench Coding | — | 82.7% |
| CadEval | — | 54% |
| ALE-Bench | 394.93 | — |
Agentic & Tool Use Grok 4.1 Fast leads
Grok 4.1 Fast: 36.1 (#35), o3-mini: 29.3 (#79)
| Benchmark | Grok 4.1 Fast | o3-mini |
|---|---|---|
| Berkeley Function Calling Leaderboard | 69.6% | — |
| τ²-bench Banking | 13.1% | — |
| Cybench | — | 22.5% |
| LMArena Search | 1171 | — |
| Vending-Bench 2 | 1,107 | — |
Reasoning Grok 4.1 Fast leads
Grok 4.1 Fast: 42.3 (#45), o3-mini: 16.3 (#295)
| Benchmark | Grok 4.1 Fast | o3-mini |
|---|---|---|
| SimpleBench | 56% | 22.8% |
| LMArena Hard Prompts | 1407 | 1366 |
| DTBench | 87.7% | 68.8% |
| ForecastBench | 61 | 59.6 |
| ARC-AGI-2 | — | 3% |
| NYT Connections (extended) | 87.4% | — |
| ARC-AGI-1 | — | 34.5% |
| CritPt | — | 0.3% |
| Chess Puzzles | — | 17% |
| LiveBench Reasoning | — | 89.6% |
| Mystery Game Puzzles | — | 7% |
| LiveBench Data Analysis | — | 70.6% |
| LMCA | — | 19% |
| Epoch Capabilities Index | — | 140.35 |
| LiveBench | — | 75.9% |
Math Grok 4.1 Fast leads
Grok 4.1 Fast: 30.9 (#201), o3-mini: 27.6 (#236)
| Benchmark | Grok 4.1 Fast | o3-mini |
|---|---|---|
| LMArena Math | 1408 | 1396 |
| FrontierMath (Tiers 1-3) | — | 18.6% |
| FrontierMath Tier 4 | — | 0% |
| MathArena Final-Answer Competitions | 60.9% | — |
| OTIS Mock AIME 2024-2025 | — | 76.9% |
| ProofBench | 4% | — |
| LiveBench Math | — | 77.3% |
| MATH Level 5 | — | 96.5% |
| FrontierMath (Feb 2025 set) | — | 12.4% |
| FrontierMath Tier 4 (v1) | — | 4.2% |
Knowledge o3-mini leads
Grok 4.1 Fast: 32.6 (#203), o3-mini: 38.3 (#135)
| Benchmark | Grok 4.1 Fast | o3-mini |
|---|---|---|
| LMArena Expert | 1398 | 1364 |
| GPQA Diamond | — | 77% |
| SimpleQA Verified | — | 15.3% |
| Confabulations | — | 17.9% |
| Vectara Hallucination Rate | 17.8% | — |
Multimodal Not comparable
Grok 4.1 Fast: 36.3 (#71), o3-mini: —
| Benchmark | Grok 4.1 Fast | o3-mini |
|---|---|---|
| LMArena Vision | 1201 | — |
Multilingual Grok 4.1 Fast leads
Grok 4.1 Fast: 51.1 (#110), o3-mini: 45.9 (#159)
| Benchmark | Grok 4.1 Fast | o3-mini |
|---|---|---|
| LMArena Non-English | 1391 | 1319 |
| LMArena Chinese | 1441 | 1379 |
| LMArena French | 1416 | 1333 |
| LMArena German | 1404 | 1303 |
| LMArena Japanese | 1347 | 1286 |
| LMArena Korean | 1361 | 1314 |
| LMArena Russian | 1387 | 1304 |
| LMArena Spanish | 1411 | 1321 |
Instruction Following o3-mini leads
Grok 4.1 Fast: 72.8 (#127), o3-mini: 75.3 (#67)
| Benchmark | Grok 4.1 Fast | o3-mini |
|---|---|---|
| LMArena Instruction Following | 1376 | 1338 |
| LiveBench Instruction Following | — | 84.4% |
Long Context Grok 4.1 Fast leads
Grok 4.1 Fast: 42.4 (#121), o3-mini: 33.8 (#251)
| Benchmark | Grok 4.1 Fast | o3-mini |
|---|---|---|
| LMArena Longer Query | 1390 | 1343 |
| Fiction.LiveBench | — | 50% |
Writing & Preference Grok 4.1 Fast leads
Grok 4.1 Fast: 57.4 (#126), o3-mini: 50.4 (#177)
| Benchmark | Grok 4.1 Fast | o3-mini |
|---|---|---|
| LMArena Text | 1408 | 1337 |
| LMArena Creative Writing | 1394 | 1286 |
| LMArena Multi-Turn | 1389 | 1320 |
| Short-Story Creative Writing | — | 61.7% |
| EQ-Bench Creative Writing | 1327 | — |
| LiveBench Language | — | 50.7% |
Frequently asked questions
Is Grok 4.1 Fast better than o3-mini?
Grok 4.1 Fast is the stronger model overall, scoring 40.9 to 36.7 on the Noometry Index.
Which is cheaper, Grok 4.1 Fast or o3-mini?
Grok 4.1 Fast is cheaper. It lists at $0.20 per million input tokens and $0.50 per million output tokens; o3-mini lists at $1.10 and $4.40.
Is Grok 4.1 Fast or o3-mini better for coding?
o3-mini scores higher on coding benchmarks: 41.4 versus 33.8 in the Noometry coding category.
Which has the bigger context window?
o3-mini does, with 200K tokens against 128K.
How many benchmarks do Grok 4.1 Fast and o3-mini share?
20 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and o3-mini has 51.