Model comparison
Grok 4.1 vs Grok 4.1 Fast
Grok 4.1 and Grok 4.1 Fast score almost the same on the Noometry Index (41.5 vs 41.4), so choose on price, context window or the category you care about most.
Last verified . 18 shared benchmarks.
Summary
- They share 18 benchmarks with published results for both. Grok 4.1 scores higher in 6 categories and Grok 4.1 Fast in 3 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 43.4 to 29.5.
Side by side
| Grok 4.1 | Grok 4.1 Fast | |
|---|---|---|
| Provider | xAI | xAI |
| Noometry Index | 41.5 | 41.4 |
| Released | 2025-11-17 | 2025-06-27 |
| Weights | Proprietary | Proprietary |
| Context window | — | 128K |
| Max output | — | 30K |
| Input $ / M tokens | — | $0.20 |
| Output $ / M tokens | — | $0.50 |
| Results tracked | 19 | 32 |
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Category by category
Coding Too close to call
Grok 4.1: 33.7 (#253), Grok 4.1 Fast: 34.1 (#245)
| Benchmark | Grok 4.1 | Grok 4.1 Fast |
|---|---|---|
| LMArena WebDev | 1214 | 1242 |
| LMArena Coding | 1445 | 1411 |
| ALE-Bench | — | 394.93 |
Agentic & Tool Use Grok 4.1 Fast leads
Grok 4.1: 34.1 (#49), Grok 4.1 Fast: 36.3 (#39)
| Benchmark | Grok 4.1 | Grok 4.1 Fast |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 69.6% |
| τ²-bench Banking | — | 13.1% |
| Cybench | 39% | — |
| LMArena Search | — | 1171 |
| Vending-Bench 2 | — | 1,107 |
Reasoning Grok 4.1 Fast leads
Grok 4.1: 29.5 (#91), Grok 4.1 Fast: 43.4 (#49)
| Benchmark | Grok 4.1 | Grok 4.1 Fast |
|---|---|---|
| LMArena Hard Prompts | 1435 | 1407 |
| SimpleBench | — | 56% |
| NYT Connections (extended) | — | 87.4% |
| DTBench | — | 87.7% |
| ForecastBench | — | 61 |
Math Grok 4.1 leads
Grok 4.1: 38.9 (#120), Grok 4.1 Fast: 31.9 (#221)
| Benchmark | Grok 4.1 | Grok 4.1 Fast |
|---|---|---|
| LMArena Math | 1422 | 1408 |
| MathArena Final-Answer Competitions | — | 60.9% |
| ProofBench | — | 4% |
Knowledge Grok 4.1 leads
Grok 4.1: 39.5 (#133), Grok 4.1 Fast: 33.1 (#207)
| Benchmark | Grok 4.1 | Grok 4.1 Fast |
|---|---|---|
| LMArena Expert | 1417 | 1399 |
| Vectara Hallucination Rate | — | 17.8% |
Multimodal Not comparable
Grok 4.1: —, Grok 4.1 Fast: 37.0 (#76)
| Benchmark | Grok 4.1 | Grok 4.1 Fast |
|---|---|---|
| LMArena Vision | — | 1201 |
Multilingual Grok 4.1 leads
Grok 4.1: 53.4 (#68), Grok 4.1 Fast: 51.0 (#114)
| Benchmark | Grok 4.1 | Grok 4.1 Fast |
|---|---|---|
| LMArena Non-English | 1425 | 1391 |
| LMArena Chinese | 1465 | 1441 |
| LMArena French | 1448 | 1415 |
| LMArena German | 1446 | 1404 |
| LMArena Japanese | 1397 | 1349 |
| LMArena Korean | 1407 | 1361 |
| LMArena Russian | 1434 | 1387 |
| LMArena Spanish | 1438 | 1413 |
Instruction Following Grok 4.1 leads
Grok 4.1: 73.8 (#111), Grok 4.1 Fast: 72.7 (#133)
| Benchmark | Grok 4.1 | Grok 4.1 Fast |
|---|---|---|
| LMArena Instruction Following | 1400 | 1376 |
Long Context Too close to call
Grok 4.1: 43.2 (#100), Grok 4.1 Fast: 42.4 (#126)
| Benchmark | Grok 4.1 | Grok 4.1 Fast |
|---|---|---|
| LMArena Longer Query | 1416 | 1390 |
Writing & Preference Grok 4.1 leads
Grok 4.1: 62.4 (#75), Grok 4.1 Fast: 57.2 (#131)
| Benchmark | Grok 4.1 | Grok 4.1 Fast |
|---|---|---|
| LMArena Text | 1437 | 1408 |
| LMArena Creative Writing | 1411 | 1394 |
| LMArena Multi-Turn | 1437 | 1389 |
| EQ-Bench Creative Writing | — | 1327 |
Frequently asked questions
Is Grok 4.1 better than Grok 4.1 Fast?
Grok 4.1 and Grok 4.1 Fast score almost the same on the Noometry Index (41.5 vs 41.4), so choose on price, context window or the category you care about most.
Is Grok 4.1 or Grok 4.1 Fast better for coding?
They score almost the same on coding (33.7 vs 34.1); test both on your own repository before choosing.
How many benchmarks do Grok 4.1 and Grok 4.1 Fast share?
18 benchmarks have published results for both models. Grok 4.1 has 19 scored results on Noometry and Grok 4.1 Fast has 32.