Model comparison
Granite 4.1 8b vs Grok 4.1 Fast
Grok 4.1 Fast is the stronger model overall, scoring 41.4 to 37.4 on the Noometry Index.
Last verified . 13 shared benchmarks.
Summary
- They share 13 benchmarks with published results for both. Granite 4.1 8b scores higher in 2 categories and Grok 4.1 Fast in 6 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 43.4 to 25.7.
- Granite 4.1 8b has downloadable open weights; the other is API-only.
Side by side
| Granite 4.1 8b | Grok 4.1 Fast | |
|---|---|---|
| Provider | IBM | xAI |
| Noometry Index | 37.4 | 41.4 |
| Released | — | 2025-06-27 |
| Weights | Open | Proprietary |
| Context window | — | 128K |
| Max output | — | 30K |
| Input $ / M tokens | — | $0.20 |
| Output $ / M tokens | — | $0.50 |
| Results tracked | 13 | 32 |
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Category by category
Coding Grok 4.1 Fast leads
Granite 4.1 8b: 30.1 (#297), Grok 4.1 Fast: 34.1 (#245)
| Benchmark | Granite 4.1 8b | Grok 4.1 Fast |
|---|---|---|
| LMArena WebDev | 1192 | 1242 |
| LMArena Coding | 1312 | 1411 |
| ALE-Bench | — | 394.93 |
Agentic & Tool Use Not comparable
Granite 4.1 8b: —, Grok 4.1 Fast: 36.3 (#39)
| Benchmark | Granite 4.1 8b | Grok 4.1 Fast |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 69.6% |
| τ²-bench Banking | — | 13.1% |
| LMArena Search | — | 1171 |
| Vending-Bench 2 | — | 1,107 |
Reasoning Grok 4.1 Fast leads
Granite 4.1 8b: 25.7 (#143), Grok 4.1 Fast: 43.4 (#49)
| Benchmark | Granite 4.1 8b | Grok 4.1 Fast |
|---|---|---|
| LMArena Hard Prompts | 1293 | 1407 |
| SimpleBench | — | 56% |
| NYT Connections (extended) | — | 87.4% |
| DTBench | — | 87.7% |
| ForecastBench | — | 61 |
Math Granite 4.1 8b leads
Granite 4.1 8b: 36.4 (#166), Grok 4.1 Fast: 31.9 (#221)
| Benchmark | Granite 4.1 8b | Grok 4.1 Fast |
|---|---|---|
| LMArena Math | 1312 | 1408 |
| MathArena Final-Answer Competitions | — | 60.9% |
| ProofBench | — | 4% |
Knowledge Granite 4.1 8b leads
Granite 4.1 8b: 36.1 (#174), Grok 4.1 Fast: 33.1 (#207)
| Benchmark | Granite 4.1 8b | Grok 4.1 Fast |
|---|---|---|
| LMArena Expert | 1309 | 1399 |
| Vectara Hallucination Rate | — | 17.8% |
Multimodal Not comparable
Granite 4.1 8b: —, Grok 4.1 Fast: 37.0 (#76)
| Benchmark | Granite 4.1 8b | Grok 4.1 Fast |
|---|---|---|
| LMArena Vision | — | 1201 |
Multilingual Grok 4.1 Fast leads
Granite 4.1 8b: 41.7 (#204), Grok 4.1 Fast: 51.0 (#114)
| Benchmark | Granite 4.1 8b | Grok 4.1 Fast |
|---|---|---|
| LMArena Non-English | 1261 | 1391 |
| LMArena Chinese | 1337 | 1441 |
| LMArena Russian | 1240 | 1387 |
| LMArena French | — | 1415 |
| LMArena German | — | 1404 |
| LMArena Japanese | — | 1349 |
| LMArena Korean | — | 1361 |
| LMArena Spanish | — | 1413 |
Instruction Following Grok 4.1 Fast leads
Granite 4.1 8b: 66.9 (#203), Grok 4.1 Fast: 72.7 (#133)
| Benchmark | Granite 4.1 8b | Grok 4.1 Fast |
|---|---|---|
| LMArena Instruction Following | 1269 | 1376 |
Long Context Grok 4.1 Fast leads
Granite 4.1 8b: 38.7 (#193), Grok 4.1 Fast: 42.4 (#126)
| Benchmark | Granite 4.1 8b | Grok 4.1 Fast |
|---|---|---|
| LMArena Longer Query | 1275 | 1390 |
Writing & Preference Grok 4.1 Fast leads
Granite 4.1 8b: 48.1 (#204), Grok 4.1 Fast: 57.2 (#131)
| Benchmark | Granite 4.1 8b | Grok 4.1 Fast |
|---|---|---|
| LMArena Text | 1290 | 1408 |
| LMArena Creative Writing | 1251 | 1394 |
| LMArena Multi-Turn | 1268 | 1389 |
| EQ-Bench Creative Writing | — | 1327 |
Frequently asked questions
Is Granite 4.1 8b better than Grok 4.1 Fast?
Grok 4.1 Fast is the stronger model overall, scoring 41.4 to 37.4 on the Noometry Index.
Is Granite 4.1 8b or Grok 4.1 Fast better for coding?
Grok 4.1 Fast scores higher on coding benchmarks: 34.1 versus 30.1 in the Noometry coding category.
How many benchmarks do Granite 4.1 8b and Grok 4.1 Fast share?
13 benchmarks have published results for both models. Granite 4.1 8b has 13 scored results on Noometry and Grok 4.1 Fast has 32.