Model comparison
Gemma 4 31B IT vs Grok 4.1 Fast
Gemma 4 31B IT is the stronger model overall, scoring 43.5 to 41.4 on the Noometry Index.
Last verified . 21 shared benchmarks.
GoogleSummary
- They share 21 benchmarks with published results for both. Gemma 4 31B IT scores higher in 8 categories and Grok 4.1 Fast in 1 category; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 43.4 to 27.2.
- The biggest single-benchmark swing is NYT Connections (extended): 70.6% for Gemma 4 31B IT and 87.4% for Grok 4.1 Fast.
- Gemma 4 31B IT is cheaper at $0.09 / $0.34 per million input/output tokens, against $0.20 / $0.50 for Grok 4.1 Fast.
- Gemma 4 31B IT accepts more context: 262K tokens versus 128K.
- Gemma 4 31B IT has downloadable open weights; the other is API-only.
Side by side
| Gemma 4 31B IT | Grok 4.1 Fast | |
|---|---|---|
| Provider | xAI | |
| Noometry Index | 43.5 | 41.4 |
| Released | 2026-04-02 | 2025-06-27 |
| Weights | Open | Proprietary |
| Context window | 262K | 128K |
| Max output | 33K | 30K |
| Input $ / M tokens | $0.09 | $0.20 |
| Output $ / M tokens | $0.34 | $0.50 |
| Results tracked | 35 | 32 |
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Category by category
Coding Gemma 4 31B IT leads
Gemma 4 31B IT: 42.3 (#108), Grok 4.1 Fast: 34.1 (#245)
| Benchmark | Gemma 4 31B IT | Grok 4.1 Fast |
|---|---|---|
| LMArena WebDev | 1366 | 1242 |
| LMArena Coding | 1459 | 1411 |
| ALE-Bench | 925.5 | 394.93 |
| SciCode | 43.4% | — |
| WeirdML | 52.3% | — |
Agentic & Tool Use Not comparable
Gemma 4 31B IT: —, Grok 4.1 Fast: 36.3 (#39)
| Benchmark | Gemma 4 31B IT | 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
Gemma 4 31B IT: 27.2 (#122), Grok 4.1 Fast: 43.4 (#49)
| Benchmark | Gemma 4 31B IT | Grok 4.1 Fast |
|---|---|---|
| NYT Connections (extended) | 70.6% | 87.4% |
| LMArena Hard Prompts | 1448 | 1407 |
| DTBench | 82.7% | 87.7% |
| SimpleBench | — | 56% |
| Kagi LLM Benchmark | 63.5% | — |
| CritPt | 1.4% | — |
| Chess Puzzles | 5% | — |
| Thematic Generalization | 53% | — |
| LMCA | 39.3% | — |
| Surface Evolver Bench | 30.6% | — |
| Epoch Capabilities Index | 142.74 | — |
| ForecastBench | — | 61 |
Math Gemma 4 31B IT leads
Gemma 4 31B IT: 43.2 (#81), Grok 4.1 Fast: 31.9 (#221)
| Benchmark | Gemma 4 31B IT | Grok 4.1 Fast |
|---|---|---|
| LMArena Math | 1465 | 1408 |
| MathArena Final-Answer Competitions | — | 60.9% |
| OTIS Mock AIME 2024-2025 | 73.3% | — |
| ProofBench | — | 4% |
Knowledge Gemma 4 31B IT leads
Gemma 4 31B IT: 37.9 (#151), Grok 4.1 Fast: 33.1 (#207)
| Benchmark | Gemma 4 31B IT | Grok 4.1 Fast |
|---|---|---|
| Vectara Hallucination Rate | 7.4% | 17.8% |
| LMArena Expert | 1465 | 1399 |
| GPQA Diamond | 75.8% | — |
| SimpleQA Verified | 10.4% | — |
Multimodal Gemma 4 31B IT leads
Gemma 4 31B IT: 41.6 (#34), Grok 4.1 Fast: 37.0 (#76)
| Benchmark | Gemma 4 31B IT | Grok 4.1 Fast |
|---|---|---|
| LMArena Vision | 1277 | 1201 |
| LMArena Document | 1425 | — |
Multilingual Gemma 4 31B IT leads
Gemma 4 31B IT: 53.8 (#57), Grok 4.1 Fast: 51.0 (#114)
| Benchmark | Gemma 4 31B IT | Grok 4.1 Fast |
|---|---|---|
| LMArena Non-English | 1431 | 1391 |
| LMArena Chinese | 1476 | 1441 |
| LMArena French | 1435 | 1415 |
| LMArena Russian | 1460 | 1387 |
| LMArena Spanish | 1444 | 1413 |
| LMArena German | — | 1404 |
| LMArena Japanese | — | 1349 |
| LMArena Korean | — | 1361 |
Instruction Following Gemma 4 31B IT leads
Gemma 4 31B IT: 75.5 (#61), Grok 4.1 Fast: 72.7 (#133)
| Benchmark | Gemma 4 31B IT | Grok 4.1 Fast |
|---|---|---|
| LMArena Instruction Following | 1433 | 1376 |
Long Context Gemma 4 31B IT leads
Gemma 4 31B IT: 44.2 (#71), Grok 4.1 Fast: 42.4 (#126)
| Benchmark | Gemma 4 31B IT | Grok 4.1 Fast |
|---|---|---|
| LMArena Longer Query | 1446 | 1390 |
Writing & Preference Gemma 4 31B IT leads
Gemma 4 31B IT: 60.5 (#96), Grok 4.1 Fast: 57.2 (#131)
| Benchmark | Gemma 4 31B IT | Grok 4.1 Fast |
|---|---|---|
| LMArena Text | 1443 | 1408 |
| LMArena Creative Writing | 1415 | 1394 |
| EQ-Bench Creative Writing | 1368 | 1327 |
| LMArena Multi-Turn | 1452 | 1389 |
| EQ-Bench 4 | 1120 | — |
Frequently asked questions
Is Gemma 4 31B IT better than Grok 4.1 Fast?
Gemma 4 31B IT is the stronger model overall, scoring 43.5 to 41.4 on the Noometry Index.
Which is cheaper, Gemma 4 31B IT or Grok 4.1 Fast?
Gemma 4 31B IT is cheaper. It lists at $0.09 per million input tokens and $0.34 per million output tokens; Grok 4.1 Fast lists at $0.20 and $0.50.
Is Gemma 4 31B IT or Grok 4.1 Fast better for coding?
Gemma 4 31B IT scores higher on coding benchmarks: 42.3 versus 34.1 in the Noometry coding category.
Which has the bigger context window?
Gemma 4 31B IT does, with 262K tokens against 128K.
How many benchmarks do Gemma 4 31B IT and Grok 4.1 Fast share?
21 benchmarks have published results for both models. Gemma 4 31B IT has 35 scored results on Noometry and Grok 4.1 Fast has 32.