# Gemma 4 31B IT vs Grok 4.20 (Non-Reasoning)

> Grok 4.20 (Non-Reasoning) is the stronger model overall, scoring 48.5 to 43.2 on the Noometry Index. Gemma 4 31B IT costs 10× less per token, which makes it the better buy when Grok 4.20 (Non-Reasoning)'s lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gemma-4-31b-it-vs-grok-4-20
- Last updated: 2026-10-10
- Shared benchmarks: 30

## Summary

- They share 30 benchmarks with published results for both. Gemma 4 31B IT scores higher in 3 categories and Grok 4.20 (Non-Reasoning) in 6 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.20 (Non-Reasoning) leads 52.2 to 26.4.
- The biggest single-benchmark swing is SimpleQA Verified: 10.4% for Gemma 4 31B IT and 30.2% for Grok 4.20 (Non-Reasoning).
- Gemma 4 31B IT is cheaper at $0.09 / $0.34 per million input/output tokens, against $1.25 / $2.50 for Grok 4.20 (Non-Reasoning).
- Grok 4.20 (Non-Reasoning) accepts more context: 1M tokens versus 262K.
- Gemma 4 31B IT has downloadable open weights; the other is API-only.

## Snapshot

| | Gemma 4 31B IT | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| Provider | Google | xAI |
| Noometry Index | 43.2 | 48.5 |
| Rank | 85 | 48 |
| Context | 262K | 1M |
| Input $/M | $0.09 | $1.25 |
| Output $/M | $0.34 | $2.50 |
| Weights | Open | Proprietary |

## Coding

- Gemma 4 31B IT: 41.9 (#98)
- Grok 4.20 (Non-Reasoning): 41.8 (#104)

| Benchmark | Gemma 4 31B IT | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena WebDev | 1364 | 1374 |
| WeirdML | 52.3% | 52.3% |
| LMArena Coding | 1459 | 1458 |
| ALE-Bench | 925.5 | 1,150 |
| SciCode | 43.4% | — |

## Agentic & Tool Use

- Gemma 4 31B IT: —
- Grok 4.20 (Non-Reasoning): 34.3 (#43)

| Benchmark | Gemma 4 31B IT | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| Terminal-Bench | — | 57.3% |
| τ²-bench Banking | — | 18% |
| LMArena Search | — | 1189 |
| Vending-Bench 2 | — | 4,663 |

## Reasoning

- Gemma 4 31B IT: 26.4 (#119)
- Grok 4.20 (Non-Reasoning): 52.2 (#30)

| Benchmark | Gemma 4 31B IT | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| Kagi LLM Benchmark | 63.5% | 75% |
| NYT Connections (extended) | 70.6% | 85.4% |
| Chess Puzzles | 5% | 24% |
| Thematic Generalization | 53% | 63.8% |
| LMArena Hard Prompts | 1448 | 1451 |
| DTBench | 82.7% | 90.1% |
| LMCA | 39.3% | 38.7% |
| Epoch Capabilities Index | 142.74 | 152.01 |
| ARC-AGI-2 | — | 65.1% |
| ARC-AGI-1 | — | 89.5% |
| CritPt | 1.4% | — |
| Surface Evolver Bench | 30.6% | — |
| ForecastBench | — | 61.4 |

## Math

- Gemma 4 31B IT: 41.3 (#72)
- Grok 4.20 (Non-Reasoning): 48.0 (#54)

| Benchmark | Gemma 4 31B IT | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 73.3% | 92.2% |
| LMArena Math | 1464 | 1455 |
| FrontierMath (Tiers 1-3) | — | 44.9% |
| FrontierMath Tier 4 | — | 17.1% |
| ProofBench | — | 14% |

## Knowledge

- Gemma 4 31B IT: 37.9 (#141)
- Grok 4.20 (Non-Reasoning): 52.8 (#54)

| Benchmark | Gemma 4 31B IT | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| GPQA Diamond | 75.8% | 89.3% |
| SimpleQA Verified | 10.4% | 30.2% |
| LMArena Expert | 1465 | 1440 |
| Vectara Hallucination Rate | 7.4% | — |

## Multimodal

- Gemma 4 31B IT: 41.0 (#32)
- Grok 4.20 (Non-Reasoning): 33.2 (#88)

| Benchmark | Gemma 4 31B IT | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Vision | 1278 | 1263 |
| LMArena Document | 1425 | 1416 |
| Blueprint-Bench 2 | — | 0% |

## Multilingual

- Gemma 4 31B IT: 54.0 (#52)
- Grok 4.20 (Non-Reasoning): 54.7 (#38)

| Benchmark | Gemma 4 31B IT | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Non-English | 1431 | 1440 |
| LMArena Chinese | 1478 | 1481 |
| LMArena French | 1436 | 1477 |
| LMArena Russian | 1462 | 1457 |
| LMArena Spanish | 1443 | 1442 |
| LMArena German | — | 1463 |
| LMArena Japanese | — | 1450 |
| LMArena Korean | — | 1417 |

## Instruction Following

- Gemma 4 31B IT: 75.6 (#58)
- Grok 4.20 (Non-Reasoning): 75.0 (#79)

| Benchmark | Gemma 4 31B IT | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Instruction Following | 1433 | 1420 |

## Long Context

- Gemma 4 31B IT: 44.2 (#67)
- Grok 4.20 (Non-Reasoning): 45.4 (#33)

| Benchmark | Gemma 4 31B IT | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Longer Query | 1446 | 1436 |
| CL-bench | — | 22.2% |
| CL-bench Life | — | 11.9% |

## Writing & Preference

- Gemma 4 31B IT: 60.7 (#92)
- Grok 4.20 (Non-Reasoning): 65.9 (#42)

| Benchmark | Gemma 4 31B IT | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Text | 1443 | 1451 |
| LMArena Creative Writing | 1416 | 1439 |
| EQ-Bench Creative Writing | 1368 | 1574 |
| LMArena Multi-Turn | 1452 | 1456 |
| EQ-Bench 4 | 1120 | — |

## FAQ

### Is Gemma 4 31B IT better than Grok 4.20 (Non-Reasoning)?

Grok 4.20 (Non-Reasoning) is the stronger model overall, scoring 48.5 to 43.2 on the Noometry Index. Gemma 4 31B IT costs 10× less per token, which makes it the better buy when Grok 4.20 (Non-Reasoning)'s lead doesn't matter for your workload.

### Which is cheaper, Gemma 4 31B IT or Grok 4.20 (Non-Reasoning)?

Gemma 4 31B IT is cheaper. It lists at $0.09 per million input tokens and $0.34 per million output tokens; Grok 4.20 (Non-Reasoning) lists at $1.25 and $2.50.

### Is Gemma 4 31B IT or Grok 4.20 (Non-Reasoning) better for coding?

They score almost the same on coding (41.9 vs 41.8); test both on your own repository before choosing.

### Which has the bigger context window?

Grok 4.20 (Non-Reasoning) does, with 1M tokens against 262K.

### How many benchmarks do Gemma 4 31B IT and Grok 4.20 (Non-Reasoning) share?

30 benchmarks have published results for both models. Gemma 4 31B IT has 35 scored results on Noometry and Grok 4.20 (Non-Reasoning) has 46.