# Gemini 1.5 Flash 8B vs Grok 4.20 (Non-Reasoning)

> Grok 4.20 (Non-Reasoning) is the stronger model overall, scoring 48.5 to 29.7 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gemini-1-5-flash-8b-vs-grok-4-20
- Last updated: 2026-10-10
- Shared benchmarks: 21

## Summary

- They share 21 benchmarks with published results for both. Gemini 1.5 Flash 8B scores higher in 0 categories and Grok 4.20 (Non-Reasoning) in 9 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Grok 4.20 (Non-Reasoning) leads 52.8 to 16.0.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 4.6% for Gemini 1.5 Flash 8B and 92.2% for Grok 4.20 (Non-Reasoning).

## Snapshot

| | Gemini 1.5 Flash 8B | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| Provider | Google | xAI |
| Noometry Index | 29.7 | 48.5 |
| Rank | 292 | 48 |
| Context | — | 1M |
| Input $/M | — | $1.25 |
| Output $/M | — | $2.50 |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 1.5 Flash 8B: 34.9 (#221)
- Grok 4.20 (Non-Reasoning): 41.8 (#104)

| Benchmark | Gemini 1.5 Flash 8B | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Coding | 1218 | 1458 |
| LMArena WebDev | — | 1374 |
| WeirdML | — | 52.3% |
| ALE-Bench | — | 1,150 |

## Agentic & Tool Use

- Gemini 1.5 Flash 8B: —
- Grok 4.20 (Non-Reasoning): 34.3 (#43)

| Benchmark | Gemini 1.5 Flash 8B | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| Terminal-Bench | — | 57.3% |
| τ²-bench Banking | — | 18% |
| LMArena Search | — | 1189 |
| Vending-Bench 2 | — | 4,663 |

## Reasoning

- Gemini 1.5 Flash 8B: 19.2 (#242)
- Grok 4.20 (Non-Reasoning): 52.2 (#30)

| Benchmark | Gemini 1.5 Flash 8B | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Hard Prompts | 1210 | 1451 |
| DTBench | 50% | 90.1% |
| ARC-AGI-2 | — | 65.1% |
| Kagi LLM Benchmark | — | 75% |
| NYT Connections (extended) | — | 85.4% |
| ARC-AGI-1 | — | 89.5% |
| Chess Puzzles | — | 24% |
| Thematic Generalization | — | 63.8% |
| LMCA | — | 38.7% |
| Epoch Capabilities Index | — | 152.01 |
| ForecastBench | — | 61.4 |

## Math

- Gemini 1.5 Flash 8B: 13.3 (#296)
- Grok 4.20 (Non-Reasoning): 48.0 (#54)

| Benchmark | Gemini 1.5 Flash 8B | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 4.6% | 92.2% |
| LMArena Math | 1207 | 1455 |
| FrontierMath (Tiers 1-3) | — | 44.9% |
| FrontierMath Tier 4 | — | 17.1% |
| ProofBench | — | 14% |

## Knowledge

- Gemini 1.5 Flash 8B: 16.0 (#285)
- Grok 4.20 (Non-Reasoning): 52.8 (#54)

| Benchmark | Gemini 1.5 Flash 8B | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| GPQA Diamond | 33% | 89.3% |
| LMArena Expert | 1185 | 1440 |
| SimpleQA Verified | — | 30.2% |

## Multimodal

- Gemini 1.5 Flash 8B: 27.6 (#110)
- Grok 4.20 (Non-Reasoning): 33.2 (#88)

| Benchmark | Gemini 1.5 Flash 8B | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Vision | 1044 | 1263 |
| Blueprint-Bench 2 | — | 0% |
| LMArena Document | — | 1416 |

## Multilingual

- Gemini 1.5 Flash 8B: 38.6 (#224)
- Grok 4.20 (Non-Reasoning): 54.7 (#38)

| Benchmark | Gemini 1.5 Flash 8B | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Non-English | 1215 | 1440 |
| LMArena Chinese | 1231 | 1481 |
| LMArena French | 1233 | 1477 |
| LMArena German | 1206 | 1463 |
| LMArena Japanese | 1150 | 1450 |
| LMArena Korean | 1140 | 1417 |
| LMArena Russian | 1236 | 1457 |
| LMArena Spanish | 1212 | 1442 |

## Instruction Following

- Gemini 1.5 Flash 8B: 63.1 (#231)
- Grok 4.20 (Non-Reasoning): 75.0 (#79)

| Benchmark | Gemini 1.5 Flash 8B | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Instruction Following | 1199 | 1420 |

## Long Context

- Gemini 1.5 Flash 8B: 36.9 (#220)
- Grok 4.20 (Non-Reasoning): 45.4 (#33)

| Benchmark | Gemini 1.5 Flash 8B | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Longer Query | 1219 | 1436 |
| CL-bench | — | 22.2% |
| CL-bench Life | — | 11.9% |

## Writing & Preference

- Gemini 1.5 Flash 8B: 43.0 (#227)
- Grok 4.20 (Non-Reasoning): 65.9 (#42)

| Benchmark | Gemini 1.5 Flash 8B | Grok 4.20 (Non-Reasoning) |
|---|---|---|
| LMArena Text | 1226 | 1451 |
| LMArena Creative Writing | 1218 | 1439 |
| LMArena Multi-Turn | 1185 | 1456 |
| EQ-Bench Creative Writing | — | 1574 |

## FAQ

### Is Gemini 1.5 Flash 8B better than Grok 4.20 (Non-Reasoning)?

Grok 4.20 (Non-Reasoning) is the stronger model overall, scoring 48.5 to 29.7 on the Noometry Index.

### Is Gemini 1.5 Flash 8B or Grok 4.20 (Non-Reasoning) better for coding?

Grok 4.20 (Non-Reasoning) scores higher on coding benchmarks: 41.8 versus 34.9 in the Noometry coding category.

### How many benchmarks do Gemini 1.5 Flash 8B and Grok 4.20 (Non-Reasoning) share?

21 benchmarks have published results for both models. Gemini 1.5 Flash 8B has 21 scored results on Noometry and Grok 4.20 (Non-Reasoning) has 46.