# Gemini 3.5 Flash vs Grok 4.5

> Gemini 3.5 Flash and Grok 4.5 score almost the same on the Noometry Index (54.1 vs 55.0), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/gemini-3-5-flash-vs-grok-4-5
- Last updated: 2026-10-10
- Shared benchmarks: 45

## Summary

- They share 45 benchmarks with published results for both. Gemini 3.5 Flash scores higher in 6 categories and Grok 4.5 in 4 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in agentic & tool use, where Grok 4.5 leads 44.4 to 24.8.
- The biggest single-benchmark swing is GBAEval: 6.7% for Gemini 3.5 Flash and 65.4% for Grok 4.5.
- Grok 4.5 is cheaper at $2 / $6 per million input/output tokens, against $1.50 / $9 for Gemini 3.5 Flash.
- Gemini 3.5 Flash accepts more context: 1.05M tokens versus 500K.

## Snapshot

| | Gemini 3.5 Flash | Grok 4.5 |
|---|---|---|
| Provider | Google | xAI |
| Noometry Index | 54.1 | 55.0 |
| Rank | 29 | 22 |
| Context | 1.05M | 500K |
| Input $/M | $1.50 | $2 |
| Output $/M | $9 | $6 |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 3.5 Flash: 49.1 (#46)
- Grok 4.5: 51.7 (#34)

| Benchmark | Gemini 3.5 Flash | Grok 4.5 |
|---|---|---|
| DeepSWE | 37.4% | 53.8% |
| LMArena WebDev | 1499 | 1552 |
| SciCode | 53.1% | 54.1% |
| WeirdML | 62.6% | 46.4% |
| LMArena Coding | 1492 | 1473 |
| ALE-Bench | 911.02 | 1,309 |
| SWE-bench Verified | 79.3% | — |
| FrontierCode | — | 42.4% |

## Agentic & Tool Use

- Gemini 3.5 Flash: 24.8 (#107)
- Grok 4.5: 44.4 (#15)

| Benchmark | Gemini 3.5 Flash | Grok 4.5 |
|---|---|---|
| APEX-Agents | 27.5% | 56.2% |
| GBAEval | 6.7% | 65.4% |
| GDP.pdf | 14% | 14% |
| Vending-Bench 2 | 5,396 | 3,887 |
| τ²-bench Banking | — | 47.9% |
| PostTrainBench | — | 23.4% |
| LMArena Search | — | 1213 |

## Reasoning

- Gemini 3.5 Flash: 62.7 (#16)
- Grok 4.5: 56.0 (#23)

| Benchmark | Gemini 3.5 Flash | Grok 4.5 |
|---|---|---|
| ARC-AGI-2 | 72.1% | 52.6% |
| SimpleBench | 76.7% | 70% |
| NYT Connections (extended) | 92.6% | 79.9% |
| ARC-AGI-1 | 92.5% | 87.2% |
| CritPt | 13.1% | 15.4% |
| Chess Puzzles | 50% | 36% |
| LMArena Hard Prompts | 1488 | 1462 |
| DTBench | 94.7% | 96.5% |
| LMCA | 47.1% | 45.2% |
| Surface Evolver Bench | 58.1% | 74.4% |
| Epoch Capabilities Index | 154.55 | 154.02 |
| Kagi LLM Benchmark | — | 83.5% |
| EnigmaEval | 25.4% | — |
| EBR-Bench | 4.8% | — |
| Mystery Game Puzzles | 32% | — |
| ForecastBench | 59 | — |

## Math

- Gemini 3.5 Flash: 60.5 (#30)
- Grok 4.5: 60.7 (#29)

| Benchmark | Gemini 3.5 Flash | Grok 4.5 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 62.8% | 57.2% |
| FrontierMath Tier 4 | 26.8% | 24.4% |
| OTIS Mock AIME 2024-2025 | 95.6% | 97.8% |
| ProofBench | 31% | 31% |
| LMArena Math | 1502 | 1457 |
| MathArena Final-Answer Competitions | 76.3% | — |
| FrontierMath (Feb 2025 set) | 39% | — |
| FrontierMath Tier 4 (v1) | 14.6% | — |

## Knowledge

- Gemini 3.5 Flash: 66.3 (#10)
- Grok 4.5: 62.3 (#21)

| Benchmark | Gemini 3.5 Flash | Grok 4.5 |
|---|---|---|
| GPQA Diamond | 92.8% | 93.4% |
| SimpleQA Verified | 66.2% | 48.3% |
| LMArena Expert | 1493 | 1466 |

## Multimodal

- Gemini 3.5 Flash: 45.7 (#13)
- Grok 4.5: 37.8 (#63)

| Benchmark | Gemini 3.5 Flash | Grok 4.5 |
|---|---|---|
| LMArena Vision | 1311 | 1287 |
| Blueprint-Bench 2 | 33.6% | 27.3% |
| LMArena Document | 1463 | 1452 |
| Furniture Assembly | — | 22.5% |

## Multilingual

- Gemini 3.5 Flash: 57.1 (#12)
- Grok 4.5: 54.5 (#43)

| Benchmark | Gemini 3.5 Flash | Grok 4.5 |
|---|---|---|
| LMArena Non-English | 1475 | 1439 |
| LMArena Chinese | 1525 | 1497 |
| LMArena French | 1490 | 1458 |
| LMArena German | 1500 | 1448 |
| LMArena Japanese | 1481 | 1425 |
| LMArena Korean | 1453 | 1402 |
| LMArena Russian | 1491 | 1447 |
| LMArena Spanish | 1478 | 1452 |

## Instruction Following

- Gemini 3.5 Flash: 77.2 (#29)
- Grok 4.5: 76.3 (#45)

| Benchmark | Gemini 3.5 Flash | Grok 4.5 |
|---|---|---|
| LMArena Instruction Following | 1466 | 1446 |

## Long Context

- Gemini 3.5 Flash: 45.3 (#39)
- Grok 4.5: 44.8 (#54)

| Benchmark | Gemini 3.5 Flash | Grok 4.5 |
|---|---|---|
| LMArena Longer Query | 1481 | 1463 |

## Writing & Preference

- Gemini 3.5 Flash: 65.5 (#46)
- Grok 4.5: 65.9 (#40)

| Benchmark | Gemini 3.5 Flash | Grok 4.5 |
|---|---|---|
| LMArena Text | 1481 | 1448 |
| LMArena Creative Writing | 1467 | 1442 |
| LMArena Multi-Turn | 1482 | 1457 |
| EQ-Bench Creative Writing | — | 1579 |
| EQ-Bench 4 | 1087 | — |

## FAQ

### Is Gemini 3.5 Flash better than Grok 4.5?

Gemini 3.5 Flash and Grok 4.5 score almost the same on the Noometry Index (54.1 vs 55.0), so choose on price, context window or the category you care about most.

### Which is cheaper, Gemini 3.5 Flash or Grok 4.5?

Grok 4.5 is cheaper. It lists at $2 per million input tokens and $6 per million output tokens; Gemini 3.5 Flash lists at $1.50 and $9.

### Is Gemini 3.5 Flash or Grok 4.5 better for coding?

Grok 4.5 scores higher on coding benchmarks: 51.7 versus 49.1 in the Noometry coding category.

### Which has the bigger context window?

Gemini 3.5 Flash does, with 1.05M tokens against 500K.

### How many benchmarks do Gemini 3.5 Flash and Grok 4.5 share?

45 benchmarks have published results for both models. Gemini 3.5 Flash has 54 scored results on Noometry and Grok 4.5 has 52.