# Gemini 3 Flash Preview vs Grok 4.5

> Grok 4.5 is the stronger model overall, scoring 55.0 to 52.3 on the Noometry Index. Gemini 3 Flash Preview costs 2.7× less per token, which makes it the better buy when Grok 4.5's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gemini-3-flash-preview-vs-grok-4-5
- Last updated: 2026-10-10
- Shared benchmarks: 41

## Summary

- They share 41 benchmarks with published results for both. Gemini 3 Flash Preview scores higher in 2 categories and Grok 4.5 in 8 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in math, where Grok 4.5 leads 60.9 to 51.7.
- The biggest single-benchmark swing is Blueprint-Bench 2: 0% for Gemini 3 Flash Preview and 27.3% for Grok 4.5.
- Gemini 3 Flash Preview is cheaper at $0.50 / $3 per million input/output tokens, against $2 / $6 for Grok 4.5.
- Gemini 3 Flash Preview accepts more context: 1.05M tokens versus 500K.

## Snapshot

| | Gemini 3 Flash Preview | Grok 4.5 |
|---|---|---|
| Provider | Google | xAI |
| Noometry Index | 52.3 | 55.0 |
| Rank | 40 | 25 |
| Context | 1.05M | 500K |
| Input $/M | $0.50 | $2 |
| Output $/M | $3 | $6 |
| Weights | Proprietary | Proprietary |

## Coding

- Gemini 3 Flash Preview: 50.9 (#42)
- Grok 4.5: 52.2 (#35)

| Benchmark | Gemini 3 Flash Preview | Grok 4.5 |
|---|---|---|
| LMArena WebDev | 1439 | 1553 |
| WeirdML | 61.6% | 46.4% |
| LMArena Coding | 1460 | 1474 |
| ALE-Bench | 1,367 | 1,309 |
| SWE-bench Verified | 75.4% | — |
| DeepSWE | — | 53.8% |
| FrontierCode | — | 42.4% |
| SWE-bench Verified (bash only) | 75.8% | — |
| SWE-bench Multilingual | 72.7% | — |
| SciCode | — | 54.1% |
| GSO | 9.8% | — |

## Agentic & Tool Use

- Gemini 3 Flash Preview: 38.7 (#29)
- Grok 4.5: 44.4 (#17)

| Benchmark | Gemini 3 Flash Preview | Grok 4.5 |
|---|---|---|
| τ²-bench Banking | 27.3% | 47.9% |
| GDP.pdf | 10% | 14% |
| LMArena Search | 1198 | 1213 |
| Vending-Bench 2 | 3,635 | 3,887 |
| Terminal-Bench | 64.3% | — |
| APEX-Agents | — | 56.2% |
| τ²-bench Airline | 82.5% | — |
| τ²-bench Retail | 76.8% | — |
| τ²-bench Telecom | 91.2% | — |
| DeepResearch Bench | 49.8% | — |
| PostTrainBench | — | 23.4% |
| BALROG | 48.1% | — |
| GBAEval | — | 65.4% |

## Reasoning

- Gemini 3 Flash Preview: 49.2 (#37)
- Grok 4.5: 56.1 (#25)

| Benchmark | Gemini 3 Flash Preview | Grok 4.5 |
|---|---|---|
| ARC-AGI-2 | 33.6% | 52.6% |
| SimpleBench | 61.1% | 70% |
| NYT Connections (extended) | 83.1% | 79.9% |
| ARC-AGI-1 | 84.7% | 87.2% |
| Chess Puzzles | 40% | 36% |
| LMArena Hard Prompts | 1465 | 1462 |
| DTBench | 89.1% | 96.5% |
| LMCA | 43.1% | 45.2% |
| Epoch Capabilities Index | 151.8 | 153.92 |
| Kagi LLM Benchmark | — | 83.5% |
| CritPt | — | 15.4% |
| Mystery Game Puzzles | 26% | — |
| Surface Evolver Bench | — | 74.4% |
| ForecastBench | 58.5 | — |

## Math

- Gemini 3 Flash Preview: 51.7 (#55)
- Grok 4.5: 60.9 (#35)

| Benchmark | Gemini 3 Flash Preview | Grok 4.5 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 51.2% | 57.2% |
| FrontierMath Tier 4 | 17.1% | 24.4% |
| OTIS Mock AIME 2024-2025 | 95.6% | 97.8% |
| ProofBench | 15% | 31% |
| LMArena Math | 1473 | 1459 |
| MathArena Final-Answer Competitions | 67.6% | — |
| FrontierMath (Feb 2025 set) | 35.6% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |

## Knowledge

- Gemini 3 Flash Preview: 58.8 (#33)
- Grok 4.5: 62.3 (#24)

| Benchmark | Gemini 3 Flash Preview | Grok 4.5 |
|---|---|---|
| GPQA Diamond | 89.4% | 93.4% |
| SimpleQA Verified | 66.8% | 48.3% |
| LMArena Expert | 1462 | 1466 |
| Vectara Hallucination Rate | 13.5% | — |

## Multimodal

- Gemini 3 Flash Preview: 45.5 (#16)
- Grok 4.5: 37.6 (#72)

| Benchmark | Gemini 3 Flash Preview | Grok 4.5 |
|---|---|---|
| LMArena Vision | 1285 | 1288 |
| Blueprint-Bench 2 | 0% | 27.3% |
| LMArena Document | 1413 | 1452 |
| GeoBench | 88% | — |
| VPCT | 72.6% | — |
| Furniture Assembly | — | 22.5% |

## Multilingual

- Gemini 3 Flash Preview: 55.7 (#27)
- Grok 4.5: 54.4 (#42)

| Benchmark | Gemini 3 Flash Preview | Grok 4.5 |
|---|---|---|
| LMArena Non-English | 1458 | 1440 |
| LMArena Chinese | 1511 | 1496 |
| LMArena French | 1477 | 1456 |
| LMArena German | 1497 | 1446 |
| LMArena Japanese | 1489 | 1428 |
| LMArena Korean | 1443 | 1404 |
| LMArena Russian | 1480 | 1448 |
| LMArena Spanish | 1469 | 1450 |

## Instruction Following

- Gemini 3 Flash Preview: 75.7 (#56)
- Grok 4.5: 76.0 (#48)

| Benchmark | Gemini 3 Flash Preview | Grok 4.5 |
|---|---|---|
| LMArena Instruction Following | 1437 | 1446 |

## Long Context

- Gemini 3 Flash Preview: 44.4 (#67)
- Grok 4.5: 44.8 (#56)

| Benchmark | Gemini 3 Flash Preview | Grok 4.5 |
|---|---|---|
| LMArena Longer Query | 1452 | 1463 |

## Writing & Preference

- Gemini 3 Flash Preview: 65.5 (#45)
- Grok 4.5: 65.8 (#42)

| Benchmark | Gemini 3 Flash Preview | Grok 4.5 |
|---|---|---|
| LMArena Text | 1466 | 1448 |
| LMArena Creative Writing | 1457 | 1442 |
| LMArena Multi-Turn | 1471 | 1456 |
| EQ-Bench Creative Writing | — | 1579 |

## FAQ

### Is Gemini 3 Flash Preview better than Grok 4.5?

Grok 4.5 is the stronger model overall, scoring 55.0 to 52.3 on the Noometry Index. Gemini 3 Flash Preview costs 2.7× less per token, which makes it the better buy when Grok 4.5's lead doesn't matter for your workload.

### Which is cheaper, Gemini 3 Flash Preview or Grok 4.5?

Gemini 3 Flash Preview is cheaper. It lists at $0.50 per million input tokens and $3 per million output tokens; Grok 4.5 lists at $2 and $6.

### Is Gemini 3 Flash Preview or Grok 4.5 better for coding?

Grok 4.5 scores higher on coding benchmarks: 52.2 versus 50.9 in the Noometry coding category.

### Which has the bigger context window?

Gemini 3 Flash Preview does, with 1.05M tokens against 500K.

### How many benchmarks do Gemini 3 Flash Preview and Grok 4.5 share?

41 benchmarks have published results for both models. Gemini 3 Flash Preview has 59 scored results on Noometry and Grok 4.5 has 52.