# Gemini 3 Flash vs Grok 4.5

> Side-by-side benchmark comparison for Gemini 3 Flash and Grok 4.5 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemini-3-flash-vs-grok-4-5
- Last updated: October 7, 2026

- Shared sourced benchmarks: 5
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Pick Grok 4.5 if you want the stronger benchmark profile. Gemini 3 Flash only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Grok 4.5 leads overall 63.97 to 54.55.
- The clearest category separation is in agentic, where the averages are 31.4 for Gemini 3 Flash and 57.6 for Grok 4.5.
- The biggest single benchmark swing is Terminal-Bench 2.1 (Vals) in Agentic, with scores of 53.9% and 67.8%.
- Gemini 3 Flash is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- Gemini 3 Flash also has the larger context window at 1M.

## Model Snapshot

| Property | Gemini 3 Flash | Grok 4.5 |
|----------|----------|----------|
| Creator | Google | xAI |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 1M | 500K |
| Overall Score | 54.55 | 63.97 |
| Benchmarks Covered | 11 | 17 |
| Pricing (input/output) | $0.50 / $3.00 | $2.00 / $6.00 |

## Category Breakdown

### Agentic

- Winner: Grok 4.5
- Gemini 3 Flash public-lane score: 31.4 (Supported · #82/122)
- Grok 4.5 public-lane score: 57.6 (Supported · #29/122)

| Benchmark | Gemini 3 Flash | Grok 4.5 | Winner |
|-----------|-----------|-----------|--------|
| Claw-Eval | 49.2% | Coming soon | Coming soon |
| Gert Labs | 56.63% | Coming soon | Coming soon |
| JobBench | 11.4% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 53.9% | 67.8% | Grok 4.5 |
| Terminal-Bench 3.0 | Coming soon | 15.7% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 83.3% | Coming soon |
| deepSwe | Coming soon | 53% | Coming soon |

### Coding

- Winner: Grok 4.5
- Gemini 3 Flash public-lane score: 34.2 (Supported · #85/146)
- Grok 4.5 public-lane score: 57.7 (Supported · #27/146)

| Benchmark | Gemini 3 Flash | Grok 4.5 | Winner |
|-----------|-----------|-----------|--------|
| Vibe Code Bench | 20.20% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 85.6% | 87.4% | Grok 4.5 |
| SWE-bench (Vals) | 75.0% | 86.6% | Grok 4.5 |
| SWE-bench Pro | Coming soon | 64.7% | Coming soon |
| SWE Multilingual | Coming soon | 78% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 83.3% | Coming soon |
| CursorBench 3.2 | Coming soon | 66.7% | Coming soon |
| VulcanBench v3 | Coming soon | 89.9% | Coming soon |
| PostTrainBench v1.1 | Coming soon | 23.4% | Coming soon |

### Reasoning

- Winner: Not comparable
- Gemini 3 Flash public-lane score: 60.3 (Unranked · 2 rankable rows)
- Grok 4.5 public-lane score: 50.4 (#28/28)

| Benchmark | Gemini 3 Flash | Grok 4.5 | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | Coming soon | 52.6% | Coming soon |
| ARC-AGI-3 | Coming soon | 0.3% | Coming soon |
| ARC-AGI-1 | Coming soon | 85.67% | Coming soon |

### Multimodal & Grounded

- Winner: Not comparable
- Gemini 3 Flash public-lane score: 76.9 (Unranked · 1 rankable row)
- Grok 4.5 public-lane score: 79.5 (Unranked · 1 rankable row)

### Knowledge

- Winner: Grok 4.5
- Gemini 3 Flash public-lane score: 53.6 (Supported · #57/174)
- Grok 4.5 public-lane score: 67 (Supported · #19/174)

| Benchmark | Gemini 3 Flash | Grok 4.5 | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 87.9% | 92.9% | Grok 4.5 |
| MMLU-Pro (Vals) | 88.6% | 89.2% | Grok 4.5 |

### Instruction Following

- Winner: Not comparable
- Gemini 3 Flash public-lane score: 64.7 (#70/125)
- Grok 4.5 public-lane score: Coming soon

### Mathematics

- Winner: Not comparable
- Gemini 3 Flash public-lane score: 50 (Unranked · 2 rankable rows)
- Grok 4.5 public-lane score: Coming soon

| Benchmark | Gemini 3 Flash | Grok 4.5 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 35.640% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 4.167% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Gemini 3 Flash or Grok 4.5?

Grok 4.5 is ahead overall on BenchLM right now.

### Where is the biggest gap between Gemini 3 Flash and Grok 4.5?

The widest category gap is in agentic, where the averages are 31.4 for Gemini 3 Flash and 57.6 for Grok 4.5.

### How many benchmarks does Gemini 3 Flash cover on BenchLM?

Gemini 3 Flash currently has 11 sourced benchmark scores on BenchLM.

### How many benchmarks does Grok 4.5 cover on BenchLM?

Grok 4.5 currently has 17 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Gemini 3 Flash vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-gemini-3-flash)
- [Grok 4.5 vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-grok-4-5)
- [Gemini 3 Flash vs GPT-6 Astra](/compare/gemini-3-flash-vs-gpt-6-astra)
- [Grok 4.5 vs GPT-6 Astra](/compare/gpt-6-astra-vs-grok-4-5)

## Explore More

- [Gemini 3 Flash profile](/models/gemini-3-flash)
- [Grok 4.5 profile](/models/grok-4-5)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)