# Gemini 3.5 Flash vs Grok 4.3

> Side-by-side benchmark comparison for Gemini 3.5 Flash and Grok 4.3 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemini-3-5-flash-vs-grok-4-3
- Last updated: October 2, 2026

- Shared sourced benchmarks: 7
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Pick Gemini 3.5 Flash if you want the stronger benchmark profile. Grok 4.3 only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- Gemini 3.5 Flash leads overall 63.95 to 55.35.
- The clearest category separation is in agentic, where the averages are 50.7 for Gemini 3.5 Flash and 26 for Grok 4.3.
- The biggest single benchmark swing is Terminal-Bench 2.1 (Vals) in Agentic, with scores of 74.2% and 41.9%.
- Grok 4.3 is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.

## Model Snapshot

| Property | Gemini 3.5 Flash | Grok 4.3 |
|----------|----------|----------|
| Creator | Google | xAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | 63.95 | 55.35 |
| Benchmarks Covered | 27 | 7 |
| Pricing (input/output) | $1.50 / $9.00 | $1.25 / $2.50 |

## Category Breakdown

### Agentic

- Winner: Gemini 3.5 Flash
- Gemini 3.5 Flash public-lane score: 50.7 (Supported · #42/119)
- Grok 4.3 public-lane score: 26 (Supported · #91/119)

| Benchmark | Gemini 3.5 Flash | Grok 4.3 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 76.2% | Coming soon | Coming soon |
| MCP Atlas | 83.6% | Coming soon | Coming soon |
| Toolathlon | 56.5% | Coming soon | Coming soon |
| OSWorld-Verified | 78.4% | Coming soon | Coming soon |
| Finance Agent v2 | 57.9% | Coming soon | Coming soon |
| Gert Labs | 61.85% | 43.86% | Gemini 3.5 Flash |
| ResearchClawBench | 18.0% | 12.4% | Gemini 3.5 Flash |
| Terminal-Bench 2.1 (Vals) | 74.2% | 41.9% | Gemini 3.5 Flash |

### Coding

- Winner: Gemini 3.5 Flash
- Gemini 3.5 Flash public-lane score: 52.3 (Supported · #39/144)
- Grok 4.3 public-lane score: 29.4 (Supported · #96/144)

| Benchmark | Gemini 3.5 Flash | Grok 4.3 | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.1 | 76.2% | Coming soon | Coming soon |
| SWE-bench Pro | 55.1% | Coming soon | Coming soon |
| Vibe Code Bench | 48.68% | Coming soon | Coming soon |
| cursorBench31 | 49.8% | Coming soon | Coming soon |
| CursorBench 3.2 | 48.8% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 87.6% | 84.5% | Gemini 3.5 Flash |
| SWE-bench (Vals) | 78.8% | 71.4% | Gemini 3.5 Flash |

### Reasoning

- Winner: Not comparable
- Gemini 3.5 Flash public-lane score: 62.8 (#20/27)
- Grok 4.3 public-lane score: 66.5 (Unranked · 2 rankable rows)

| Benchmark | Gemini 3.5 Flash | Grok 4.3 | Winner |
|-----------|-----------|-----------|--------|
| MRCRv2 | 77.3% | Coming soon | Coming soon |
| MRCR 1M | 26.6% | Coming soon | Coming soon |
| ARC-AGI-2 | 72.1% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Directional only
- Gemini 3.5 Flash public-lane score: 87.8 (#6/49)
- Grok 4.3 public-lane score: 66.7 (#25/49)

| Benchmark | Gemini 3.5 Flash | Grok 4.3 | Winner |
|-----------|-----------|-----------|--------|
| CharXiv | 84.2% | Coming soon | Coming soon |
| MMMU-Pro | 83.6% | Coming soon | Coming soon |
| Blueprint-Bench 2 | 33.6% | Coming soon | Coming soon |

### Knowledge

- Winner: Gemini 3.5 Flash
- Gemini 3.5 Flash public-lane score: 64 (Supported · #30/171)
- Grok 4.3 public-lane score: 53.6 (Supported · #56/171)

| Benchmark | Gemini 3.5 Flash | Grok 4.3 | Winner |
|-----------|-----------|-----------|--------|
| GPQA-D | 92.7% | Coming soon | Coming soon |
| HLE | 40.2% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 92.7% | 91.4% | Gemini 3.5 Flash |
| MMLU-Pro (Vals) | 89.5% | 85.8% | Gemini 3.5 Flash |

### Instruction Following

- Winner: Directional only
- Gemini 3.5 Flash public-lane score: 84.1 (#43/125)
- Grok 4.3 public-lane score: 93.2 (#2/125)

### Mathematics

- Winner: Not comparable
- Gemini 3.5 Flash public-lane score: 55.1 (Unranked · 2 rankable rows)
- Grok 4.3 public-lane score: Coming soon

| Benchmark | Gemini 3.5 Flash | Grok 4.3 | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 38.966% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 14.583% | Coming soon | Coming soon |

## FAQ

### Which is better overall, Gemini 3.5 Flash or Grok 4.3?

Gemini 3.5 Flash is ahead overall on BenchLM right now.

### Where is the biggest gap between Gemini 3.5 Flash and Grok 4.3?

The widest category gap is in agentic, where the averages are 50.7 for Gemini 3.5 Flash and 26 for Grok 4.3.

### How many benchmarks does Gemini 3.5 Flash cover on BenchLM?

Gemini 3.5 Flash currently has 27 sourced benchmark scores on BenchLM.

### How many benchmarks does Grok 4.3 cover on BenchLM?

Grok 4.3 currently has 7 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Gemini 3.5 Flash vs Gemini 3.5 Flash Cyber](/compare/gemini-3-5-flash-vs-gemini-3-5-flash-cyber)
- [Grok 4.3 vs Gemini 3.5 Flash Cyber](/compare/gemini-3-5-flash-cyber-vs-grok-4-3)
- [Gemini 3.5 Flash vs GPT-6 Astra](/compare/gemini-3-5-flash-vs-gpt-6-astra)
- [Grok 4.3 vs GPT-6 Astra](/compare/gpt-6-astra-vs-grok-4-3)

## Explore More

- [Gemini 3.5 Flash profile](/models/gemini-3-5-flash)
- [Grok 4.3 profile](/models/grok-4-3)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)