# Gemini 3 Flash vs Grok 4.3

> Side-by-side benchmark comparison for Gemini 3 Flash and Grok 4.3 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemini-3-flash-vs-grok-4-3
- Last updated: September 10, 2026

- Shared sourced benchmarks: 6
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Pick Gemini 3 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 Flash leads overall 62.2 to 59.73.
- The clearest category separation is in instruction following, where the averages are 66.2 for Gemini 3 Flash and 94.4 for Grok 4.3.
- The biggest single benchmark swing is Gert Labs in Agentic, with scores of 56.63% and 43.86%.
- 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 Flash | Grok 4.3 |
|----------|----------|----------|
| Creator | Google | xAI |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 1M | 1M |
| Overall Score | 62.2 | 59.73 |
| Benchmarks Covered | 11 | 7 |
| Pricing (input/output) | $0.50 / $3.00 | $1.25 / $2.50 |

## Category Breakdown

### Agentic

- Winner: Gemini 3 Flash
- Gemini 3 Flash public-lane score: 34 (Supported · #134/152)
- Grok 4.3 public-lane score: 26.9 (Supported · #144/152)

| Benchmark | Gemini 3 Flash | Grok 4.3 | Winner |
|-----------|-----------|-----------|--------|
| Claw-Eval | 49.2% | Coming soon | Coming soon |
| Gert Labs | 56.63% | 43.86% | Gemini 3 Flash |
| JobBench | 11.4% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 53.9% | 41.9% | Gemini 3 Flash |
| ResearchClawBench | Coming soon | 12.4% | Coming soon |

### Coding

- Winner: Gemini 3 Flash
- Gemini 3 Flash public-lane score: 41.5 (Supported · #108/151)
- Grok 4.3 public-lane score: 33.6 (Supported · #131/151)

| Benchmark | Gemini 3 Flash | Grok 4.3 | Winner |
|-----------|-----------|-----------|--------|
| Vibe Code Bench | 20.20% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 85.6% | 84.5% | Gemini 3 Flash |
| SWE-bench (Vals) | 75.0% | 71.4% | Gemini 3 Flash |

### Multimodal & Grounded

- Winner: Coming soon
- Gemini 3 Flash public-lane score: 75.8 (Unranked · 1 rankable row)
- Grok 4.3 public-lane score: 65.6 (#25/48)

### Reasoning

- Winner: Coming soon
- Gemini 3 Flash public-lane score: 59 (Unranked · 2 rankable rows)
- Grok 4.3 public-lane score: 65.2 (Unranked · 2 rankable rows)

### Knowledge

- Winner: Tie
- Gemini 3 Flash public-lane score: 56.9 (Supported · #45/183)
- Grok 4.3 public-lane score: 57 (Supported · #44/183)

| Benchmark | Gemini 3 Flash | Grok 4.3 | Winner |
|-----------|-----------|-----------|--------|
| GPQA Diamond (Vals) | 87.9% | 91.4% | Grok 4.3 |
| MMLU-Pro (Vals) | 88.6% | 85.8% | Gemini 3 Flash |

### Instruction Following

- Winner: Coming soon
- Gemini 3 Flash public-lane score: 66.2 (#68/123)
- Grok 4.3 public-lane score: 94.4 (#2/123)

### Mathematics

- Winner: Coming soon
- Gemini 3 Flash public-lane score: 50.2 (Unranked · 2 rankable rows)
- Grok 4.3 public-lane score: Coming soon

| Benchmark | Gemini 3 Flash | Grok 4.3 | 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 4.3?

Gemini 3 Flash is ahead overall on BenchLM right now.

### Where is the biggest gap between Gemini 3 Flash and Grok 4.3?

The widest category gap is in instruction following, where the averages are 66.2 for Gemini 3 Flash and 94.4 for Grok 4.3.

### 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 4.3 cover on BenchLM?

Grok 4.3 currently has 7 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Gemini 3 Flash vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-gemini-3-flash)
- [Grok 4.3 vs Claude Fable 5.1](/compare/claude-fable-5-1-vs-grok-4-3)
- [Gemini 3 Flash vs GPT-6 Astra](/compare/gemini-3-flash-vs-gpt-6-astra)
- [Grok 4.3 vs GPT-6 Astra](/compare/gpt-6-astra-vs-grok-4-3)

## Explore More

- [Gemini 3 Flash profile](/models/gemini-3-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)