# Gemini 3 Pro vs Grok 4 Fast (Reasoning)

> Side-by-side benchmark comparison for Gemini 3 Pro and Grok 4 Fast (Reasoning) across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemini-3-pro-vs-grok-4-fast-reasoning
- Last updated: September 29, 2026

- Shared sourced benchmarks: 1
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Evidence is too thin for a benchmark verdict: Gemini 3 Pro and Grok 4 Fast (Reasoning) share only 1 sourced benchmark row.

## Summary

- Only 1 shared sourced benchmark row is available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.

## Model Snapshot

| Property | Gemini 3 Pro | Grok 4 Fast (Reasoning) |
|----------|----------|----------|
| Creator | Google | xAI |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 2M | 2M |
| Independent public score (not head-to-head) | 60.82 | 42.24 |
| Benchmarks Covered | 12 | 1 |
| Pricing (input/output) | $2.00 / $12.00 | N/A |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Gemini 3 Pro public-lane score: Coming soon
- Grok 4 Fast (Reasoning) public-lane score: Coming soon

| Benchmark | Gemini 3 Pro | Grok 4 Fast (Reasoning) | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | 63.23% | Coming soon | Coming soon |
| JobBench | 11.4% | Coming soon | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Gemini 3 Pro public-lane score: 45 (Estimated · #53/143)
- Grok 4 Fast (Reasoning) public-lane score: 23.3 (Estimated · #113/143)

| Benchmark | Gemini 3 Pro | Grok 4 Fast (Reasoning) | Winner |
|-----------|-----------|-----------|--------|
| Vibe Code Bench | 14.30% | 0.00% | Gemini 3 Pro |

### Reasoning

- Winner: Insufficient shared evidence
- Gemini 3 Pro public-lane score: 46.5 (Unranked · 3 rankable rows)
- Grok 4 Fast (Reasoning) public-lane score: 73 (Unranked · 2 rankable rows)

| Benchmark | Gemini 3 Pro | Grok 4 Fast (Reasoning) | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 31.1% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Gemini 3 Pro public-lane score: 75.2 (#18/50)
- Grok 4 Fast (Reasoning) public-lane score: 52.2 (Unranked · 1 rankable row)

| Benchmark | Gemini 3 Pro | Grok 4 Fast (Reasoning) | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 81% | Coming soon | Coming soon |
| MathVision | 86.6% | Coming soon | Coming soon |
| VideoMMMU | 87.6% | Coming soon | Coming soon |
| ScreenSpot Pro | 72.7% | Coming soon | Coming soon |
| CharXiv | 81.4% | Coming soon | Coming soon |
| V* | 88.0% | Coming soon | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Gemini 3 Pro public-lane score: 58.6 (Estimated · #42/169)
- Grok 4 Fast (Reasoning) public-lane score: 39.7 (Estimated · #100/169)

### Instruction Following

- Winner: Insufficient shared evidence
- Gemini 3 Pro public-lane score: 84.7 (#39/124)
- Grok 4 Fast (Reasoning) public-lane score: 58.7 (#74/124)

### Mathematics

- Winner: Insufficient shared evidence
- Gemini 3 Pro public-lane score: 55.2 (Unranked · 2 rankable rows)
- Grok 4 Fast (Reasoning) public-lane score: Coming soon

| Benchmark | Gemini 3 Pro | Grok 4 Fast (Reasoning) | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 37.600% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 18.750% | Coming soon | Coming soon |

## FAQ

### Is there enough evidence to pick between Gemini 3 Pro and Grok 4 Fast (Reasoning)?

Not yet. The models share only 1 sourced benchmark row, so this mirror reports the available measurements and metadata without naming a broad winner.

### What can I compare safely on this page?

Published pricing, context windows, model type, and individual shared benchmark rows are directly comparable. Independent overall scores and non-overlapping benchmark coverage are labeled separately and should not be read as a controlled head-to-head result.

## Related Comparisons

- [Gemini 3 Pro vs Gemini 3 Pro Deep Think](/compare/gemini-3-pro-vs-gemini-3-pro-deep-think)
- [Grok 4 Fast (Reasoning) vs Gemini 3 Pro Deep Think](/compare/gemini-3-pro-deep-think-vs-grok-4-fast-reasoning)
- [Gemini 3 Pro vs GPT-6 Astra](/compare/gemini-3-pro-vs-gpt-6-astra)
- [Grok 4 Fast (Reasoning) vs GPT-6 Astra](/compare/gpt-6-astra-vs-grok-4-fast-reasoning)

## Explore More

- [Gemini 3 Pro profile](/models/gemini-3-pro)
- [Grok 4 Fast (Reasoning) profile](/models/grok-4-fast-reasoning)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)