# Gemini 3 Pro vs GPT-5.5 Pro

> Side-by-side benchmark comparison for Gemini 3 Pro and GPT-5.5 Pro across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gemini-3-pro-vs-gpt-5-5-pro
- Last updated: September 4, 2026

- Shared sourced benchmarks: 2
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Evidence is too thin for a benchmark verdict: Gemini 3 Pro and GPT-5.5 Pro share only 2 sourced benchmark rows.

## Summary

- Only 2 shared sourced benchmark rows are available. That is not enough for a broad capability verdict, so this mirror does not name an overall winner.
- Gemini 3 Pro has the lower published output-token price.
- Gemini 3 Pro has the larger published context window at 2M.

## Model Snapshot

| Property | Gemini 3 Pro | GPT-5.5 Pro |
|----------|----------|----------|
| Creator | Google | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 2M | 1M |
| Independent public score (not head-to-head) | 67.23 | 63.07 |
| Benchmarks Covered | 12 | 6 |
| Pricing (input/output) | $2.00 / $12.00 | $30.00 / $180.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Gemini 3 Pro public-lane score: 59.7 (Estimated · #30/151)
- GPT-5.5 Pro public-lane score: 60.6 (Estimated · #24/151)

| Benchmark | Gemini 3 Pro | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | 63.23% | Coming soon | Coming soon |
| JobBench | 11.4% | Coming soon | Coming soon |
| BrowseComp | Coming soon | 90.1% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- Gemini 3 Pro public-lane score: 60.9 (Estimated · #21/183)
- GPT-5.5 Pro public-lane score: Coming soon

| Benchmark | Gemini 3 Pro | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| Vibe Code Bench | 14.30% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- Gemini 3 Pro public-lane score: 74.2 (#17/48)
- GPT-5.5 Pro public-lane score: Coming soon

| Benchmark | Gemini 3 Pro | GPT-5.5 Pro | 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 |

### Reasoning

- Winner: Insufficient shared evidence
- Gemini 3 Pro public-lane score: 36.8 (Unranked · 3 rankable rows)
- GPT-5.5 Pro public-lane score: Coming soon

| Benchmark | Gemini 3 Pro | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 31.1% | Coming soon | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Gemini 3 Pro public-lane score: 65.3 (Estimated · #25/181)
- GPT-5.5 Pro public-lane score: 61.1 (Estimated · #36/181)

| Benchmark | Gemini 3 Pro | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| HLE | Coming soon | 57.2% | Coming soon |
| HLE w/o tools | Coming soon | 43.1% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- Gemini 3 Pro public-lane score: 85.8 (#38/120)
- GPT-5.5 Pro public-lane score: Coming soon

### Mathematics

- Winner: Insufficient shared evidence
- Gemini 3 Pro public-lane score: 55.4 (Unranked · 2 rankable rows)
- GPT-5.5 Pro public-lane score: 70.2 (Unranked · 3 rankable rows)

| Benchmark | Gemini 3 Pro | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath v2 (Tiers 1-3) | 37.600% | 51.000% | GPT-5.5 Pro |
| FrontierMath v2 (Tier 4) | 18.750% | 39.600% | GPT-5.5 Pro |
| FrontierMath (legacy) | Coming soon | 52.4% | Coming soon |

## FAQ

### Is there enough evidence to pick between Gemini 3 Pro and GPT-5.5 Pro?

Not yet. The models share only 2 sourced benchmark rows, 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)
- [GPT-5.5 Pro vs Gemini 3 Pro Deep Think](/compare/gemini-3-pro-deep-think-vs-gpt-5-5-pro)
- [Gemini 3 Pro vs GPT-5.5](/compare/gemini-3-pro-vs-gpt-5-5)
- [GPT-5.5 Pro vs GPT-5.5](/compare/gpt-5-5-vs-gpt-5-5-pro)

## Explore More

- [Gemini 3 Pro profile](/models/gemini-3-pro)
- [GPT-5.5 Pro profile](/models/gpt-5-5-pro)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)