# Gemini 3 Pro Deep Think vs GPT-5.5 Pro

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

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

- Shared sourced benchmarks: 0
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

No benchmark verdict yet: there is no shared sourced benchmark row for Gemini 3 Pro Deep Think and GPT-5.5 Pro.

## Summary

- Gemini 3 Pro Deep Think and GPT-5.5 Pro do not currently share a sourced benchmark row. The mirror therefore compares metadata, pricing, context windows, and each model's separately reported coverage without naming a benchmark winner.

## Model Snapshot

| Property | Gemini 3 Pro Deep Think | GPT-5.5 Pro |
|----------|----------|----------|
| Creator | Google | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 2M | 1M |
| Independent public score (not head-to-head) | 60.67 | 63.07 |
| Benchmarks Covered | 1 | 6 |
| Pricing (input/output) | Pricing unavailable / Pricing unavailable | $30.00 / $180.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- Gemini 3 Pro Deep Think public-lane score: Coming soon
- GPT-5.5 Pro public-lane score: 60.6 (Estimated · #24/151)

| Benchmark | Gemini 3 Pro Deep Think | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| BrowseComp | Coming soon | 90.1% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- Gemini 3 Pro Deep Think public-lane score: 32.8 (Unranked · 1 rankable row)
- GPT-5.5 Pro public-lane score: Coming soon

| Benchmark | Gemini 3 Pro Deep Think | GPT-5.5 Pro | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 45.1% | Coming soon | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- Gemini 3 Pro Deep Think public-lane score: Coming soon
- GPT-5.5 Pro public-lane score: 61.1 (Estimated · #36/181)

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

### Mathematics

- Winner: Insufficient shared evidence
- Gemini 3 Pro Deep Think public-lane score: Coming soon
- GPT-5.5 Pro public-lane score: 70.2 (Unranked · 3 rankable rows)

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

## FAQ

### Can I compare Gemini 3 Pro Deep Think and GPT-5.5 Pro on BenchLM yet?

Not fully yet. BenchLM is tracking both models, but sourced benchmark coverage is still incomplete for a fair score-level comparison.

### Why does this page show "coming soon" values?

BenchLM only calls winners when public benchmark coverage is available on both sides of the comparison.

## Related Comparisons

- [Gemini 3 Pro Deep Think vs Gemini 3 Pro](/compare/gemini-3-pro-vs-gemini-3-pro-deep-think)
- [GPT-5.5 Pro vs Gemini 3 Pro](/compare/gemini-3-pro-vs-gpt-5-5-pro)
- [Gemini 3 Pro Deep Think vs GPT-5.5](/compare/gemini-3-pro-deep-think-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 Deep Think profile](/models/gemini-3-pro-deep-think)
- [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)