Gemini 3.1 Pro vs GPT-5.5
Side-by-side comparison of Google's Gemini 3.1 Pro and OpenAI's GPT-5.5. Which one is right for you?
Benchmark Comparison
Coding
GPT-5.5 wins89
94
Reasoning
GPT-5.5 wins92
96
Multimodal
Gemini 3.1 Pro wins98
97
Speed
Gemini 3.1 Pro wins90
82
Overall
GPT-5.5 wins92
93
Pricing Comparison
Gemini 3.1 Pro
API Input$3.50/1M
API Output$14.00/1M
Subscription$20/mo
Free tierYes
GPT-5.5
API Input$5.00/1M
API Output$30.00/1M
Subscription$20/mo
Free tierYes
Specifications
| Spec | Gemini 3.1 Pro | GPT-5.5 |
|---|---|---|
| Provider | OpenAI | |
| Released | 2026-04 | 2026-03 |
| Category | Frontier | Frontier |
| Context Window | 2M | 1M |
| Open Source | No | No |
| Multimodal | Yes | Yes |
| Best For | Multimodal, Multilingual, Large context | General purpose, Computer use, Autonomous agents |
Gemini 3.1 Pro
Largest context window
Best multimodal capabilities
Fast
Occasionally hallucinates
Weaker on coding than Claude
GPT-5.5
Best all-rounder
Strong at autonomous tasks
Large context window
Expensive API
Rate limits on free tier