GPT-5.1 (thinking) vs Gemini 3 Pro
Detailed comparison of capabilities, features, and performance.
Feature
GPT-5.1 (thinking)
Gemini 3 Pro
Model Image
AI Lab
OpenAI
Google
Context Size
400,000 tokens
1,048,756 tokens
Max Output Size
128,000 tokens
65,535 tokens
Frontier Model
Yes
Yes
Vision Support
Yes
Yes
Description
OpenAI's flagship model for coding, reasoning, and agentic tasks across domains. Thinking set to maximum.
Gemini 3 Pro: Google's most advanced AI model combining breakthrough reasoning depth, native multimodal understanding, and state-of-the-art agentic capabilities to help you learn, build, and plan anything
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