GPT-5.5 Pro vs Gemini 3.1 Pro: which is better?

GPT-5.5 Pro (OpenAI) and Gemini 3.1 Pro (Google) differ in intelligence, speed, and capabilities — see the comparison table for details, or run both live in EVA.

GPT-5.5 Pro vs Gemini 3.1 Pro

OpenAI vs Google — compared on intelligence, speed, and capabilities.

	GPT-5.5 Pro	Gemini 3.1 Pro
Intelligence	98	92
Speed	45	68

GPT-5.5 Pro

Maximum-performance version of GPT-5.5 using more compute to think harder and provide consistently better answers. The most capable and accurate model in the GPT-5.5 family.

✓ reasoning
✓ web search
✓ reasoning effort
✓ vision
✓ documents

Gemini 3.1 Pro

Refined Gemini 3 Pro with better thinking, improved token efficiency, and enhanced factual consistency. Optimized for software engineering behavior, agentic workflows, and precise multi-step execution across real-world domains.

✓ reasoning
✓ temperature
✓ web search
✓ reasoning effort
✓ vision
✓ video input
✓ audio input
✓ documents

Run the same prompt on both, side by side