Grok 4.20 vs GPT-5.5 Pro

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

	Grok 4.20	GPT-5.5 Pro
Intelligence	90	98
Speed	88	45

xAI's newest flagship model with industry-leading speed, agentic tool calling, and optional reasoning. Combines low hallucination rate with strict prompt adherence.

✓ reasoning
✓ temperature
✓ web search
✓ vision
✓ documents

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

Run the same prompt on both, side by side

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