GPT-1 vs Grok 4.3

OpenAI vs xAI — benchmarks, pricing, and capabilities side by side.

•Grok 4.3 has a larger context window (1M)

	GPT-1	Grok 4.3
Intelligence index	—	90.1
Developer	OpenAI	xAI
Type	LLM	LLM
Access	Open weights	API only
Context window	512 tokens	1,000,000 tokens
Input price	—	$1.25 / 1M
Output price	—	$2.50 / 1M
Speed	—	88 tok/s
Released	June 11, 2018	May 6, 2026
Parameters	117M	—
Input modalities	Text	Text, Image
Output modalities	Text	Text

GPT-1 details Grok 4.3 details