Codex vs Grok 4.3

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

	Codex	Grok 4.3
Intelligence index	—	90.1
Developer	OpenAI	xAI
Type	LLM	LLM
Access	API only	API only
Context window	—	1,000,000 tokens
Input price	—	$1.25 / 1M
Output price	—	$2.50 / 1M
Speed	—	88 tok/s
Released	August 10, 2021	May 6, 2026
Parameters	—	—
Input modalities	Text	Text, Image
Output modalities	Text	Text

Codex details Grok 4.3 details