Claude Code Max 20x vs OpenAI Codex Pro limits

	Claude Code Max 20x	OpenAI Codex Pro
Price	$200/mo	$100, $200 or $500/mo tiers
Stated limits	20x Pro per-session usage; weekly limit across all models; exact count not disclosed. Fable capped at 50% of weekly limits. $200/mo API credits	No 5-hour limit currently; weekly limit amounts not disclosed on pricing page. Ultrafast mode on Pro $500
Window	5-hour + weekly	Weekly (5-hour currently off)
Models	Fable, Opus, Sonnet, Haiku	GPT-6.1 Sol, GPT-6 Sol, GPT-6 Luna, GPT-6 Astra
How limits work	Rolling 5-hour session window plus weekly limits on paid plans; one pool shared across Claude apps and Claude Code. No fixed message count published.	Local messages per 5-hour period (published as ranges per model for Plus/Business) plus weekly limits; Pro plans currently have no 5-hour limit. Extra usage via ChatGPT credits.
Source	support.claude.com checked 2026-10-19	learn.chatgpt.com checked 2026-10-19

Limits are as stated by each vendor; we don't estimate undisclosed numbers. Not sure? Try the plan calculator.