Usually, it is already stated in their documentation (auth section). If a statement is vague, treat it as a no. It is not worth the risk when they can ban you at any time. For example, ChatGPT allows it, but Claude and Gemini do not.

https://developers.openai.com/codex/auth

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MillionOClock 4 hours ago | parent [-]

Maybe I am missing something from the docs of your link, but I unfortunately don't think it actually states anything regarding allowing users to connect and use their Codex quota in third party apps.

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s-lambert 4 hours ago | parent | next [-]

https://x.com/thdxr/status/2013010664776683644

I can't find anything official from OpenAI, but they have worked with the OpenCode people to support using your ChatGPT subscription in OpenCode.

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adastra22 4 hours ago | parent | prev [-]

From TFA: “OAuth authentication (used with Free, Pro, and Max plans) is intended exclusively for Claude Code and Claude.ai. Using OAuth tokens obtained through Claude Free, Pro, or Max accounts in any other product, tool, or service — including the Agent SDK — is not permitted and constitutes a violation of the Consumer Terms of Service.”

	▲	MillionOClock 4 hours ago \| parent \| next [-]
		The comment you are responding to is about ChatGPT/Codex, not Claude.
	▲	raincole 4 hours ago \| parent \| prev [-]
		They're not asking if Claude forbids it. They're asking if OpenAI (Codex, specifically) allows it.