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I believe you can use your codex subscription with Pi, and it’s officially endorsed by OpenAI and uses your subscription usage.

Though for cc you are correct, using it with your sub draws from extra usage.

Anthropic is the only provider trying to lock in their users by using the dirty tactics:

- Prevent subscription usage on third party harnesses

- Append "Co-authored by Claude ..." to commit messages

I use GLM key on Pi and even Calude Code, never on ZCode. Even Codex sub can be used on 3rd party harnesses.

Anthropic and Google don't let you do it (there maybe be few more).

Deepseek harness can if using Deepseek V4.1 Flash from the official API, it's cheap enough to be competitive even without a subscription.

Pi supports OpenAI login for ChatGPT subscriptions.

Every 3rd party open-source harness I know of supports ChatGPT subscriptions.

Isn't this against TOS of OAI?

No. It’s against Anthropics TOS though.

It isn’t explicitly allowed in OAI’s TOS, however they publicly support Pi and OpenCode’s usage of their Oauth, and because Codex is open-source, it means the machinery to support Oauth login is open-source under Apache 2.0