Unfortunately, we're all stuck moving at the speed of the model labs because of the subscription models that they've provided.
The rest of us were able to implement things like push a long time ago, but because Claude Code and Codex stubbed those things out, we couldn't really use them for 'most agent users'.
In fairness to OpenAI, they have been generous in allowing for example OpenCode to sign in with your ChatGPT subscription – so you _could_ build a more powerful agent (which OpenCode is... not) – but unfortunately GPTs' instruction following just isn't up to snuff yet. Hopefully they pre-train something amazing this year!