I wouldn't be surprised if they had already, internally. An OpenAI employee tweeted today that Codex has achieved "escape velocity" and is now improving rapidly. Make of that what you will.

Per WSJ, previously, they both had revenue sharing agreements. MSFT will no longer send any revenue to OpenAI. OpenAI will still send revenue to MSFT until 2030 (with new caps)

My understand was that was in relation to IP licensing. Microsoft got access to anything OpenAI built unless they declared they had developed AGI. This new article apparently unlinks revenue sharing from technology progress, but it's unclear to me if it changes the situation regarding IP if OpenAI (claim to) have achieved AGI.

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