I'm not saying they lie about it, but as a hypothetical there could be many reasons to lie. - realizing their model leaks confidential information against mali

I'm not saying they lie about it, but as a hypothetical there could be many reasons to lie. - realizing their model leaks confidential information against malicious prompts - copyright claims against them forcing them to remove bits of data from the training set - serious "alignment" bugs that need to be fixed - vastly improved optimization techniques that slightly affect results in 0.1% of the cases If updating the model would save the company a couple hundred million dollars, they might want to do it. And in some of the cases, I can imagine they have an incentive to keep the update low key.