Maybe. That is still pretty different from the source code for software though. Suppose OpenAI released all the training data, training methodology, and training source code, but didn't release the weights for a frontier model. Would that allow you to build the same model? Not unless you have hundreds of millions of dollars to spend on it. And even then you won't get the exact same thing. That's not to say it isn't valuable. But I'm not sure "open source" is really the right term for that either.