Not quite. The underlying technology is open-source, but the specifics of the models of late (to say nothing of the tuned parameters) are not. Just because the

Not quite. The underlying technology is open-source, but the specifics of the models of late (to say nothing of the tuned parameters) are not. Just because the core of the architecture - or even the tooling used to build it - is open source does not make the result open source. That would be akin to saying anything compiled with LLVM and using well-known algorithms is Open Source.