There won't ever be newer training data.

The OG data came from sites like Stackoverflow. These sites will stop existing once LLMs become better and easier to use. Game over.

Every time claude code runs tests or builds after a change, it's collecting training data.

Has Anthropic been able to leverage this training data successfully?

I can't pretend to know how things work internally, but I would expect it to be involved in model updates.

You need human language programming-related questions to train on too, not just the code.

thats what the related chats are for?