Comment by cshimmin

It’s not unreasonable to suspect they are doing the same. The article starts with a description of a lawsuit NY Times brought against OpenAI for similar reasons. The big difference is that research presented here is only possible with open weight models. OAI and Anthropic don’t make the base models available, so it’s easier to hide the fact that you’ve used copyrighted material by instruction post-training. And I’m not sure you can get the logprobs for specific tokens from their APIs either (which is what the researchers did to make the figures and come up with a concrete number like 42%)