A couple of days ago there has been another thread about an experiment with many LLMs, where especially the Anthropic models were found to "cheat" in a large percentage of the coding tasks that had been benchmarked, by searching the Internet for appropriate code and inserting it in the program they had to write.

The conclusion of that study was that when benchmarking LLMs for coding ability, they should not have access to Internet, if you want to know their intrinsic abilities.

Moreover, this can be worrisome as a more direct copyright infringement than the one caused by training, because even if they find open source code on the Internet and they insert it in the generated files, it is pretty certain that it must have had a license that prohibits the removal of the copyright notice.

swe bench pro has a public and private test set, where the private eval is from proprietary codebases only