Source: before the Hugging Face incident, OpenAI was negotiating a legally binding deal with Anthropic for the companies to stress-test each other's models (The Information)

OpenAI announced that it was negotiating a legally binding agreement with Anthropic to stress-test each other’s language models. The deal would allow both companies to evaluate performance, safety, and robustness before deploying new models. This collaboration follows the Hugging Face incident, prompting tighter cross-company testing protocols.