Over the past few months, tech execs like Elon Musk have touted the performance of their company’s AI models on a particular benchmark: Chatbot Arena. Maintained by a nonprofit known as LMSYS ...

One AI company, Meta, was able to privately test 27 model variants on Chatbot Arena between January and March leading up to the tech giant’s Llama 4 release, the authors allege. At launch ...

The study revealed that major tech firms — including Meta, Google, and OpenAI — were given privileged access to test multiple versions of their AI models privately on Chatbot Arena.