...MEPs, led by Birgit Sippel from the S&D and Markéta Gregorová from the Greens, single out Facebook owner Meta for its not-so-open "open source AI."

"Meta prohibits the use of its Llama models for the purpose of training other AI systems, and forces anyone who develops a highly successful AI system based on Llama to negotiate a special licence with them," reads the letter.

Meta also doesn't share the code for how it trains its models, but very publicly champions its "open" approach.

"Their AI is only free and open until a business wants to compete with them," the MEPs write. "We urge the Commission and the AI office to clarify that such systems cannot be considered Open Source for the purposes of the AI Act."

More details about Meta's Llama 4 release: https://www.404media.co/facebook-pushes-its-llama-4-ai-model-to-the-right-wants-to-present-both-sides/