The social media platform X, under Elon Musk’s leadership, has officially open-sourced its platform algorithm, which is now available on GitHub. In its GitHub introduction, X explains that its “For You” feed combines content from within the network (accounts you follow) and outside the network (discovered via machine learning-based retrieval). All content is filtered and ranked using a transformer model based on Grok. X emphasizes that it has completely removed all manually engineered features and the vast majority of human-defined rules from the system. The entire system now relies almost entirely on the Grok-based model to perform core functions: it determines which content is “relevant” to you by understanding your interaction history (what you’ve liked, replied to, shared, etc.).