xAI AI Updates: May 29, 2026

1. xAI finishes training Grok V9-Medium, a 1.5 trillion parameter model trained on Cursor developer data and aimed at complex coding

xAI. xAI completed training on Grok V9-Medium, a 1.5 trillion parameter foundation model that triples the 500 billion parameter v8-small version currently serving production traffic. The model was trained specifically on Cursor developer data to capture how real engineers debug, refactor, and extend production codebases, with Musk framing it as a major step forward for complex programming tasks. Fine-tuning and reinforcement learning were still underway at announcement time, and a public launch is expected in mid-June 2026, roughly two to three weeks after the May 25 completion notice. The current v8-small model is slated for open-source release by the end of 2026. Source

2. xAI begins publishing daily Grok Build version updates on a dedicated public tracking page

xAI. xAI set up a dedicated page that publishes daily build version updates for Grok Build, its coding agent, and Musk promoted it directly to his 200 million plus followers. The move treats Grok’s development cadence more like an open software project with visible, timestamped progress, an unusual transparency play in a field where most labs share little between major version announcements. The daily page tracks the Grok Build coding agent specifically rather than the main chat model, letting developers monitor iterative improvements in real time. Source