Our reference case puts Grok 4.8 at 58 days after 4.7. Reinforcement learning, the training that improves a model using generated responses, remains the slower stage.

Our model puts the gap between Grok 4.7 and 4.8 at 52–99 days across the middle 80% of simulated outcomes. At our assumed speedup, an in-house reinforcement-learning stack would bring the reference release date forward by 26 days by shortening the work needed to improve the model’s responses before launch.