According to monitoring by Beating, Musk announced on X that xAI plans to open source the current Grok 4.2 base model (with 0.5 trillion parameters) by the end of 2026. Although the model's parameter scale is relatively small, Musk emphasized that the open-source version will still hold significant practical value for the developer community. Previously, Musk publicly acknowledged that due to flaws in the quality, comprehensiveness, and ratio of training data, the underlying model running Grok 4.2 struggles with high-difficulty programming challenges. However, for routine natural language processing and basic reasoning tasks, the base model with 500 billion parameters still offers strong performance advantages. Open-sourcing large models is one of xAI's strategies. In March 2024, xAI open-sourced the Grok-1 model with 314 billion parameters, which was the largest open-source model at that time.