[Musk Finalizes Year-End Open Sourcing of Grok 4.2] According to monitoring by Beating, Musk announced on X that xAI plans to open source the current Grok 4.2 base model (with 0.5T parameters) by the end of 2026. Although the model's parameter scale is relatively small, Musk emphasized that the open-source version still holds significant practical value for the developer community. Previously, Musk publicly admitted that due to deficiencies in training data quality, comprehensiveness, and formula ratios, 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 demonstrates strong performance advantages. Open-sourcing large models is one of xAI's strategies. In March 2024, xAI had open-sourced the Grok-1 model with 314 billion parameters, which at the time was the largest open-source model. [Original Link]