Elon Musk announced that xAI's Grok 2.5 is now open source, with its weights available on Hugging Face. He revealed that Grok 3 will also be open sourced within six months. Musk emphasized Grok 3's comparable performance to Anthropic's Claude 4 Sonnet and GPT 4.1, while Grok 4 leads several benchmarks, sometimes outperforming OpenAI's GPT-5. This move underlines xAI's commitment to open-source advancements in artificial intelligence.