evidence: The AI firm founded by Elon Musk has raised another $6 billion from investors, including Silicon Valley venture capitalists and a Saudi prince, boosting its valuation to $24 billion. [...] Musk, who founded xAI in July last year, wrote Monday on X that there would be "more to announce in the coming weeks," and that the startup had a valuation of $18 billion before receiving the new funding. [...] The funding sets the company up as a potential rival to OpenAI, the AI research group behind the wildly popular chatbot ChatGPT. Musk is a co-founder of OpenAI, but stepped down as chairman six years ago partly over disagreements about the company’s direction.