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- Elon Musk's OpenAI rival, xAI, says it just raised $6 billion in funding from investors.
- The AI startup is backed by VCs like Sequoia Capital and Saudi Arabia's Kingdom Holding.
- Musk said xAI's pre-money valuation was $18 billion.
Elon Musk's xAI just took a critical step in building up its war chest to take on Sam Altman's OpenAI.
The AI startup said in a blog post on Sunday that it had raised $6 billion for their Series B funding round.