The company has raised $134.7 million in equity financing from a total offering amount of $1 billion, the filing with the Securities and Exchange Commission showed.

Fundraising for AI remains a bright spot for startups this year, following OpenAI's launch of popular chatbot ChatGPT last year and raising of $10 billion from its strategic backer Microsoft Corp. Regulators, however, are concerned about the potential use of the technology to spread misinformation.

Musk has been vocal about his plans to build safer AI. In a Twitter Spaces event earlier in the year he said that rather than explicitly programming morality into its AI, xAI will seek to create a "maximally curious" AI.

The billionaire, who has criticized Big Tech's AI efforts as ridden with censorship, in July launched xAI, calling it a "maximum truth-seeking AI" to rival Google's Bard and Microsoft's Bing AI.

In 2015, Musk co-founded OpenAI, the company behind ChatGPT, which has created a frenzy for generative AI technology around the world, but stepped down from the board in 2018.

XAI last month launched "Grok" a chatbot rivaling OpenAI's ChatGPT.

The artificial intelligence startup will be integrated into his social media platform X and also be available as a standalone app, Musk said in a post in November.

The team behind xAI, which launched in July this year, comes from Google's DeepMind, the Windows parent, and other top AI research firms.