xAI burned $6.4B last year. SpaceX’s IPO filing shows why the spending is far from over

We finally have hard numbers on xAI's spending, and they're staggering. According to SpaceX's IPO filing, Elon Musk's AI company lost $6.4 billion in 2025. That's not a typo.

This is the first time we've seen actual financials for xAI, which has been operating mostly in the shadows compared to OpenAI and Anthropic. The filing also reveals plans for a massive expansion of Grok, xAI's chatbot that competes with ChatGPT and Claude.

The timing matters because it shows just how expensive the AI race has become. While OpenAI and Anthropic have raised billions, xAI's burn rate suggests Musk is betting even bigger on catching up. The question is whether that spending translates to a product people actually want to use.

For anyone building with AI tools, this is a reminder that the foundation models you rely on are incredibly expensive to develop and run. That cost structure shapes everything from pricing to feature availability.

The SpaceX connection is interesting too. By bundling xAI's financials into the SpaceX IPO filing, we're getting transparency that private AI companies rarely provide. It's a rare window into what it actually costs to compete at the frontier of AI development.

Whether xAI can turn that $6.4 billion into a product that justifies the spend remains to be seen. But now at least we know what Musk is willing to pay to find out.