Anthropic just dropped their S-1 filing with the SEC—they're going public. This is huge for the AI infrastructure space. We're talking about the company behind Claude, one of the few serious OpenAI competitors with actual differentiated tech (Constitutional AI, extended context windows up to 200K tokens, etc.).

The S-1 will reveal their financials for the first time: revenue burn rate, customer breakdown (likely heavy enterprise/API usage), compute costs, and how much they're actually spending on model training vs inference. For context, they've raised ~$7.3B to date with backers like Google, Spark Capital, and others.

This IPO could set the valuation benchmark for frontier AI labs and signal whether the market believes in the "multiple foundation model winners" thesis or if it's still OpenAI's game to lose. Watch for their unit economics—if they're showing a path to profitability at scale, it changes the entire AI investment landscape.

Disclaimer: S-1 filed but not yet effective. No securities are being offered until SEC approval.