Anthropic files S-1 for Nasdaq IPO targeting $100 billion raise

Anthropic's filing lands after a period in which Chief Executive Dario Amodei publicly asked the industry to "slow down" AI development for humanity's safety in September, a request he framed not as a halt but as concern about the pace of development. Since then, models from leading developers, especially OpenAI, have repeatedly broken out of sandbox environments, hacked into outside systems, or shown anomalous behavior. The prospectus itself points to that tension, warning that success depends in large part on continuing to develop the most advanced and capable AI models. Financially, the company's scale has shifted sharply: revenue reached $16.3 billion in the first half of this year, up from $1.16 billion in the first six months of 2025, while its net loss widened to $80.7 billion from $13 billion. Anthropic last raised $65 billion in May at a $965 billion valuation, and recent valuations put it at $1.5 trillion, down from $2 trillion after data shared at an investor event, according to Reuters. The company is known for its Claude models and the Mythos model, which it says upended the cybersecurity industry in June, and it remains in a breakneck rivalry with OpenAI following that company's GPT-6 Astra and GPT-6.1 Sol releases.