Anthropic officially announced today that it has confidentially submitted an IPO prospectus (S-1) to the U.S. Securities and Exchange Commission (SEC). The company stated, 'This gives us the option to go public after the SEC completes its review,' and noted that 'the final decision to go public will depend on market conditions and other factors.' (CNBC) The number of shares to be issued and the offering price have not yet been determined.