Anthropic reportedly circulated and then retracted details of its planned IPO, including a proposed sale of 867 million shares at $70 to $80 each. The company said the pricing information was inaccurate and would be updated. Investors have discussed valuations of $1.1 trillion to $1.3 trillion. Anthropic, the AI startup behind Claude , sent out and then retracted details of its blockbuster IPO filing, Reuters reported citing emails to bankers.