Anthropic, a prominent AI startup, is negotiating a funding round that could boost its valuation to over $900 billion by May 2026, potentially making it the most valuable private AI company, surpassing OpenAI's valuation of $852 billion. Over the past 14 months, Anthropic's value skyrocketed from $61.5 billion in March 2025 to $183 billion by September 2025, and then to $380 billion by February 2026. The company reported an impressive annual revenue of around $30 billion, driven by strong demand from business clients, with over 1,000 companies paying more than $1 million annually for its services. A significant factor in this growth is the launch of its new AI model, Mythos, which has attracted interest from government officials and major tech leaders. To support Mythos, Anthropic has secured substantial investments from Amazon and Google, totaling $65 billion in commitments. The company is also preparing for a public listing, with expectations to raise around $60 billion in its IPO, which could occur as early as October 2026. This rapid growth raises questions about sustainability, especially as both Anthropic and OpenAI prepare for potential public offerings in 2026.