Jeff Bezos' Project Prometheus leads $20B+ AI funding week with $10B round

The biggest AI funding week of April 2026 is dominated by Jeff Bezos' return to a CEO role with his stealth startup Project Prometheus. The company, which launched in November 2025 with $6.2B, is now in talks for a $10B round at a $38B valuation, with JPMorgan and BlackRock as new investors. Prometheus focuses on physical AI — systems that learn from real-world physics — applied to chip manufacturing, aerospace, and automotive. Its advisors include two co-authors of the 'Attention Is All You Need' paper. Bezos co-founded and co-leads the company with Vik Bajaj, formerly of Google X.

Amazon deepened its bet on Anthropic with a fresh $5B investment, bringing total committed capital to over $33B, and securing a $100B cloud spending pledge from Anthropic. Anthropic's annualized revenue hit $14B+ in April, with Claude Code ARR at $2.5B, and the company released Claude Opus 4.6. Meanwhile, Cursor (Anysphere) entered talks for a $2B round at a $50B+ valuation, having reached $2B ARR in record time — the fastest zero-to-$2B revenue arc in B2B history — with projections of $6B+ ARR by year-end. Other notable rounds include Glydways' $170M Series C for autonomous transit. This funding surge signals that investors are betting heavily on both frontier AI and applied physical AI across industries.