The final wire went out quietly, after the second quarter had already closed. In a July 31 SEC filing, Amazon disclosed that it had completed its $50 billion investment in OpenAI — sending the last $21.3 billion tranche sometime after June 30. It is the largest single-company AI investment on record, and it closed under circumstances worth pausing over. The transaction, first announced February 27, 2026, as part of OpenAI's $110 billion funding round, was structured in three phases: $15 billion in Q1 2026, another $13.7 billion in Q2, and a final tranche that was supposed to be gated on milestones. Those milestones were widely described as OpenAI completing an IPO or achieving an AGI breakthrough. Neither happened. Amazon wired the money anyway. What changed? In short, Microsoft. In March 2026, Microsoft was reportedly weighing legal action over the Amazon-OpenAI cloud deal, arguing that the original agreement made Azure the exclusive cloud for OpenAI's models and required all API calls to route through Azure. Amazon's plan to host OpenAI's enterprise platform, Frontier, directly threatened that. Then, on April 27, the two companies rewrote the contract. Microsoft's IP license shifted from exclusive to non-exclusive through 2032. Microsoft stopped paying OpenAI a revenue share, while OpenAI continues paying Microsoft 20% of revenue through 2030 — with a cap. The AGI clause was dropped. New OpenAI products still launch on Azure first, but they can now be sold through any cloud. That revision dissolved the legal overhang, and the cash followed within months.
Investment Breakdown
| Metric | Detail |
|---|---|
| Total investment | $50 billion (final $21.3B wired after Q2) |
| Equity acquired | ~5% |
| OpenAI post-money valuation | $852 billion |
| AWS cloud commitment | $100 billion over eight years, expanding a prior $38B agreement |
| OpenAI's total committed AWS spend | ~$138 billion |
| Trainium capacity commitment | 2 gigawatts across Trainium3 and Trainium4 |
| AWS Q2 2026 revenue | $42.2 billion, up 37% year over year |
| Amazon 2026 capex guidance | $220 billion |