OpenAI closes the largest private financing round in history. Amazon invests up to 50 billion and becomes a strategic partner. Meanwhile, Microsoft emphasizes that its own partnership will not change.

The investment was separate from the $100 billion funding round that OpenAI is finalizing, according to a source.

OpenAI's latest funding round is even bigger than its prior financing, which was a record amount for private tech companies.

OpenAI closes the largest private financing round in history. Amazon invests up to 50 billion and becomes a strategic partner. Meanwhile, Microsoft emphasizes that its own…

Deal signals feverish pace of AI investment with multibillion-dollar backings from Nvidia, Amazon and more

Amazon, Nvidia and Softbank collectively invested $100 billion dollars in OpenAI, which is double what it raised in a 2025 funding round.