OpenAI · Series B
Creator of ChatGPT, GPT-4, and the leading frontier AI lab.
Amount
$10.3B
Round
Series B
Valuation
$157B
Announced
Oct 2, 2025
Investors
Lead investor
Participating investors
Notes
Largest private funding round in history
Other OpenAI rounds
| Date | Round | Amount | |
|---|---|---|---|
| Jan 23, 2024 | Series A | $10B | Details → |