OpenAI closed a funding round at an $852 billion valuation according to CNBC reporting on March 31 2026. The company posted an announcement titled "accelerating the next phase AI" on its official site. (CNBC 2026 https://www.cnbc.com/2026/03/31/openai-funding-round-ipo.html OpenAI 2026 https://openai.com/index/accelerating-the-next-phase-ai).

OpenAI previously reached a $157 billion valuation in a 2024 tender offer reported by Reuters. Anthropic secured $18 billion in 2024 funding per New York Times coverage. The current round exceeds those figures by wide margins. (Reuters 2024 New York Times 2024).

CNBC coverage states the valuation and links to the OpenAI announcement but does not cite the exact prior-round benchmarks or list lead investors. Primary sources confirm only the headline valuation and blog reference.