OpenAI

OpenAI is an artificial intelligence research organization and Delaware Public Benefit Corporation, controlled by the OpenAI Nonprofit, founded on December 11, 2015. It released GPT-4o on May 13, 2024, the o3 reasoning model on December 20, 2024, and the o3-mini variant on January 31, 2025. As of February 12, 2025, the company disclosed ChatGPT had reached 400 million weekly active users, up from 300 million reported on December 4, 2024. Microsoft’s total investment stood at $13.75 billion as of January 2025, alongside funding from Thrive Capital, Tiger Global, and a16z. The board, reconstituted after Sam Altman’s removal on November 17, 2023, and reinstatement on November 21, 2023, includes Bret Taylor, Larry Summers, and Adam D’Angelo. On December 26, 2024, OpenAI announced plans to convert to a public benefit corporation, a restructuring contested in Musk v. Altman et al., filed in the U.S. District Court for the Northern District of California on February 29, 2024. OpenAI matters now because its rapid user scaling and unresolved corporate governance dispute are shaping regulatory and legal frameworks for frontier AI development.

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