Tech giants Microsoft and OpenAI are reportedly renegotiating the terms of their high-profile partnership, amid tensions over corporate restructuring and future access to cutting-edge AI technology.

OpenAI is currently locked in a “tough negotiation” with Microsoft, its largest investor to date, having poured $13 billion into the AI startup, according to the Financial Times. The talks come as OpenAI pursues a significant corporate shift: converting its business arm into a for-profit public benefit corporation, while keeping control under its nonprofit board.

The success of this restructuring appears to hinge on Microsoft’s approval. Sources familiar with the matter told the FT that negotiations center on how much equity Microsoft will hold in the new for-profit entity. However, the discussions go beyond ownership stakes.

The two companies are also said to be revisiting the broader terms of their partnership, including a proposal from Microsoft to relinquish some of its equity in return for extended access to OpenAI’s post-2030 innovations.

Insiders suggest the renegotiation is complicated by growing competition between the two firms, particularly as OpenAI’s enterprise offerings expand and it pursues its ambitious Stargate infrastructure project — a move that could position it as a direct rival to Microsoft in certain areas.