OpenAI is currently in “a tough negotiation” with one of its biggest investors and partners, Microsoft, according to the Financial Times. The AI startup

Negotiations are underway betweenOpenAI and Microsoft to restructure their multi-billion dollar partnership. These talks are intended to allow OpenAI to eventually go public while ensuring that Microsoft retains access to its advanced artificial intelligence models.

Once the best of friends, OpenAI and its most important financial backer Microsoft Corp. are now involved in tough negotiations over the future of their partnership.