Is there a rift in the relationship between OpenAI and Microsoft? Dissatisfied OpenAI is preparing to file an antitrust lawsuit

Microsoft is the largest investor in OpenAI, having invested more than $13.75 billion in the past, and has built a deep relationship with it for about six years, but things are not going well, with business conflicts arising. In particular, OpenAI is dissatisfied with Microsoft's ability to hold intellectual property rights, and it seems that it is preparing to file a complaint with regulators that Microsoft is violating antitrust laws.
Exclusive | OpenAI and Microsoft Tensions Are Reaching a Boiling Point - WSJ

Tensions boil as OpenAI execs reportedly accused Microsoft of anticompetitive behavior as partnership frays | Windows Central
The cracks in the OpenAI-Microsoft relationship are reportedly widening | TechCrunch
https://techcrunch.com/2025/06/16/the-cracks-in-the-openai-microsoft-relationship-are-reportedly-widening/
There is a clash of opinions over OpenAI's IPO plans, with OpenAI wanting to reduce Microsoft's influence and Microsoft wanting to remain deeply involved in OpenAI.
OpenAI in talks with Microsoft for future IPO - GIGAZINE

According to a Wall Street Journal report citing people familiar with the matter, as negotiations with Microsoft have stalled in recent weeks, OpenAI executives have also discussed the option of 'accusing Microsoft of anticompetitive conduct during the partnership,' including 'seeking a regulatory review for possible antitrust violations.'
OpenAI and Microsoft signed a multi-year agreement in 2019, with Microsoft investing $1 billion (approximately 144 billion yen) for the development of general artificial intelligence (AGI). The partnership expanded further, with Microsoft acquiring an exclusive license to OpenAI's 'GPT-3' in 2020.
Microsoft acquires exclusive license for world-class language model 'GPT-3' - GIGAZINE
Although the two companies were seen as having a good relationship, OpenAI's acquisition of Windsurf, a startup developing AI coding tools, raised concerns that Windsurf was a product that directly competed with GitHub Copilot.
In addition, Microsoft has all of OpenAI's intellectual property rights in its hands, but OpenAI does not want to let Windsurf touch it. Even after the IPO, Microsoft is still involved in OpenAI, so it is said that it is seeking a larger stake than OpenAI has offered, making it unclear how long the partnership between the two companies will last.
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