Microsoft CEO Satya Nadella is set to testify in the ongoing high-profile legal battle involving OpenAI, a case that has drawn global attention to the origins and transformation of one of the world’s leading artificial intelligence companies. The testimony is part of billionaire entrepreneur Elon Musk’s lawsuit against OpenAI and its leadership, including CEO Sam Altman.

The lawsuit centers around allegations that OpenAI abandoned its original nonprofit mission and evolved into a profit-driven AI giant closely tied to Microsoft. Musk, who co-founded OpenAI in 2015, claims the organization betrayed its founding principles by prioritizing commercial growth and corporate partnerships over the broader goal of developing safe artificial intelligence for humanity.

Nadella’s testimony is expected to focus on Microsoft’s partnership with OpenAI and internal communications related to the company’s transition into a for-profit structure. Court documents reportedly include emails discussing Microsoft’s investments and strategic support for OpenAI during its rapid rise following the launch of ChatGPT.

Microsoft has invested billions of dollars into OpenAI and has become its biggest strategic partner. However, Nadella has reportedly denied claims that Microsoft exercises direct control over OpenAI’s operations, arguing that the partnership was structured to accelerate AI innovation while maintaining OpenAI’s independence.

The trial has also exposed major internal tensions within OpenAI. Former executives and board members, including co-founder Ilya Sutskever and former CTO Mira Murati, have provided testimony describing disagreements over leadership, governance, and the company’s direction. Several witnesses accused Altman of being dishonest and creating internal instability during his tenure.

The proceedings are also revisiting the dramatic 2023 episode in which Altman was briefly removed as OpenAI CEO before being reinstated days later. Nadella reportedly played a crucial role during that crisis by supporting Altman and helping stabilize the company amid fears that top AI talent could leave for competitors such as Google or other emerging AI firms.

Musk is seeking massive financial damages and wants OpenAI to return to its original nonprofit structure. Analysts believe the outcome of the case could significantly impact the future governance of AI companies and redefine how major technology firms collaborate on artificial intelligence development.