OpenAI’s Seven‑Year Pivot: Splitting from Microsoft and Facing Elon Musk

Technical milestone that triggered the partnership shift

In August 2022 Bill Gates gave OpenAI an AP Biology exam question, predicting a language model would need at least three years to achieve a high score. OpenAI solved the exam perfectly in two months, a result Gates later called the most shocking technical demo he had ever seen.

Seven years of binding to unbinding (2019‑2025)

July 2019 Microsoft announced a $10 billion investment in OpenAI, making Azure the primary compute platform for OpenAI’s models. In January 2023 Microsoft pledged an additional $100 billion, securing exclusive rights to OpenAI’s intellectual property until 2030 and a 20 % revenue share.

After ChatGPT’s breakout success, OpenAI moved from a behind‑the‑scenes model supplier to a product‑focused company, selling APIs, launching an enterprise version, creating a GPTs Store, and building collaborative documents and browsers that directly compete with Microsoft’s own offerings.

Internal tensions emerged: a 2018 internal email from Microsoft CTO Kevin Scott described OpenAI as “just another bucket of undifferentiated GPUs.” By 2025 OpenAI publicly argued that Microsoft’s top‑tier chips and cloud resources could no longer meet its training demands, while Microsoft claimed it had provided “everything it could.”

Microsoft responded by diversifying its AI portfolio: developing lightweight Phi models, acquiring Inflection AI’s large‑model team (led by Mustafa Suleyman), rolling out its own enterprise model MAI for Copilot scenarios, and forming distribution deals with Hugging Face, Cohere and Mistral.

In early 2025 OpenAI announced the “Stargate” initiative with SoftBank, Oracle and other partners, explicitly omitting Microsoft and signalling a move toward multi‑cloud compute.

2025‑10 OpenAI and Microsoft signed a “next chapter” contract that relaxed the exclusive compute‑allocation clause, extended Microsoft’s IP license to 2032 (now non‑exclusive), and required OpenAI to purchase an additional $250 billion of Azure services.

February 2026 OpenAI signed a strategic partnership with Amazon Web Services (AWS). The AWS agreement grew from an initial $38 billion commitment to $1 trillion over eight years, and AWS became the exclusive third‑party cloud distributor for OpenAI’s Frontier platform.

Revised partnership (27 April 2026)

The joint blog announced a simplified collaboration. Three former “walls” were removed:

Exclusive cloud binding : Azure remains the primary launch platform, but OpenAI can now deliver services through any cloud provider. The seven‑year AWS agreement is formally recognized, and AWS will act as the exclusive third‑party distributor for the Frontier platform.

Exclusive IP license : Microsoft’s IP license is extended to 2032 and changes from exclusive to non‑exclusive, allowing other cloud partners to host OpenAI models.

Unlimited revenue sharing : The revenue‑share structure becomes one‑way; Microsoft no longer pays a share to OpenAI, while OpenAI continues to give Microsoft a 20 % share of its revenue until 2030, now capped at a fixed total amount.

The 2019 AGI clause—granting OpenAI’s nonprofit board the right to terminate Microsoft’s exclusive rights if AGI were achieved—was removed, and both parties agreed that Microsoft retains the right to pursue AGI independently.

Musk lawsuit (27 April 2026)

On the same day, Elon Musk filed a federal lawsuit in Oakland against OpenAI, alleging that co‑founders Sam Altman and Greg Brockman deceived him by promising a nonprofit, open‑source AI lab and later restructuring it into a for‑profit subsidiary.

The case, overseen by Judge Ivona Gonzalez Rogers (who previously handled Epic vs Apple), is expected to last four weeks. Musk’s claims focus on two causes of action—“violation of charitable trust” and “unjust enrichment”—after voluntarily dismissing fraud allegations.

Relief sought includes a permanent injunction to restore OpenAI’s nonprofit status, removal of Altman and Brockman from leadership, termination of the Microsoft binding, full disclosure of training data and technical details, and the return of early donations to charitable entities. Musk explicitly states he seeks no monetary compensation for himself.

Background: Musk co‑founded OpenAI in 2015, contributed roughly $38 million, and served as joint chair. In 2018 he opposed the shift toward capital‑driven commercialization; in February 2019 he proposed merging OpenAI into Tesla for data and funding, a proposal Altman rejected, leading Musk to resign from the board.

In 2019 OpenAI reorganized, creating a for‑profit subsidiary while the nonprofit foundation retained a 51 % stake and received a $1 billion investment from Microsoft. The restructuring raised Musk’s objections, which he now frames as “the nonprofit was stolen.”

Implications

OpenAI is preparing an IPO with a valuation exceeding $850 billion; the Musk lawsuit is listed as a material risk that could block the listing if the plaintiff prevails. Musk’s own AI venture, xAI, is projected to IPO in June 2026 with a valuation of $1.25 trillion, potentially gaining a decisive advantage if the suit succeeds.

The revised partnership and the courtroom battle together provide a rare glimpse into the previously secretive AI industry, exposing internal emails, diaries and strategic calculations that will now be examined in court.

References:

https://openai.com/index/next-phase-of-microsoft-partnership/

https://www.nasdaq.com/articles/openai-and-microsoft-just-revamped-their-longstanding-partnership-will-impact-microsofts

https://www.technologyreview.com/2026/04/27/1136466/elon-musk-and-sam-altman-are-going-to-court-over-openais-future/

https://news.cgtn.com/news/2026-04-28/Elon-Musk-OpenAI-set-to-face-off-in-court-1MHIzIWBnBS/p.html