# What the October 2025 Microsoft and OpenAI deal changed

> The agreement changed ownership and compute terms; its announcement describes a historical contract.

Source: https://fullbytedeveloper.com/blog/microsoft-openai-october-agreement-context
Originally posted: 2025-11-01
Published here: 2026-11-06

Microsoft's 2025-10-28 announcement described its stake after OpenAI's recapitalization and changes to their commercial agreement. Microsoft said it held approximately 27 percent of OpenAI Group PBC on an as-converted diluted basis, including all owners. [1]

## Separate ownership from service commitments

The announcement also said OpenAI contracted to buy an additional $250 billion of Azure services. That was a service-purchase commitment, separate from Microsoft's ownership stake. Microsoft would no longer have first refusal to supply OpenAI's compute. [1]

The companies described an independent expert panel to verify a future AGI declaration and set out different periods and conditions for intellectual-property rights. These were terms announced in October 2025, not proof that AGI had been achieved. [1]

The corporate structure is explained separately in [OpenAI's recapitalization and IPO distinction](/blog/openai-recapitalization-ipo-distinction).

When evaluating a service today, check its current contract and product terms. A historical partnership announcement does not establish your application's present hosting, data-handling or licensing rights.

## Sources

1. [Microsoft October 2025 OpenAI agreement](https://blogs.microsoft.com/blog/2025/10/28/the-next-chapter-of-the-microsoft-openai-partnership/)

## Original posts

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