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Yes—but “not very open” needs a precise meaning. Microsoft and OpenAI have disclosed unusually detailed headline terms covering ownership, cloud services, intellectual-property rights, revenue sharing, compute commitments and an AGI-related provision. What they have not published is the complete, independently auditable contract and the information needed to reconstruct the relationship’s full economics and control structure.
That distinction matters to investors, businesses choosing an AI provider and households indirectly exposed through technology companies, cloud prices and workplace software. As of the public record available through August 18, 2026, Microsoft remains a major OpenAI shareholder and its primary cloud partner, but OpenAI has gained more freedom to use other clouds and Microsoft’s OpenAI IP license is now non-exclusive.
The short answer: selective transparency, not total secrecy
Microsoft is not silent about OpenAI. It publishes partnership announcements, regulatory filings and summaries of major amendments. The problem is that these are company-controlled descriptions rather than the underlying agreements, schedules, definitions and enforcement mechanisms.
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That makes the relationship difficult to audit. Different announcements describe different forms of exclusivity, different ownership measurements and different revenue arrangements. A statement can be technically accurate while still leaving readers unable to determine what Microsoft can actually control, what OpenAI can take elsewhere and how money moves between the companies.
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The fairest conclusion is therefore:
Microsoft is selectively transparent about OpenAI. It discloses major headline terms, but outsiders still cannot independently reconstruct the full economic, governance and technical relationship.
Why the deal keeps changing
The public record is not one stable partnership description. It is a sequence of negotiated summaries whose language and practical implications changed materially.
| Date | What was publicly described | Why it matters |
|---|---|---|
| 2019 | Microsoft and OpenAI began a strategic relationship that Microsoft described as developing from an investment in a research organization into a major commercial partnership. | The arrangement combines investment, cloud infrastructure, intellectual property and commercial distribution rather than representing a simple equity holding. |
| January 21, 2025 | Microsoft said the partnership would continue through 2030, with Microsoft access to OpenAI IP, Azure exclusivity for the OpenAI API, reciprocal revenue sharing, a large Azure commitment and a right of first refusal for some new capacity. | This was the earlier public baseline against which later changes are measured. Microsoft’s announcement used stronger exclusivity language than the later description. |
| October 28, 2025 | Microsoft disclosed an OpenAI recapitalization into a public benefit corporation. Its investment was described as approximately $135 billion, representing roughly 27% on an as-converted diluted basis. The announcement also described IP rights through 2032, independent review of an AGI declaration, a further $250 billion Azure-services commitment, the loss of Microsoft’s right of first refusal and permission for qualifying open-weight models. | The figure is a diluted, as-converted ownership description—not a simple statement that Microsoft controls 27% of every voting or economic right. The Azure commitment is a services purchase commitment, not the same thing as a cash investment. |
| February 27, 2026 | OpenAI said Microsoft retained an exclusive license and access to OpenAI model and product IP under the then-current agreement; Azure remained the exclusive cloud provider for stateless OpenAI APIs; revenue sharing was unchanged; and OpenAI could obtain additional compute elsewhere. | This statement shows why “exclusive” must be qualified. API access, cloud hosting, model licensing and compute supply are related but not identical rights. OpenAI’s statement described the arrangement at that point in time. |
| April 27, 2026 | Microsoft said it remained OpenAI’s primary cloud partner. OpenAI could serve products across other cloud providers when Microsoft could not or chose not to support the required capabilities. Microsoft’s IP license continued through 2032 but became non-exclusive. Microsoft would no longer pay a revenue share to OpenAI, while OpenAI’s payments to Microsoft would continue through 2030 subject to a total cap. | This is the latest major public amendment in the supplied record. It gives OpenAI more operational flexibility while preserving substantial Microsoft economic and infrastructure interests. Microsoft’s April announcement is the key source. |
What has actually been disclosed
Ownership
The October 2025 disclosure described Microsoft’s investment at approximately $135 billion and roughly 27% on an as-converted diluted basis, inclusive of employees, investors and the OpenAI Foundation. Microsoft had also previously described a 32.5% stake excluding the effect of recent funding rounds.
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Those numbers are not automatically contradictory. Ownership percentages depend on the measurement date, conversion assumptions, dilution and which interests are included. Neither figure should be casually translated into “Microsoft owns OpenAI” or “Microsoft controls OpenAI.” A substantial economic stake is not the same as majority voting control or unilateral authority over OpenAI’s mission, board or products.
Cloud services and compute
The relationship has included major Azure commitments and, at earlier points, strong Azure-exclusivity language. The October 2025 terms included an additional $250 billion purchase of Azure services. That number illustrates the scale of the commercial relationship, but it should not be treated as equivalent to Microsoft investing $250 billion in cash.
By April 2026, Microsoft described itself as OpenAI’s primary cloud partner rather than saying every OpenAI product had to be hosted exclusively on Azure. OpenAI could use another cloud provider where Microsoft could not or chose not to provide the necessary capability.
For customers, the difference is practical. An OpenAI service may be available through Microsoft’s Azure infrastructure, directly from OpenAI or through other arrangements, but availability, capacity, pricing and data controls can differ by product and region.
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Microsoft has important access and licensing rights, but a license is not ownership of OpenAI or every future model. The October 2025 description extended Microsoft’s rights through 2032, including post-AGI models with safety guardrails. In April 2026, Microsoft said that license became non-exclusive.
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“Non-exclusive” means OpenAI can license comparable rights elsewhere, subject to the actual contract. It does not mean Microsoft lost all access, and it does not reveal the precise models, products, territories, sublicensing rights or restrictions covered by the agreement.
Revenue sharing
The January 2025 and February 2026 descriptions referred to reciprocal revenue sharing. Microsoft’s April 2026 announcement said Microsoft would no longer pay a revenue share to OpenAI, while OpenAI’s payments to Microsoft would continue through 2030 at the same percentage but with a total cap.
The public summary does not disclose enough detail to calculate the relationship’s complete economics. Readers cannot independently determine from the announcement alone how the cap applies, which revenue categories count, when payments are recognized or how cloud-service economics interact with licensing and equity accounting.
The AGI provision
The October 2025 terms described independent expert-panel review of an AGI declaration. That matters because AGI was not merely a technical label in this relationship; it could affect contractual and financial rights.
AGI is also not a universally agreed, independently measurable event. The public summaries do not provide the full definition, the panel’s appointment process, its evidentiary standard, its authority in a dispute or the consequences of a disagreement. The existence of an independent review process is therefore more transparent than a private determination, but it is not the same as publishing an auditable mechanism.
Open-weight models
The October 2025 terms permitted OpenAI to release open-weight models meeting specified capability criteria. That does not make OpenAI broadly open-source. Open weights are only one component of a model system; code, training data, evaluation methods, safety processes, infrastructure and governance can remain closed.
What outsiders still cannot verify
The central transparency problem is specific missing information, not the absence of all information.
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The public record provides summaries rather than complete contracts, schedules, side letters and implementation documents. It does not fully define terms that carry major consequences, including:
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- “AGI,” “research IP,” “models,” “products” and “safety guardrails”;
- the scope of Microsoft’s access to current and future models;
- the precise meaning of “primary cloud partner”;
- the circumstances in which Microsoft can decline or cannot support OpenAI’s capacity needs;
- remedies for alleged breaches of cloud, licensing or exclusivity obligations;
- restrictions on Microsoft’s independent AGI work; and
- the conditions under which OpenAI can use other infrastructure or commercial partners.
These are unanswered questions in the public record, not proof that undisclosed provisions are improper.
The full economics
It is difficult for outsiders to reconcile all of the following:
- Microsoft’s cash investment;
- Azure services consumed by OpenAI;
- future Azure purchase commitments;
- revenue Microsoft receives from Azure OpenAI Service, Copilot and other products using OpenAI technology;
- payments OpenAI makes to Microsoft;
- the economic value of model access and IP rights; and
- any credits, preferential pricing or infrastructure arrangements.
Microsoft’s filings can show accounting treatment and reported investment results, but an accounting entry is not the same as an independent estimate of the partnership’s total profitability. The FTC’s study context cited a publicly reported Microsoft–OpenAI investment figure of $13.75 billion, but that predates the later restructuring and should not be presented as Microsoft’s current total position.
Microsoft’s later filings may contain additional accounting information. Any quarterly figure should be identified precisely as an equity-method gain or loss, revenue, investment amount or another category; those categories are not interchangeable. Relevant filings include Microsoft’s October 2025 exhibit, its fiscal 2025 annual filing and its later quarterly filing.
Governance and practical control
The important question is not simply, “Does Microsoft own OpenAI?” It is, “Which decisions can Microsoft influence, block or economically constrain?”
The public record identifies Microsoft as a major shareholder, a major infrastructure partner and a holder of significant IP rights. OpenAI’s public benefit corporation structure and Foundation governance also matter. But the summaries do not allow outsiders to map every board right, consultation right, veto, escalation process or remedy.
Formal ownership is only one form of influence. Dependence on compute, access to customers, model licensing, cloud capacity and sensitive technical information can affect bargaining power even without formal control.
What the FTC adds
The Federal Trade Commission’s Section 6(b) study is the strongest independent support for the transparency criticism. It examined Microsoft–OpenAI, Amazon–Anthropic and Alphabet–Anthropic partnerships and used both public reporting and nonpublic submissions through September 2024.
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The FTC said public reporting and company marketing left gaps in its understanding, making nonpublic information necessary for its analysis. It also aggregated or anonymized information to protect trade secrets and confidential financial or commercial information.
The report identified partnership features that can matter to competition, including:
- equity investments and revenue sharing;
- consultation or control rights;
- preferential or exclusive treatment;
- cloud-spending commitments;
- shared compute and engineering personnel;
- intellectual property and training data; and
- access to sensitive commercial or technical information.
The FTC noted that these structures may increase switching costs or affect competitors’ access to compute and engineering talent. That is important for customers and investors because the issue is not merely whether a press release is clear. The structure may influence which providers can compete, how portable an AI application is and how dependent a business becomes on one cloud or model supplier.
There is an important limit: the report was not a formal legal or economic analysis, was limited to the study period and was not an antitrust ruling. It supports concern about information asymmetry and potential competition effects; it does not establish that Microsoft violated antitrust law or controls OpenAI.
See the FTC report and its summary release.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why the wording matters
| Term | What it does not necessarily mean |
|---|---|
| Exclusive cloud provider for stateless APIs | It does not necessarily mean every OpenAI product, research workload or third-party arrangement must use Azure. |
| Primary cloud partner | It does not mean Microsoft controls OpenAI or that OpenAI cannot use another cloud. |
| 27% stake | It is not automatically 27% of every voting right, economic right or future model. |
| License to IP | It does not mean Microsoft owns OpenAI or all future OpenAI technology. |
| Revenue sharing | It does not reveal profitability, margins, caps, timing or the value of related cloud services. |
| Open-weight models | It does not mean OpenAI’s frontier models, code, data or governance are open-source. |
| Public benefit corporation | It does not automatically make private contracts, financial terms or governance mechanisms public. |
What this means for customers
Businesses do not need to reject Microsoft or OpenAI services simply because the partnership is complex. They do need to treat the relationship as a procurement and continuity issue.
Model availability and portability
A customer building directly on a particular model may face migration costs if that model is retired, repriced, capacity-constrained or no longer available through its preferred channel. Prompts, tool definitions, fine-tuning, evaluations and application logic may not transfer perfectly between providers.
Cloud dependence
Azure OpenAI Service can be attractive to organizations already using Microsoft identity, networking, security, compliance and billing. But Azure dependence can also make switching more expensive if the customer’s application, data pipelines and permissions are tightly integrated with Microsoft.
Product labels are not interchangeable
Azure OpenAI Service, the OpenAI API, ChatGPT Business or Enterprise, Microsoft 365 Copilot and GitHub Copilot are different products with different contracts, billing models, data flows and support arrangements. A buyer should not assume that an agreement to purchase one provides the same model access, retention terms or continuity protections as another.
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Questions to ask before signing
- Can the application route requests to another model or cloud without a full rewrite?
- Are specific models, regions, quotas and service levels contractually guaranteed?
- What data is retained, logged, used for training or accessible to support personnel?
- What happens if the model is discontinued or the partnership terms change?
- Can prompts, evaluations, fine-tuning assets and tool schemas be exported?
- Are privacy, residency, sector and compliance requirements covered in the specific product contract?
- Is billing based on users, tokens, requests, negotiated capacity or another measure?
- What is the customer’s realistic exit cost?
A practical approach for buyers
The safest response to an evolving vendor relationship is a portable architecture:
- Place model calls behind an abstraction layer.
- Store prompts, evaluations and tool schemas independently of the provider.
- Test at least one alternative model for important workflows.
- Negotiate data-use, model-retirement and continuity terms where possible.
- Separate application logic from provider-specific features unless the benefit justifies the switching cost.
- Review the actual product contract instead of relying on corporate partnership announcements.
This does not eliminate vendor risk, but it prevents a buyer from treating a changing corporate relationship as a permanent technical guarantee.
What it means for investors
Investors should resist binary narratives. “Microsoft owns OpenAI” overstates formal control; “OpenAI is independent of Microsoft” understates Microsoft’s economic, infrastructure and licensing position.
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- How much of Microsoft’s return comes from equity appreciation, cloud consumption, product revenue or licensing economics?
- How are OpenAI-related gains and losses reported?
- How much future Azure demand is contractual, and how much depends on OpenAI’s growth?
- How durable are Microsoft’s model-access and IP rights after the license becomes non-exclusive?
- Could OpenAI’s use of other clouds reduce Azure dependence or simply expand total demand for Microsoft services?
- What happens to bargaining power if either company can develop or distribute frontier AI without the other?
Public filings can answer some accounting questions. They do not provide a complete valuation model for the partnership, and the absence of contract detail limits outside analysis.
Bottom line
Microsoft’s relationship with OpenAI is not a case of total secrecy. The companies have disclosed ownership descriptions, cloud commitments, IP access, revenue-sharing changes, AGI review arrangements and major dates.
But the disclosures are selective, change over time and leave crucial terms unauditable. The April 2026 language is materially different from the stronger exclusivity descriptions published in January 2025 and reaffirmed in February 2026. Microsoft remains a major shareholder and primary cloud partner, while OpenAI has gained more flexibility to use other clouds and Microsoft’s license is now non-exclusive.
So the defensible answer to the title is yes: Microsoft is not very open about OpenAI—not because it discloses nothing, but because the public receives headline terms without the complete contractual, financial and governance detail needed to verify how power and money are actually divided.
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