Microsoft and OpenAI rewrite their marriage contract
Exclusivity ends, the AGI clause is gone, and the revenue share gets a ceiling — the most consequential hyperscaler-lab realignment so far..
Microsoft and OpenAI built the defining partnership of the modern AI era: Microsoft put in money and Azure compute, OpenAI built the models, and both sides agreed that Azure would be the only cloud allowed to sell those models. That arrangement is now over. Under a deal signed in late April and being detailed through May, OpenAI can sell its products on any cloud, including Amazon and Google. In return, Microsoft keeps a 27% stake in the new OpenAI Group PBC, holds a licence to OpenAI’s technology until 2032, and no longer has to argue about whether OpenAI has reached human-level AI. The cash flow between the two is simpler and capped. For enterprise buyers it means more vendors, more leverage, and more decisions.
On a Monday in late April, Satya Nadella and Sam Altman did something neither had managed for years: they stood on the same side of a press release and explained, in calm sentences, how they would untangle the most valuable corporate alliance in technology. The framing was deliberate. There was no breakup theatre, no leaked memos, no surprise board meeting in a Mexican hotel. Instead, OpenAI’s blog posted a note titled “The next phase of the Microsoft–OpenAI partnership,” and Microsoft’s investor relations team followed within minutes. The message: the old contract had outlived its usefulness, and the new one is built for a world where OpenAI is a public benefit corporation worth around $500 billion and Microsoft is the largest single buyer of its compute. The headline change is exclusivity. Since 2019, Azure had been the only cloud allowed to host OpenAI’s frontier models for outside customers. That clause is gone. OpenAI can now serve ChatGPT, the API, and future models from Amazon Web Services, Google Cloud, Oracle, or anyone else who can put GB300s on a floor. Microsoft, in exchange, gets a non-exclusive licence to OpenAI’s intellectual property — including model weights, research artefacts, and product code — that runs to a fixed date of 2032. Crucially, that licence no longer evaporates the moment OpenAI’s board declares it has built artificial general intelligence. The notorious “AGI clause,” which gave OpenAI the right to revoke Microsoft’s access if a panel of its own directors concluded the threshold had been crossed, has been retired. As Microsoft CTO Kevin Scott has put it for months, the company wanted “real agency at every layer of the stack” — and that is no longer compatible with a contractual self-destruct button. The second change is financial plumbing. OpenAI will continue to pay Microsoft a 20% share of its revenue, but only up to a total cap reported at $38 billion, and only through 2030. Microsoft’s reciprocal revenue share to OpenAI disappears. To grasp the scale: $38 billion is roughly Lufthansa’s annual group revenue, redirected from one private company to another over six years. Brad Smith, Microsoft’s vice chair, framed the package in interviews as “the right deal for the next phase,” noting that Microsoft’s original $13 billion investment has, by Azeem Azhar’s reckoning in Exponential View #574, already generated north of $30 billion in Azure revenue, with OpenAI itself ploughing back roughly $23 billion as Azure’s single largest AI customer — accounting for up to 60% of Azure’s AI revenue line at peak. The scene-setter for all this was Nadella’s testimony two weeks earlier in the Musk v. OpenAI trial in Oakland, where he described the November 2023 board crisis as “amateur city” and revealed Microsoft had quietly costed a $25 billion plan to absorb Altman and most of OpenAI’s staff if the company collapsed. “I don’t want to be IBM and OpenAI to be Microsoft,” Nadella told colleagues at the time. The new contract is the answer to that fear, written down.
The economics of the old deal had become awkward in three directions at once. OpenAI’s compute bill was vertical: leaked documents reviewed by Ed Zitron and others put OpenAI’s first-half 2025 Azure inference spend at $5.0 billion, rising to $8.7 billion cumulative by September. Microsoft’s Copilot costs, meanwhile, more than doubled from January 2026 as customers shifted onto reasoning models. And OpenAI’s investors — SoftBank, the sovereign funds in the Stargate vehicle, and a long queue of secondaries — wanted the company free to sign cloud deals wherever capacity was cheapest. The pre-existing structure, with its AGI trigger, its capped-profit waterfall, and its single-cloud lock-in, was actively destroying value for both sides. The new architecture replaces those frictions with a cleaner stack. OpenAI Group PBC, the public benefit corporation that emerged from the October 2025 recapitalisation, is governed by the OpenAI Foundation. Microsoft owns 27% of the PBC, a stake valued at roughly $135 billion when last marked. The IP licence is a fixed-term right, not a perpetual claim; the revenue share is a cap, not an open meter; the cloud relationship is preferred, not exclusive. In return, OpenAI has committed to spend a further reported $250 billion on Azure capacity over the term of the agreement — a soft floor that protects Microsoft’s data centre buildout even as AWS and Google enter the picture. The historical comparison that makes the scale tangible: Microsoft’s cumulative committed AI capex for 2026 alone is now larger than the entire annual GDP of Hungary. OpenAI’s 1.9 gigawatts of contracted compute, at roughly $53 billion per year, is more electricity than the city of Hamburg consumes. These are not software economics. They are utility economics, and they are being negotiated by companies that, five years ago, sold seat licences. More remarkable still is what the deal does not do. It does not give Microsoft preferential pricing on OpenAI’s next-generation models. It does not bind OpenAI to use Azure for training the successor to GPT-5.1. And it does not resolve the open question of who owns the research outputs once OpenAI’s own definition of AGI is, as the new contract states, “verified by an independent expert panel” rather than declared unilaterally by its board. That panel does not yet exist. Its composition will be one of the most quietly important governance fights of the next eighteen months. Ben Thompson, writing in Stratechery, called the restructure “the moment Microsoft stopped pretending OpenAI was a subsidiary and started treating it as a supplier.” That framing matters: suppliers can be replaced, dual-sourced, and squeezed. Subsidiaries cannot.
Not everyone reads the deal as a win. Ed Zitron, the most consistent skeptic of the AI economy, points out that the cap on OpenAI’s revenue share is only meaningful if OpenAI actually generates that revenue — and that the unit economics still imply an annual net loss in the low-twenty-billions for 2026. Gary Marcus, more architectural in his critique, argues that locking Microsoft into a 2032 IP licence assumes the underlying transformer paradigm will still be the frontier in six years, an assumption he calls “a bet on the absence of a better idea.” Even sympathetic analysts at the FT’s Lex column have noted that Microsoft’s accounting gain on the 27% stake — booked at fair value — is the kind of mark that can reverse violently if OpenAI’s next funding round prints below $500 billion. The deal cleans up the contract; it does not clean up the bet.
For DAX40 procurement teams, the practical change is leverage. Until last month, a Frankfurt bank or a Munich insurer wanting GPT-class models had one realistic enterprise route: Azure OpenAI Service, with Microsoft’s EU Data Boundary and the SAP Delos Cloud arrangement for sovereign workloads. From this summer, the same models will be procurable through AWS Bedrock and Google Vertex, each with its own DACH region footprint, pricing, and contractual posture. That changes the negotiating table. Expect CIOs at Allianz, Siemens, and Deutsche Bank to re-tender AI framework agreements within the next two quarters, using the multi-cloud option as a price discipline mechanism. The SAP–OpenAI ‘OpenAI for Germany’ partnership, hosted on Delos Cloud over Azure and slated for 2026 launch, was structured for the old exclusivity world; its commercial terms will need to be retested against an AWS-hosted equivalent.
Brussels gets two things it wanted. First, the end of single-cloud exclusivity removes one of the more obvious antitrust lines of attack: DG COMP had been quietly probing whether the Microsoft–OpenAI arrangement constituted a de facto merger under the EU Merger Regulation. The new structure, with OpenAI free to sell elsewhere and Microsoft holding a non-controlling 27%, makes that case much harder to bring. Second, the EU AI Act’s general-purpose AI obligations, which fall on the model provider, now have a clearer addressee: OpenAI itself, regardless of which cloud is reselling. That simplifies vendor-disclosure paperwork for downstream deployers but also concentrates GPAI Code of Practice scrutiny on OpenAI’s own systemic-risk filings. BaFin and BSI will read the new licence terms carefully for operational-resilience implications under DORA.
The signal to founders is twofold. One, the hyperscaler-lab exclusivity model is dead as a defensibility argument; Anthropic-on-AWS and OpenAI-on-Azure are no longer one-way bets, which means the wrapper startups built on top of either will face less platform risk and more pricing volatility. Two, the cap on Microsoft’s revenue share, combined with the fixed-term IP licence, validates a structure that European AI labs — Mistral, Aleph Alpha, Black Forest Labs — can credibly offer to their own strategic investors: bounded upside for the cloud partner, preserved optionality for the lab. Expect at least one DACH-based foundation model company to reference the new Microsoft–OpenAI architecture in its next funding round, using it as the template for a ‘partnership without capture’ pitch to corporate LPs.
Sources 5 references
- [1]The next phase of the Microsoft OpenAI partnership (OpenAI)
- [2]OpenAI shakes up partnership with Microsoft, capping revenue share payments (CNBC)
- [3]Exponential View #574 (Azeem Azhar)
- [4]Microsoft Claws Away ‘The Clause’ as OpenAI Claws Back Some Independence (Spyglass)
- [5]Microsoft loses IP exclusivity rights and sees revenue payments capped in updated OpenAI deal (DCD)