OpenAI and Microsoft Are at the Center of Multiple Legal Cases Here Is What Is Actually Happening

OpenAI entered 2026 as the world’s most talked-about AI company — and also one of its most sued. The company faces a pattern of broken commitments that has turned some of its closest allies into adversaries and cost it $11.5 billion in losses in 2025. Three separate legal fights are now converging at once: Elon Musk’s fraud trial kicking off April 27, Microsoft threatening to sue over a $50 billion Amazon cloud deal, and a consumer antitrust class action targeting the Microsoft-OpenAI partnership itself. Here is every fight explained in plain English.

Fight #1 — Elon Musk vs. OpenAI and Microsoft: The $134 Billion Fraud Trial

What Is This Case About?

This is the big one — and it goes to trial in two weeks.

Elon Musk sued OpenAI and Microsoft in 2024, claiming the AI company he helped start “assiduously manipulated” and “deceived” him into donating $38 million, based on promises that the entity would remain a nonprofit.

Musk co-founded OpenAI in 2015 alongside Sam Altman and others as a nonprofit AI research lab. The deal, as Musk tells it, was simple: he would provide early funding and credibility in exchange for a permanent commitment that OpenAI would serve humanity rather than shareholders. He left the company in 2018. Years later, OpenAI took billions from Microsoft, built ChatGPT into a global product, and in October 2025 formally converted from a nonprofit into a for-profit public benefit corporation.

Musk argues that conversion was a fraud — that the people he trusted betrayed the foundational promise he funded.

What Is Musk Asking For?

Musk says he deserves up to $134 billion in “wrongful gains” based on how much OpenAI’s value has grown since he co-founded it in 2015. He is not asking for the money himself — he wants any payout to go back to OpenAI’s nonprofit arm, along with court oversight of the company’s finances and a shake-up in leadership, including removing CEO Sam Altman.

Per his April 7 amendment, Musk also wants both CEO Sam Altman and President Greg Brockman ousted and wants the two executives to hand over “all equity and other personal financial benefits they obtained as a result of OpenAI’s for-profit operations” to the OpenAI charity.

What Is OpenAI Saying Right Now?

The pre-trial maneuvering has turned explosive. OpenAI filed a court response accusing Musk of orchestrating a “legal ambush,” claiming he was “sandbagging the defendants and injecting chaos into the proceedings, while trying to recast his public narrative about his lawsuit.”

OpenAI called Musk’s last-minute amended complaint “legally improper and factually unsupported.” OpenAI and Microsoft are fighting back, disputing Musk’s damage claims and characterizing the lawsuit as a “harassment campaign.”

Where Does Microsoft Fit In?

Microsoft is a named defendant in Musk’s fraud case. Musk claims he is owed a share of the $13.3 billion to $25.1 billion in gains Microsoft has allegedly made from its investment in OpenAI. The argument is that Microsoft benefited directly from the alleged fraud — that it poured money into OpenAI knowing the nonprofit structure would eventually be dismantled, making its investment far more valuable.

What Happens Next?

Jury selection is set to begin April 27, 2026, in a federal court in Oakland, California. Both OpenAI and Microsoft deny any wrongdoing, and the trial is still scheduled to proceed.

Related article: Trex Company Class Action Lawsuit, What Happened, Who Was Covered, and What to Do If Your Deck Still Has Problems

Fight #2 — Microsoft Threatens to Sue OpenAI and Amazon Over the $50 Billion AWS Deal

What Happened?

While the Musk trial was building toward its April start date, a second legal fight erupted between OpenAI and its biggest financial backer.

In late February 2026, OpenAI and Amazon signed several agreements — including one that makes Amazon Web Services the exclusive third-party cloud provider for Frontier, OpenAI’s enterprise platform for building and running AI agents. Amazon invested $50 billion in OpenAI: $15 billion upfront and $35 billion in the coming months.

The problem? The dispute centers on whether OpenAI can offer Frontier via AWS without violating the Microsoft partnership, which requires the startup’s models to be accessed through Microsoft’s Azure cloud platform.

Why Does This Matter So Much to Microsoft?

After investing over $13 billion and securing 27% equity in OpenAI’s for-profit entity, Microsoft discovered its AI partner signed Amazon Web Services as the exclusive third-party provider for OpenAI’s new Frontier commercial product. The February 2026 launch targets enterprise AI agents — exactly the market Microsoft hoped to dominate through Azure.

Azure’s record revenues in recent years were driven in significant part by its OpenAI exclusivity. Losing that to Amazon is not just a contractual dispute — it strikes at the core of Microsoft’s AI business strategy.

What Is Microsoft Saying?

The language from Microsoft’s camp is unusually direct. “We know our contract,” a person familiar with Microsoft’s position told the Financial Times. “We will sue them if they breach it. If Amazon and OpenAI want to take a bet on the creativity of their contractual lawyers, I would back us, not them.”

What Is OpenAI’s Defense?

OpenAI and Amazon say they have engineered a technical workaround. Amazon and OpenAI are developing a “Stateful Runtime Environment” within AWS that enables AI systems to retain memory and context — features critical for enterprise use cases. OpenAI maintains that this setup does not provide direct API access to its core models and therefore remains compliant with the Microsoft agreement.

In a joint statement, Microsoft and OpenAI said “Azure remains the exclusive cloud provider of stateless OpenAI APIs,” a Microsoft spokesperson said, referring to software interfaces used to access OpenAI’s models. “We are confident that OpenAI understands and respects the importance of living up to this legal obligation.”

Has Microsoft Actually Filed a Lawsuit Yet?

No. As of mid-March 2026, talks were ongoing between the parties with the hope of resolving the dispute without resorting to legal proceedings ahead of Frontier’s launch. Microsoft has made clear it will file suit if those talks fail. This dispute remains live and unresolved as of April 13, 2026.

Fight #3 — Consumers Suing Microsoft Over the OpenAI Partnership Itself

While Microsoft threatens to sue OpenAI, it is simultaneously being sued by consumers over that same partnership.

Last year, Microsoft was sued in Samuel Bryant et al. v. Microsoft Corp., a proposed antitrust class action filed in the U.S. District Court for the Northern District of California. The lawsuit, brought by 11 consumers, challenges Microsoft’s high-profile partnership with OpenAI and accuses the company of using its cloud and investment agreements to restrict competition in the fast-growing field of artificial intelligence.

The plaintiffs claim Microsoft required OpenAI to run its AI workloads exclusively on Microsoft’s Azure cloud platform, and that this gave Microsoft an anticompetitive ability to limit compute supply for OpenAI. The argument is essentially the mirror image of what Microsoft is now threatening to enforce — that the same exclusivity agreement Microsoft is preparing to weaponize against Amazon is itself an antitrust violation against the public.

This case is in early stages and has not yet reached trial.

Fight #4 — The New York Times Copyright Case Against OpenAI and Microsoft

Running parallel to all of the above is a major copyright lawsuit that directly involves both companies.

On December 27, 2023, The New York Times sued Microsoft and OpenAI in the U.S. District Court for the Southern District of New York for copyright infringement. The Times alleges that the companies used millions of its copyrighted articles to train their AI models without its consent.

The case is in advanced stages. Expert discovery has been running through early 2026, with summary judgment proceedings recently concluded. No trial date has been set yet, but this case is one of the most closely watched AI copyright disputes in the country and could set precedent for how AI companies are permitted to use published content in training data.

The Bigger Picture: Why Is All of This Happening at Once?

These fights are not random. They all trace back to the same underlying tension: OpenAI started as a nonprofit, grew into a company valued at $730 billion, and is now trying to operate like a commercial tech giant while legacy agreements from its earlier, smaller days constrain every move it makes.

OpenAI was founded as a nonprofit research lab in 2015 but has experienced exploding commercial growth since launching ChatGPT to the public in late 2022. ChatGPT now boasts 900 million weekly active users, and the company generated $13.1 billion in 2025 revenue.

Every deal OpenAI made on the way up — with Musk’s early funding, with Microsoft’s $13 billion investment, with its nonprofit status — came with strings attached. Now that OpenAI is worth hundreds of billions and courting Amazon, SoftBank, and others, those strings are pulling tight. The result is a company going to trial in two weeks while simultaneously in contract negotiations with its biggest investor and fighting antitrust claims from consumers.

Microsoft invested $13 billion in OpenAI and secured cloud exclusivity for its Azure platform under a binding contract. OpenAI contends it has outgrown that arrangement. Microsoft disagrees — in court, if necessary.

Key Legal Fights at a Glance

Case	Parties	What It Is About	Status
Musk v. OpenAI & Microsoft	Elon Musk vs. OpenAI, Sam Altman, Microsoft	Fraud — alleged betrayal of nonprofit founding mission	Trial begins April 27, 2026
Microsoft vs. OpenAI & Amazon	Microsoft vs. OpenAI, AWS	Breach of contract — Azure cloud exclusivity	Pre-litigation negotiations ongoing
Bryant v. Microsoft	11 consumers vs. Microsoft	Antitrust — Azure exclusivity harms AI competition	Early litigation stage
NYT v. OpenAI & Microsoft	New York Times vs. OpenAI, Microsoft	Copyright infringement — training data	Advanced discovery stage

Frequently Asked Questions

Why is Elon Musk suing OpenAI and Microsoft? 

Musk sued in 2024, claiming OpenAI “assiduously manipulated” and “deceived” him into donating $38 million based on promises the company would remain a nonprofit. He argues the conversion to a for-profit company — backed by Microsoft’s billions — was a fraud against his founding investment and OpenAI’s original public mission.

How much is Musk seeking in damages? 

Musk is seeking in the range of $79 billion to $134 billion in “wrongful gains.” He is not asking for the money personally — he wants it directed to OpenAI’s nonprofit arm along with the removal of Sam Altman and Greg Brockman from their leadership roles.

When does the Musk vs. OpenAI trial start?

 Jury selection is scheduled to begin April 27, 2026, in federal court in Oakland, California. Both OpenAI and Microsoft deny wrongdoing and plan to fight the case.

Why is Microsoft threatening to sue OpenAI?

 Microsoft is considering legal action because OpenAI signed a $50 billion deal making Amazon Web Services the exclusive third-party cloud provider for its Frontier platform — which Microsoft argues violates its own exclusive cloud agreement requiring OpenAI’s models to be accessed through Azure.

Has Microsoft actually filed its lawsuit against OpenAI yet?

 No. As of April 13, 2026, the parties are in talks to resolve the dispute without litigation. Microsoft has made clear it will file suit if those talks fail.

What is the New York Times lawsuit about? 

The Times alleges that Microsoft and OpenAI used millions of its copyrighted articles to train their AI models without consent. The case is moving through advanced discovery and could set important precedent for whether AI companies can legally use published news content as training data.

Does any of this affect consumers who use ChatGPT or Copilot? 

Not directly — yet. None of these lawsuits require consumers to take any action. However, the outcome of the Microsoft-OpenAI dispute over cloud exclusivity could affect which platforms OpenAI’s products run on, potentially changing pricing or availability of AI services over time.

Last Updated: April 13, 2026

Disclaimer: This article is for informational purposes only and does not constitute legal advice. Legal claims and outcomes depend on specific facts and applicable law. For advice regarding a particular situation, consult a qualified attorney.