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On November 14, 2024, Elon Musk filed a first amended complaint in his existing federal lawsuit against OpenAI, adding Microsoft Corp. as a defendant. The filing also added Reid Hoffman and Microsoft executive Dee Templeton as defendants, while Musk’s company xAI and Shivon Zilis joined as plaintiffs.
Musk alleged that OpenAI abandoned its founding nonprofit mission and that Microsoft helped it become commercially and operationally dependent on the software company. Those assertions came from Musk’s pleading and were not findings that the court had made at the time. The case later proceeded through additional pleadings and trial; on May 18, 2026, a federal jury rejected Musk’s claims against OpenAI, its leaders and Microsoft, according to The Associated Press.
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What changed on November 14, 2024?
The filing was a first amended complaint, not a separate lawsuit or simply a public statement. It was submitted in Elon Musk et al. v. Samuel Altman et al., Case No. 4:24-cv-04722-YGR, in the U.S. District Court for the Northern District of California.
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The 107-page complaint expanded the parties and the theories of the existing case. Most notably, it named Microsoft as a defendant. It also added Hoffman, a former OpenAI board member, and Templeton, identified in coverage as a Microsoft vice president and former OpenAI board observer. California Attorney General Rob Bonta was included in a special procedural role connected to a claim involving OpenAI’s nonprofit corporation.
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The filing included exhibits containing historical communications involving Musk, Sam Altman and other OpenAI founders. Its allegations described Musk’s version of OpenAI’s founding purpose, later corporate changes and Microsoft’s relationship with the company. Read the first amended complaint for the pleading itself.
Why did Musk add Microsoft?
Musk’s legal theory treated Microsoft as more than an investor or cloud-infrastructure provider. The complaint alleged that Microsoft benefited from OpenAI’s move away from its nonprofit purpose and helped create what Musk’s lawyers called a “de facto merger.”
Among the specific allegations were that Microsoft:
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- received or exchanged competitively sensitive information with OpenAI;
- gave OpenAI preferential access to computing capacity; and
- participated in conduct that allegedly disadvantaged competitors, including xAI.
The complaint alleged that xAI could not obtain Microsoft computing capacity on terms comparable to OpenAI’s. It also alleged that the companies’ relationship harmed competition. These were allegations by Musk and the other plaintiffs, not established findings that Microsoft had violated the law.
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What was the broader lawsuit about?
Musk was a co-founder of OpenAI and had previously alleged that he donated more than $44 million to the organization. His filings argued that OpenAI was created as a nonprofit intended to develop artificial intelligence for humanity’s benefit, but later built or expanded for-profit structures that departed from those commitments.
The amended complaint asserted theories involving:
- breach of charitable or nonprofit obligations;
- unjust enrichment;
- alleged breaches of fiduciary duties;
- antitrust violations and interference with competition;
- federal civil RICO claims; and
- Microsoft’s alleged role in OpenAI’s corporate and commercial arrangements.
A complaint states what plaintiffs claim and the legal theories they ask the court to accept. It does not prove those claims. Some claims were later dismissed, while others proceeded at later stages of the litigation.
Who was added to the case?
| Role in the amended complaint | Party | Why the addition mattered |
|---|---|---|
| Plaintiff | Elon Musk | Original litigant and OpenAI co-founder. |
| Plaintiff | xAI Corp. | Added a direct competitor and a claimed competitive-injury narrative. |
| Plaintiff | Shivon Zilis | Joined as an individual plaintiff; she was a former OpenAI board member. |
| Defendant | Microsoft Corp. | OpenAI investor, infrastructure partner and alleged beneficiary of the relationship. |
| Defendant | Reid Hoffman | Former OpenAI board member with technology and investment ties. |
| Defendant | Dee Templeton | Microsoft executive and former OpenAI board observer, according to contemporaneous coverage. |
| Specially joined party | Rob Bonta | California attorney general, included for a specified nonprofit-law claim rather than as an ordinary defendant on every count. |
The complaint’s definitions and caption are important here: the parties were not all accused of the same conduct or included for every claim. Calling Bonta simply “another defendant” obscures his more limited procedural role.
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xAI’s participation made the competition allegations more concrete. Musk’s company alleged that OpenAI and Microsoft’s arrangements disadvantaged rival AI businesses through infrastructure access, investment relationships and the sharing of sensitive information.
The complaint also alleged that OpenAI sought commitments from investors not to fund competing companies and characterized OpenAI as holding about 70% of the generative-AI market. That percentage was a litigation allegation, not an independently verified market measurement.
xAI’s involvement also supplied context that readers should keep separate from the legal merits: Musk was both a plaintiff and a competitor of OpenAI. That fact may be relevant to how the dispute developed, but it does not by itself establish that the claims were true or false.
What was the Microsoft–OpenAI relationship?
Microsoft and OpenAI had a substantial commercial relationship before the amended complaint. Later court filings state that Microsoft agreed in July 2019 to invest $1 billion in OpenAI LP in exchange for a convertible limited-partnership interest and rights to certain profits. The partnership subsequently expanded through additional investment, cloud infrastructure and commercial integration.
That description is more precise than saying Microsoft simply “owned” OpenAI. The economic and governance arrangements involved particular partnership interests, profit rights, infrastructure commitments and evolving corporate structures. A shorthand such as “a 49% stake” can therefore be misleading unless the specific legal and economic meaning is explained.
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A January 15, 2026 court order also states that Microsoft invested an additional $750 million in OpenAI’s for-profit subsidiary in late 2024. The order says Microsoft and OpenAI entered a nonbinding memorandum of understanding in September 2025 concerning Microsoft’s potential equity stake in OpenAI’s successor public-benefit corporation. Those later developments provide context for the relationship, but they should not be treated as facts known when Musk filed the November 2024 pleading. See the January 15, 2026 court order.
How did OpenAI and Microsoft respond?
Contemporaneous coverage reported that OpenAI sought dismissal and characterized Musk’s lawsuit as baseless. Microsoft was a named defendant in the amended pleading, not a neutral observer, so statements from Microsoft should be understood as the response of a party with a direct interest in the case.
The later AP report says Microsoft welcomed the 2026 verdict and remained committed to its work with OpenAI. The existence of those responses does not resolve the allegations by itself; the procedural rulings and jury verdict are the relevant later developments.
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- November 14, 2024: Musk filed the first amended complaint, adding Microsoft, Hoffman and Templeton as defendants and xAI and Zilis as plaintiffs.
- May 22, 2025: Musk filed a second amended complaint, which became the later operative pleading identified in a January 2026 court order. Microsoft remained a defendant.
- 2025 motion-to-dismiss proceedings: A court ruling dismissed some counts against OpenAI and Microsoft without leave to amend. At that stage, another claim alleging that Microsoft aided and abetted a breach of fiduciary duty was allowed to continue. A ruling on a motion to dismiss is not a finding that the underlying allegations are true.
- May 18, 2026: A federal jury rejected Musk’s claims against OpenAI, Sam Altman, Greg Brockman and Microsoft, according to AP.
This sequence matters because the November 2024 headline describes a historical filing, not the final posture of the case. The first amended complaint was later replaced, some claims were dismissed, other issues proceeded, and the jury ultimately rejected Musk’s claims against the principal parties named in the verdict report. The available information here does not establish the status of any post-trial motions or appeal.
What does the case mean for readers?
The dispute was about more than a disagreement between technology executives. It raised questions about how a nonprofit-origin AI organization could use for-profit entities, outside capital, cloud infrastructure and commercial partnerships while preserving—or changing—its founding commitments.
It also illustrated why the wording of a lawsuit matters. “Microsoft was added as a defendant” is a verifiable procedural fact. “Microsoft illegally merged with OpenAI” would overstate an allegation as a proven conclusion. Likewise, the complaint’s market-share estimate and claims about preferential computing access should not be presented as independently established facts.
For business and personal-finance readers, the practical lesson is to distinguish among three different things: an allegation in a complaint, a court’s ruling on whether a claim may proceed, and a final trial result. They can point in different directions during the life of one case.
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