xAI

xAI is an artificial intelligence business established in 2023 under Elon Musk, who led it before the SpaceX acquisition.^[2] It develops the Grok family of large language models, consumer and enterprise AI products, application programming interfaces, and large-scale computing infrastructure. The business is operated within Space Exploration Technologies Corp. (SpaceX), principally through X.AI LLC. SpaceX's filings define "xAI" as X.AI Holdings LLC and its subsidiaries, while defining the broader "AI segment" to include AI compute, Grok, and the social-media platform X.^[2]

xAI began as a Nevada corporation, combined with X in March 2025, and was acquired by SpaceX in February 2026.^[2][3] SpaceX completed an initial public offering in June 2026, but xAI is not separately listed.^[4] By July 2026, the company website used the SpaceXAI brand and described its mission as accelerating scientific discovery by building AI to understand the universe.^[5]

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History and corporate structure

Founding and first product

X.AI Corp. was organized in Nevada in 2023. A December 2024 securities filing identified Musk as an executive officer and director and listed Palo Alto as the company's principal place of business.^[1] SpaceX's later prospectus states that X.AI Corp. began operations in March 2023.^[2]

xAI announced Grok in November 2023. The initial product was a conversational assistant built around Grok-1 and distributed through X. xAI described access to current information through X as a distinguishing feature, while its first model card cautioned that the underlying model could hallucinate and required human review for consequential work.^[6] The distinction between the model and the deployed service is important: search, tools, retrieval, and product policies can alter how a base model behaves without changing the model itself.

Financing

xAI publicly announced several large private financing rounds before its acquisition by SpaceX:

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These are announced round sizes, not a complete reconstruction of cash received, debt, secondary transactions, or the company's valuation. Adding the figures does not by itself establish total capital available at any later date.

Combination with X

On March 28, 2025, xAI acquired X Holdings Corp., the parent of X, in a common-control transaction. SpaceX's prospectus retrospectively presents the combined companies for periods before the transaction because both were controlled by Musk.^[2] The combination brought the Grok developer, the X distribution platform, and X's advertising and subscription operations under the same holding company.

The transaction also complicates company-level statistics. After the combination, figures for the group can include X even when reports describe them informally as "xAI" results. SpaceX's regulatory definition is explicit: its AI segment includes AI compute, Grok, and X.^[2] User counts, subscriptions, revenue, losses, and capital expenditure reported for that segment therefore should not be attributed to the standalone model business.

Acquisition by SpaceX

SpaceX and X.AI Holdings Corp. signed a merger agreement on January 31, 2026. The agreement provided for two sequential mergers, with the final surviving limited liability company wholly owned by SpaceX.^[3] The transaction became effective on February 2, 2026. SpaceX subsequently identified X.AI Holdings LLC as the xAI holding company and X.AI LLC and X Corp. as principal subsidiaries.^[2]

SpaceX completed its initial public offering on June 15, 2026. The offering covered 638,888,888 Class A shares, including the underwriters' full option, at $135 per share under the symbol SPCX.^[4] This made xAI part of a public parent company, not a separately traded issuer. Current corporate disclosures about the business are consequently found mainly in SpaceX filings.

In July 2026, x.ai adopted SpaceXAI branding. The site continued to use xAI in legal and product contexts, so "SpaceXAI" is best understood as the public brand while X.AI LLC remains a disclosed operating entity.^[2][5]

Products and research

Grok model family

Grok is xAI's principal model and product family. The release history includes base models, reasoning models, multimodal systems, and product-specific variants. Exact benchmark scores are omitted here because results depend on model version, prompt, tool access, evaluation harness, and whether the developer or an independent party ran the test.

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The March 2024 Grok-1 release is more precisely described as an open-weights release than as a fully reproducible open-source model. xAI published the weights and architecture, but not the complete training dataset or every artifact required to reproduce training.^[10] The academic Model Openness Framework treats model parameters, training data, preprocessing code, evaluation materials, and other lifecycle artifacts as separate dimensions of openness.^[19]

Grok-1 is a mixture of experts model. xAI reported 314 billion parameters with 25 percent of the weights active for a token, and said the checkpoint was trained with a stack built on JAX and Rust.^[10] Later Grok releases have generally been distributed as hosted services rather than downloadable weights.

Applications and API

xAI distributes Grok through grok.com, mobile applications, X, and developer APIs. Its offerings have included text and multimodal chat, search and citations, image and video generation, voice, coding tools, and enterprise products. Availability, limits, model names, and prices change frequently, so they are better checked in current product documentation than treated as durable company facts.

For a cross-provider product comparison, see ChatGPT vs Claude vs Gemini vs Grok.

For organizations, xAI has marketed Grok Business and Grok Enterprise, while the API exposes models and tools for software integration. SpaceX's prospectus says the AI segment earns revenue from X advertising and subscriptions, Grok subscriptions and licensing, API access, enterprise and government products, and sales of computing capacity.^[2] That list describes revenue sources; it does not show the contribution or profitability of each product.

In July 2025, xAI announced xAI for Government and said the US Department of Defense had awarded it a $200 million ceiling contract for developing and deploying AI capabilities.^[20] A contract ceiling is a maximum authorization, not evidence that the government paid or committed the full amount.

Training, evaluation, and documentation

xAI's December 2025 Frontier Artificial Intelligence Framework describes a risk-management process for models approaching defined capability thresholds. It covers chemical, biological, radiological, nuclear, and cyber risks, as well as malicious-use and loss-of-control scenarios, and states that the framework is intended to change as evidence and capabilities develop.^[21]

The Grok 4.20 system card documents pre-training on public, third-party, and internally generated data, followed by mid-training, supervised fine-tuning, and reinforcement learning. It reports internal and third-party safety testing across malicious use, prompt injection, deception, sycophancy, loss-of-control behaviors, and dual-use capabilities.^[17] These results are developer-reported evaluations, not independent certification.

Academic benchmarks can still be useful when their scope is clear. Humanity's Last Exam was designed as a 2,500-question multimodal benchmark of expert-level knowledge and reported low accuracy and calibration among frontier models available at publication.^[22] The ARC Prize 2025 technical report, which discusses public ARC-AGI results from xAI and other laboratories, warns that frontier-model performance can be constrained by knowledge coverage and affected by new forms of benchmark contamination.^[23] These findings support cautious comparison: a score measures performance under a particular protocol, not general intelligence or production safety.

Computing infrastructure

COLOSSUS

xAI built its first COLOSSUS computing cluster in Memphis, Tennessee, during 2024. In its December 2024 financing announcement, the company said the initial system used 100,000 Nvidia Hopper GPUs, became operational in 122 days, and was planned to expand to 200,000 GPUs.^[8] These construction-time and scale claims originated with xAI. They are useful for describing the company's stated buildout, but they are not an independent engineering audit.

SpaceX's June 2026 prospectus identifies the original COLOSSUS campus on Paul R. Lowry Road in Memphis. It defines COLOSSUS II as facilities on Tulane Road in Memphis and Stateline Road in Southaven, Mississippi.^[2] The filing describes COLOSSUS and COLOSSUS II together as approximately one gigawatt of computing capacity and says the clusters came online in 122 and 91 days, respectively.^[2]

xAI's January 2026 Series E announcement said its infrastructure ended 2025 with more than one million "H100 GPU equivalents."^[9] This is a normalized compute measure, not a count of one million physical H100 processors. Treating it as a hardware inventory can substantially overstate or misdescribe the deployed equipment.

The greater Memphis cluster supports both training and inference. SpaceX's prospectus also describes sales of compute capacity to third parties, so not all installed capacity should be assumed to serve Grok training at all times.^[2]

Energy, water, and local impact

Large AI data centers require electricity, cooling, land, network connectivity, and backup or on-site generation. SpaceX's prospectus says its data-center operations rely significantly on natural gas and turbine technology and require air-quality, stormwater, wastewater, land-use, building, and safety approvals.^[2]

The facilities have generated disputes about air permitting. In April 2026, the NAACP and its Mississippi state conference sued X.AI Corp. and MZX Tech LLC, alleging that mobile gas turbines at the Southaven COLOSSUS II site were stationary sources operating without required Clean Air Act permits. SpaceX disputed the allegation and said the turbines operated with permission from the Mississippi Department of Environmental Quality.^[2] In June 2026, the US Department of Justice moved to intervene and dismiss the citizen suit; the department described Mississippi's position that no permit was required, while the plaintiffs continued to seek an injunction and civil penalties.^[24] These were unresolved legal positions as of the research cutoff, not a final finding that either side was correct.

Business and financial reporting

SpaceX reports xAI-related operations inside its AI segment. The segment is broader than xAI because it includes AI compute, Grok, and X.^[2]

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The figures come from SpaceX's final prospectus and reflect the common-control presentation of the combined operations.^[2] They should not be labeled xAI-only revenue, loss, or spending. In particular, X advertising and subscriptions contribute to revenue, while the capital-expenditure figure includes the broader AI infrastructure program.

The same boundary applies to audience figures. SpaceX reported combined monthly active users and subscriptions across X and Grok, with overlap and methodological qualifications.^[2] Because those measures combine different services, this article does not convert them into a standalone xAI or Grok user count.

Governance, safety, and regulatory scrutiny

Data use and chatbot oversight

In April 2025, Ireland's Data Protection Commission opened an inquiry into X Internet Unlimited Company concerning the use of public posts by European users to train Grok models.^[25] The inquiry concerns X's compliance with the General Data Protection Regulation; its existence is not itself a finding that xAI or X violated the law.

In September 2025, the US Federal Trade Commission issued information orders to seven providers of consumer AI chatbots, including X.AI Corp. The study sought information about testing, monetization, data handling, disclosures, and safeguards for children and teenagers.^[26] The FTC stated that it used its Section 6(b) study authority, which does not have a specific law-enforcement purpose. The order therefore should not be described as an enforcement judgment against xAI.

Image generation investigations and lawsuits

In January and February 2026, regulators opened or expanded inquiries after reports that Grok features on X could be used to create sexualized images of real people, including children. The European Commission opened a Digital Services Act investigation against X concerning risk assessment and mitigation for Grok functions.^[27] The California attorney general sent xAI a cease-and-desist demand concerning alleged generation and distribution of nonconsensual intimate imagery and child sexual abuse material.^[28] Ireland's Data Protection Commission and the UK Information Commissioner's Office separately opened data-protection investigations focused on X entities and Grok-associated processing.^[29][30]

These actions differ in legal target and scope. Some address X as the platform operator, some name xAI, and none should be summarized as a final adjudication unless and until the relevant authority or court reaches one. SpaceX's prospectus also disclosed several pending civil cases against X.AI entities and other group companies involving Grok image generation and editing. It said the defendants intended to contest the claims.^[2]

Interpreting safety claims

xAI publishes model cards and a frontier-risk framework, but their publication does not resolve product-level safety questions. A deployed system combines a model with prompts, filters, tools, account controls, logging, and a distribution platform. Failures can arise from the model, the surrounding product, or their interaction.

Independent review should therefore distinguish:

• a developer's stated policy from measured compliance;
• a base-model evaluation from the behavior of a live application;
• a benchmark result from performance outside the tested protocol;
• an opened inquiry or filed complaint from a final legal finding; and
• a group-wide SpaceX AI-segment figure from an xAI-only figure.

Those distinctions are especially important for xAI because its corporate structure, infrastructure, Grok products, and X platform are integrated but are not interchangeable.

References

1. ^X.AI Corp., amended Form D. US Securities and Exchange Commission. December 5, 2024.
2. ^Space Exploration Technologies Corp., final prospectus. US Securities and Exchange Commission. June 12, 2026.
3. ^Agreement and Plan of Merger and Reorganization. Space Exploration Technologies Corp. and X.AI Holdings Corp. January 31, 2026.
4. ^Space Exploration Technologies Corp., Form 8-K. US Securities and Exchange Commission. June 15, 2026.
5. ^Company. SpaceXAI. Accessed July 28, 2026.
6. ^Grok-1 Model Card. xAI. November 3, 2023.
7. ^Series B funding round. xAI. May 26, 2024.
8. ^xAI raises $6B Series C. xAI. December 23, 2024.
9. ^xAI raises $20B Series E. xAI. January 6, 2026.
10. ^Open Release of Grok-1. xAI. March 17, 2024.
11. ^Announcing Grok-1.5. xAI. March 28, 2024.
12. ^Grok-1.5 Vision Preview. xAI. April 12, 2024.
13. ^Grok-2 Beta Release. xAI. August 13, 2024.
14. ^Grok 3 Beta. xAI. February 19, 2025.
15. ^Grok 4. xAI. July 9, 2025.
16. ^Grok 4.1. xAI. November 17, 2025.
17. ^Grok 4.20 System Card. xAI. April 7, 2026.
18. ^Introducing Grok 4.5. SpaceXAI. July 16, 2026.
19. ^The Model Openness Framework. White et al. March 20, 2024.
20. ^Announcing Grok for Government. xAI. July 14, 2025.
21. ^Frontier Artificial Intelligence Framework. xAI. Last updated December 30, 2025.
22. ^Humanity's Last Exam. Phan et al. Last revised July 28, 2026.
23. ^ARC Prize 2025: Technical Report. Chollet et al. January 15, 2026.
24. ^Justice Department files to intervene and dismiss Southaven lawsuit. US Department of Justice. June 16, 2026.
25. ^Data Protection Commission announces inquiry into X Internet Unlimited Company. Data Protection Commission. April 11, 2025.
26. ^FTC launches inquiry into AI chatbots acting as companions. US Federal Trade Commission. September 11, 2025.
27. ^Commission investigates Grok and X's recommender systems. European Commission. January 26, 2026.
28. ^Attorney General Bonta sends cease-and-desist letter to xAI. California Department of Justice. January 16, 2026.
29. ^Data Protection Commission opens investigation into X. Data Protection Commission. February 17, 2026.
30. ^ICO announces investigation into Grok. UK Information Commissioner's Office. February 3, 2026.