xAI

Updated June 2026

xAI is Elon Musk's AI lab and the maker of Grok. Founded in 2023 after Musk's split from OpenAI, it built the Colossus supercomputer, merged into SpaceX in February 2026 in the largest corporate combination ever (~$1.25 trillion), and competes at the frontier with the Grok models — while drawing intense regulatory scrutiny over Grok's image generation.

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xAI is the AI lab behind Grok, founded in 2023 by Elon Musk after his break with OpenAI. In just over two years it built one of the world’s largest AI training supercomputers (Colossus, in Memphis), shipped four generations of Grok, and in February 2026 was absorbed into SpaceX in the largest corporate combination in history — a deal that valued xAI at about $250 billion and the merged SpaceX-plus-xAI entity at roughly $1.25 trillion (CNBC). Musk’s stated rationale was to fuse AI with SpaceX’s launch capability and build “orbital data centres.”

The 2026 story is one of extremes. xAI competes credibly at the frontier — Grok leads several reasoning and coding benchmarks — and moves faster on infrastructure than any rival. But it is also the most controversial frontier lab: Grok’s image generation triggered a global child-safety and non-consensual-deepfake scandal in early 2026, drawing regulator action on multiple continents, and xAI continues to publish less safety documentation than its peers. No other frontier lab carries both this much capability and this much regulatory exposure.

Quick facts

History and founding

xAI was incorporated in March 2023 and announced publicly that July, with the mission of building “maximally truth-seeking” AI. Musk co-founded OpenAI in 2015, left its board in 2018, and has been in open conflict with it since — suing OpenAI and later Apple over alleged anticompetitive conduct, while OpenAI counterclaims that Musk has run a harassment campaign. xAI’s founding team was drawn from DeepMind, Google and OpenAI, though most co-founders have since left, including Igor Babuschkin (departed August 2025 to start an AI-safety fund) and Christian Szegedy (February 2025). Musk remains the controlling figure.

A defining early move was the March 2025 merger with X (formerly Twitter), which gave Grok real-time access to the platform’s data and hundreds of millions of users. That positioned xAI as the only frontier lab embedded in a major social network — and set up the much larger combination a year later.

The SpaceX merger

In February 2026, SpaceX acquired xAI in an all-stock deal — the largest corporate combination ever recorded. SpaceX was valued at about $1 trillion and xAI at about $250 billion, for a combined entity of roughly $1.25 trillion (CNBC). Musk framed the logic as building “orbital data centres” — using SpaceX launch to put AI compute in space. SpaceX then went public in June 2026, with a Nasdaq debut that valued it at more than $2 trillion.

The merger makes xAI a subsidiary of SpaceX rather than a standalone company, consolidating Musk’s AI, launch and (via the earlier X deal) social-media assets under one roof. It also gives xAI access to SpaceX’s balance sheet and energy/infrastructure capability — relevant given xAI’s roughly $1-billion-a-month cash burn before the deal.

Days after the IPO, on 16 June 2026, SpaceX agreed to acquire Cursor maker Anysphere for $60 billion in an all-stock deal expected to close in the third quarter (Axios, CNBC). Cursor is one of the most-used AI coding tools, with annualised revenue around $4 billion by mid-2026, and the deal gives xAI a leading coding product and distribution channel for its Grok coding models — a direct push into the AI-coding race against Anthropic and OpenAI.

Funding and valuation

Before the SpaceX acquisition, xAI ran one of the most aggressive fundraising campaigns in tech history, raising over $42 billion across equity and debt in under three years.

Backers across these rounds included Andreessen Horowitz, Sequoia, BlackRock, Nvidia, Fidelity, the Qatar Investment Authority and Kingdom Holdings. Since February 2026, SpaceX is the parent.

Models and the Grok timeline

xAI’s product is Grok, iterated faster than any rival’s flagship. The standalone Grok app, the X integration and the xAI API all run on it; live benchmarks for each model appear in the table below this page.

Grok 4.3 is the current flagship, released in April 2026 with native video input, document generation (PDFs, spreadsheets, slides), improved tool-calling and a 1M-token context window, priced at about $1.25 / $2.50 per million tokens via the xAI API. xAI also offers cheaper, longer-context variants (Grok 4.20 and Grok 4.1 Fast, both 2M context) and the low-cost Grok Code Fast coding model. Grok 5 is in training on the Colossus 2 supercomputer with a reported ~10-trillion-parameter target and a projected arrival in the second or third quarter of 2026; Musk has called it “a shot at true AGI.” See best AI for coding for how Grok ranks against rivals; vendor benchmark numbers are a ceiling and standardised leaderboards a floor.

Colossus and compute

xAI’s signature capability is infrastructure speed. Its Colossus supercomputer in Memphis was stood up in roughly four months and scaled to hundreds of thousands of Nvidia GPUs — a build Nvidia’s Jensen Huang called “superhuman.” A second site, Colossus 2, targets gigawatt-scale and is where Grok 5 is being trained.

In a striking twist, in May 2026 SpaceX leased the entire Colossus 1 data centre — about 222,000 Nvidia GPUs and 300-plus megawatts — to rival Anthropic (Tom’s Hardware, Bloomberg). SpaceX did so after its own Grok teams hit latency problems linking Memphis to other sites. Musk described it as roughly a 180-day lease with a mutual cancellation notice; reporting on the contract documents points to about $1.25 billion per month. The Memphis buildout has also drawn environmental scrutiny over gas turbines and air permits in South Memphis.

Leadership

• Elon Musk — CEO and founder; also CEO of Tesla and SpaceX (xAI’s parent).
• Anthony Armstrong — Chief Financial Officer; former Morgan Stanley banker, joined October 2025.
• Day-to-day technical leadership is distributed across remaining researchers after heavy co-founder turnover (Igor Babuschkin and Christian Szegedy both departed in 2025).

Business and market position

Grok has grown quickly: xAI reported roughly 117 million monthly active users in SpaceX’s 2026 IPO filing, up from about 35 million in December 2025, making Grok one of the most-used AI assistants in the US behind ChatGPT and Gemini. Distribution comes from three channels — the X platform, the standalone Grok app (SuperGrok and SuperGrok Heavy tiers), and the API — plus integration into Tesla vehicles.

Commercially, xAI remains pre-profit and capital-intensive, with revenue far below its valuation and historically heavy cash burn; the SpaceX merger is partly a way to fund that scale. xAI’s differentiation is real-time X data, looser content moderation than rivals, aggressive pricing on its Fast and Code models, and the Musk ecosystem (X, Tesla, SpaceX). It has also won US government work, including a Department of Defense “frontier AI” contract.

Controversies

• Grok deepfake and child-safety scandal. The most serious episode of 2026: the Center for Countering Digital Hate estimated Grok generated roughly three million sexualised images over an 11-day window around the new year, of which about 23,000 appeared to depict children (RAND). Indonesia and Malaysia blocked Grok; California Attorney General Rob Bonta opened an investigation and issued a cease-and-desist in January 2026; New York Attorney General Letitia James demanded further action; Apple threatened to remove Grok from the App Store; and women and girls have sued xAI over sexualised deepfakes.
• Safety transparency. xAI publishes less pre-deployment safety documentation than OpenAI, Anthropic or Google, and has drawn unusual cross-lab criticism for it; the Future of Life Institute’s AI Safety Index has scored it poorly on accountability and transparency.
• Political positioning and outputs. Musk positions Grok as an “anti-woke” alternative, and the model has produced high-profile harmful or biased outputs, including an antisemitic-content incident in 2025; analyses have found its outputs tuned to reflect Musk’s views.
• Concentration of control. With xAI inside SpaceX, and X also Musk-owned, one individual now controls a frontier model, a major social platform and a dominant launch company — a concentration critics flag as a governance risk.

Recent developments (2026)

• SpaceX acquired xAI (February 2026) in the largest merger ever, valuing the combined entity at ~$1.25 trillion.
• SpaceX IPO (June 2026): a Nasdaq debut valued SpaceX, now xAI’s parent, at over $2 trillion.
• SpaceX agreed to buy Cursor (Anysphere) for $60 billion (16 June 2026), giving xAI a leading AI-coding product.
• $20 billion Series E (January 2026) at ~$230 billion preceded the acquisition.
• Grok 4.3 (April 2026) became the flagship; Grok 5 entered training on Colossus 2.
• SpaceX leased Colossus 1 to Anthropic (May 2026) — about 222,000 GPUs and 300+ MW — after its own teams hit latency issues.
• Regulatory backlash over Grok’s image generation widened across multiple jurisdictions through the first half of 2026.

Where xAI excels

• Reasoning and maths. Grok’s top tiers post frontier-level scores on hard reasoning and competition-maths benchmarks.
• Real-time data. Native access to X gives Grok current events, trends and public sentiment that web-search-based rivals lack.
• Infrastructure speed. Colossus showed xAI can build and scale frontier compute faster than anyone; SpaceX backing extends that edge.
• Price-performance. Grok Code Fast and the Fast variants undercut most rivals on cost for high-volume use.

Where xAI falls short

• Safety and trust. Thin safety documentation and the deepfake scandal create real regulatory and enterprise-adoption risk that peers do not carry to the same degree.
• Coding versus the leaders. Grok is competitive but generally trails Claude and the top OpenAI models on the hardest real-world software-engineering benchmarks.
• Consumer reach. Despite fast growth, Grok’s ~117 million users trail ChatGPT and Gemini, and X distribution hasn’t closed the gap.
• Polarisation. The “anti-woke” positioning and unpredictable outputs limit appeal to risk-averse enterprises.

Developer resources

The xAI API is OpenAI-compatible, so existing OpenAI integrations can switch with minimal changes. It exposes the Grok model family (Grok 4.3, the Fast variants and Grok Code Fast), live search over X, and image generation, with API-key management via the xAI console and pricing on the pricing page. Grok is also available through third-party routers such as OpenRouter and is integrated into the X platform and Tesla vehicles.

Frequently asked questions

Is xAI owned by Elon Musk?

Yes. Elon Musk founded xAI and remains its CEO and controlling figure. Since February 2026 xAI is a subsidiary of SpaceX, which Musk also runs, after SpaceX acquired xAI in an all-stock deal.

Did SpaceX buy xAI?

Yes. In February 2026 SpaceX acquired xAI in the largest corporate combination ever recorded, valuing xAI at about $250 billion and the combined SpaceX-plus-xAI entity at roughly $1.25 trillion. Musk framed the rationale as building “orbital data centres” ahead of a potential SpaceX IPO.

What is xAI’s latest model?

The current flagship is Grok 4.3, released in April 2026 with native video input, document generation and a 1M-token context window. Grok 5, with a reported ~10-trillion-parameter target, is in training on the Colossus 2 supercomputer and projected for the second or third quarter of 2026.

What is the Grok deepfake controversy?

In early 2026, Grok’s image generation was found to be producing large volumes of sexualised images, including material that appeared to depict children, prompting country-level blocks, investigations by the California and New York attorneys general, an App Store removal threat from Apple, and lawsuits. It is the most serious safety controversy facing a frontier AI lab in 2026.

Is Grok better than ChatGPT or Claude?

It depends on the task. Grok is competitive or leading on maths and reasoning and has unique real-time access to X, but it generally trails Claude and the top OpenAI models on the hardest coding benchmarks, has far fewer users, and carries greater safety and regulatory risk.

Why did SpaceX rent its Colossus supercomputer to Anthropic?

In May 2026 SpaceX leased the entire Colossus 1 data centre — about 222,000 Nvidia GPUs and 300-plus megawatts — to rival Anthropic, after xAI’s own Grok teams hit latency problems connecting the Memphis site to other facilities. Musk described it as roughly a 180-day lease; reporting points to about $1.25 billion per month.

Did SpaceX buy Cursor?

Yes. On 16 June 2026 SpaceX agreed to acquire Anysphere, the maker of the AI coding tool Cursor, for $60 billion in an all-stock deal expected to close in the third quarter of 2026. The acquisition strengthens xAI’s position in AI coding and gives a built-in distribution channel for its Grok coding models.

Models

Apps

• Grok