xAI: Grok AI by Elon Musk — Merged with SpaceX at $1.25T Valuation

xAI builds Grok 4.3, the real-time AI powering X, Tesla, and the US DoD. $45B raised across 9 rounds. Merged into SpaceX (Feb 2026) at $1.25T. SuperGrok Lite from $10/month.

xAI, founded by Elon Musk in March 2023 and headquartered in Palo Alto, California, raised $45 billion across nine rounds before SpaceX acquired it in February 2026 at a combined $1.25 trillion valuation. The company builds Grok (current flagship: Grok 4.3), a frontier LLM integrated into X and Tesla, plus Aurora image generation and Grok Voice. Team size is approximately 4,000 to 4,900 employees, with the Colossus supercomputer targeting 1 million Nvidia GPUs by 2026.

xAI was founded in March 2023 by Elon Musk and 11 co-founders, headquartered in Palo Alto, California. The company raised $45 billion total, including a $20B Series E at a $230B valuation in January 2026, before SpaceX acquired it in February 2026 at a combined $1.25 trillion value. xAI builds Grok, a frontier large language model integrated into X (Twitter) and Tesla vehicles, differentiating through real-time data access and aggressive API pricing.

Founded: 2023 · HQ: Palo Alto, CA, USA · Team: 4000-5000 · CEO: Elon Musk · Funding: $45B total raised across 9 rounds (Nvidia, Cisco, A16Z, Fidelity, QIA, MGX, HUMAIN, Morgan Stanley). SpaceX acquired xAI Feb 2026 in all-stock deal. · Valuation: $230B (Series E, Jan 2026); SpaceX combined $1.25T (Feb 2026)

About xAI

xAI was incorporated in March 2023 and publicly announced on July 12, 2023, by Elon Musk alongside 11 co-founders recruited from OpenAI, DeepMind, Google Brain, Tesla, and the University of Toronto. The founding team included Igor Babuschkin (formerly at OpenAI), Manuel Kroiss, Guodong Zhang, Zihang Dai, and Ross Nordeen, among others. Musk launched xAI as a direct counter to what he characterized as overly restrictive AI development at competitors, positioning Grok as "maximally truth-seeking" with fewer content filters. The company incorporated as a C-Corp, initially based in San Francisco before establishing its primary research hub in Palo Alto, California. xAI's flagship product is Grok, a large language model chatbot integrated natively into X (formerly Twitter) and accessible via API at console.x.ai. Grok 3, released February 17, 2025, was xAI's first dedicated reasoning model trained on approximately 10x the compute of Grok 2, achieving top scores on AIME 2025 and GPQA benchmarks. Grok 4 launched July 9, 2025, with native tool use and real-time web search; Grok 4 Heavy introduced multi-agent orchestration in the same release. The current production flagship as of May 2026 is Grok 4.3, priced at $1.25 per million input tokens and $2.50 per million output tokens. Beyond text, xAI ships Aurora (text-to-image using autoregressive MoE architecture, launched December 2024), Grok Imagine (text-to-6-second video, launched July 28, 2025), Grok Voice (real-time low-latency speech agent integrated into Tesla vehicles), and Grok Build (a terminal-based coding agent for SuperGrok Heavy subscribers). 2026 opened with a rapid release cadence. Grok 4.20 beta (February 2026) introduced a 2-million-token context window with multi-agent support for up to 16 simultaneous agents in Heavy mode. Grok 4.2 (March 2026) prioritized hallucination reduction and strict prompt adherence for enterprise use cases. Grok 4.3 followed as the current default, consolidating prior version flags. On March 25, 2026, SuperGrok Lite launched at $10 per month, expanding the subscription ladder below SuperGrok ($30/month). Grok 5 was confirmed as actively training in May 2026, with Elon Musk projecting a scale of 6 to 10 trillion parameters. Fast-inference variants (Grok 4.1 Fast, Grok 4 Fast) are priced at $0.20 input and $0.50 output per million tokens, underpricing most frontier competitors. xAI raised approximately $45 billion across nine rounds from 48 investors in under three years. The Series B ($6 billion, May 2024, $24 billion valuation) was followed by a Series C ($6 billion, December 2024, $50 billion valuation). A July 2025 bridge combined $5 billion in Morgan Stanley debt with $5 billion in strategic equity. The Series D ($10 billion, September 2025) pushed valuation above $100 billion. The Series E closed January 6, 2026 at $20 billion, valuing xAI at $230 billion, with Nvidia, Cisco Investments, Andreessen Horowitz, Fidelity, Qatar Investment Authority, MGX (Abu Dhabi), and HUMAIN (Saudi Arabia, $3 billion) as key participants. On February 2, 2026, SpaceX acquired xAI in an all-stock deal forming a combined entity at $1.25 trillion, the largest private merger in history. SpaceX filed a confidential S-1 on April 1, 2026 targeting a $1.75 to $2 trillion IPO with approximately $75 billion in new capital, planned for mid-June 2026. xAI earns through API consumption, consumer subscriptions, enterprise contracts, and infrastructure rental. In 2025, xAI generated approximately $3.2 billion in revenue against $14 billion in cash burn. Consumer tiers run from free through SuperGrok Lite ($10/month), X Premium ($8/month), SuperGrok ($30/month), X Premium+ ($40/month), and SuperGrok Heavy ($300/month). Enterprise plans launched December 2025 include dedicated infrastructure, customer-managed encryption keys, SSO with SAML support, SCIM provisioning, and 90-day audit logs. The company secured a $200 million contract with the US Department of Defense in July 2025. As of May 2026, Anthropic signed an agreement to rent all Colossus 1 compute capacity, converting the supercomputer into a meaningful infrastructure-as-a-service revenue stream. Elon Musk serves as CEO as of May 2026. Michael Nicolls, formerly Vice President of Starlink at SpaceX, was appointed President on April 10, 2026, following CFO Anthony Armstrong's departure that same month. All 11 original co-founders have since left: Igor Babuschkin and Manuel Kroiss in February 2026, then Guodong Zhang, Zihang Dai, and Ross Nordeen (the last remaining co-founder) in March 2026, each following the SpaceX acquisition. Total headcount is estimated at 4,000 to 4,900 employees across offices in Palo Alto (HQ), Memphis (Tennessee), Seattle, San Francisco, and London. The Memphis operation alone employs nearly 3,000 workers at the Colossus data center complex, spanning engineers, electricians, and construction personnel. xAI's stated mission is to accelerate human scientific discovery and advance collective understanding of the universe. The company differentiates from competitors through deep integration with X (Twitter), which provides real-time data for grounding Grok responses and training subsequent model generations. xAI published its Risk Management Framework on August 20, 2025, covering model evaluation, incident response, and safety escalation. Unlike Anthropic's Constitutional AI approach, xAI focuses on factuality and information access without explicit political content filtering. Active research areas include scaling laws (targeting 6 to 10 trillion parameters with Grok 5), multi-agent orchestration, and multimodal generation including video. The company is pursuing FedRAMP High authorization, sponsored by the USDA, for government AI deployments. xAI competes directly with OpenAI (GPT-5), Anthropic (Claude), and Google DeepMind (Gemini) in frontier model development. Grok's primary advantages include native integration with X's real-time data stream, the lowest frontier consumer subscription price ($10/month SuperGrok Lite vs. OpenAI's $20/month), and vertical synergies with Tesla and SpaceX hardware. The company trails Anthropic in enterprise compliance depth and lags OpenAI in developer ecosystem breadth and plugin marketplace scale. xAI leads in raw compute infrastructure (Colossus 1 and 2 targeting 1 million Nvidia GPUs by end of 2026) and is the only frontier AI lab with integration into an active autonomous vehicle fleet and satellite communications network. xAI's regulatory position is shaped by Musk's simultaneous ownership of X, Tesla, and SpaceX, making it a unique multi-sector AI actor under scrutiny from multiple regulators. Training on X user data has attracted GDPR attention from European authorities. The company addresses this with data processing addenda incorporated into enterprise terms and a default commitment not to train on API customer data. The $20 billion Series E included sovereign wealth from Saudi Arabia (HUMAIN, $3 billion), Qatar (QIA), and Abu Dhabi (MGX), raising data sovereignty questions in Western regulatory forums. xAI holds a $200 million DoD contract and is actively pursuing FedRAMP High. Environmental criticism persists around the Memphis Colossus facility's 35 natural gas turbines (approximately 422 megawatts combined) and their NOx emissions in the Boxtown community. As of May 2026, xAI operates as the SpaceXAI division within SpaceX. The pending IPO targets a $1.75 to $2 trillion combined valuation and approximately $75 billion in new capital earmarked for Grok 5 training, Colossus expansion, and government contract growth. Grok 5, confirmed in training, is projected to exceed current frontier benchmarks significantly. The company is pursuing Wall Street enterprise clients (Apollo Global, Morgan Stanley) and expanding its DoD footprint. With Anthropic renting Colossus 1 compute, xAI is validating an infrastructure model that could compete with cloud providers. The 2026 trajectory hinges on the SpaceX IPO outcome, Grok 5 performance versus GPT-6 and Gemini Ultra 3, and whether the SpaceX merger delivers the distribution advantages Musk projected.

Mission

To accelerate human scientific discovery and advance our collective understanding of the universe.

Products

Compliance

SOC 2, HIPAA-eligible, GDPR, CCPA

Links

Website · GitHub · Twitter · LinkedIn · Blog · Docs

Frequently Asked Questions

What is xAI and what do they build?

xAI is an artificial intelligence company founded in March 2023 by Elon Musk and 11 co-founders in Palo Alto, California, with a stated mission to accelerate human scientific discovery. As of May 2026, xAI operates as the SpaceXAI division within SpaceX following an all-stock acquisition completed February 2, 2026. The company's flagship product is Grok, a large language model chatbot integrated natively into X (formerly Twitter) and available via API at $1.25 per million input tokens for the Grok 4.3 flagship. Additional products include Aurora (text-to-image generation), Grok Imagine (text-to-6-second video), Grok Voice (a real-time voice agent deployed in Tesla vehicles), and Grok Build (a terminal-based coding agent). Enterprise plans launched December 2025 offer dedicated infrastructure, SSO, SCIM, and customer-managed encryption keys for corporate customers. The company also holds a $200 million contract with the US Department of Defense and rents Colossus 1 compute capacity to Anthropic.

Who founded xAI and who is the CEO?

xAI was founded in March 2023 by Elon Musk alongside 11 co-founders recruited primarily from OpenAI, DeepMind, Google Brain, and Tesla, including Igor Babuschkin (ex-OpenAI), Manuel Kroiss, Guodong Zhang, Zihang Dai, and Ross Nordeen. Musk serves as CEO and is the sole remaining founding executive as of May 2026. Michael Nicolls, formerly Vice President of Starlink at SpaceX, was appointed President of xAI on April 10, 2026. All 11 original co-founders have departed: Babuschkin and Kroiss in February 2026, followed by Zhang, Dai, and Nordeen in March 2026, each exit coinciding with the SpaceX integration and company restructuring. CFO Anthony Armstrong also departed in April 2026 alongside Nicolls' appointment. Musk launched xAI to counter what he described as overly restrictive AI development at OpenAI (a company he co-founded and departed), filing a lawsuit against OpenAI in early 2024 alleging breach of its nonprofit mission.

How much funding has xAI raised?

xAI raised approximately $45 billion across nine rounds from 48 investors between 2023 and January 2026. Key rounds include the Series B ($6 billion, May 2024, $24 billion valuation), Series C ($6 billion, December 2024, $50 billion valuation), a July 2025 bridge combining $5 billion in Morgan Stanley debt with $5 billion in strategic equity, and the Series D ($10 billion, September 2025, $100B+ valuation). The Series E, closed January 6, 2026, raised $20 billion at a $230 billion valuation from Nvidia, Cisco Investments, Andreessen Horowitz, Fidelity, Qatar Investment Authority, MGX (Abu Dhabi), HUMAIN (Saudi Arabia, $3 billion), and Valor Equity Partners. On February 2, 2026, SpaceX acquired xAI in an all-stock deal forming a combined entity at approximately $1.25 trillion, the largest private merger in history. SpaceX filed a confidential S-1 with the SEC on April 1, 2026, targeting an IPO at $1.75 to $2 trillion with approximately $75 billion in new capital expected mid-June 2026.

What products does xAI make?

xAI's primary product is Grok, a frontier large language model available via grok.com and X (Twitter) for consumers and via API for developers at console.x.ai. Consumer subscription tiers range from free through SuperGrok Lite ($10/month), X Premium ($8/month), SuperGrok ($30/month), X Premium+ ($40/month), and SuperGrok Heavy ($300/month). API pricing for Grok 4.3 is $1.25 input and $2.50 output per million tokens; fast-inference variants start at $0.20 input and $0.50 output per million tokens. Aurora is xAI's text-to-image model using an autoregressive MoE architecture, launched December 2024 with API access added March 2025. Grok Imagine (launched July 28, 2025) generates 6-second video clips from text prompts. Grok Voice is a real-time low-latency speech agent integrated into Tesla vehicles and the Grok mobile app. Grok Build (terminal-based coding agent) is available to SuperGrok Heavy subscribers and uses the grok-code-fast-1 model. Enterprise plans (December 2025) include dedicated infrastructure, CMEK, SSO/SAML, SCIM, and 90-day audit logs with dedicated support.

Where is xAI headquartered and how big is the team?

xAI is headquartered in Palo Alto, California, with additional offices in Memphis (Tennessee), Seattle, San Francisco, and London. As of May 2026, total headcount is estimated at 4,000 to 4,900 employees across all locations. The Memphis Colossus data center complex alone employs nearly 3,000 workers spanning engineers, electricians, construction personnel, and food service staff. The Seattle and San Francisco hubs focus on research and engineering, while the London office supports European operations. The company experienced significant leadership turnover in early 2026 following the SpaceX acquisition, with all 11 original co-founders departing by March 2026. Headcount growth has been offset by targeted layoffs, including 500 data annotation workers in September 2025 and additional reductions in the Grok team restructuring of May 2026. xAI does not publicly disclose per-office headcount beyond Memphis.

What is xAI's mission or research focus?

xAI's official mission is to accelerate human scientific discovery and advance collective understanding of the universe, as stated at x.ai/company. In practice, the company emphasizes factuality and information access over content restriction, with Musk positioning Grok as 'maximally truth-seeking' compared to competitors. xAI published its Risk Management Framework on August 20, 2025 (data.x.ai/2025-08-20-xai-risk-management-framework.pdf), covering model evaluation, incident response, and safety escalation procedures. Active research priorities include scaling laws (Grok 5 targeting 6 to 10 trillion parameters), multi-agent orchestration systems (Grok 4.20 supports 16 simultaneous agents in Heavy mode), and multimodal generation spanning text, image, video, and voice. The company participates in US government AI safety programs and is pursuing FedRAMP High authorization sponsored by the USDA. Unlike Anthropic's Constitutional AI or OpenAI's RLHF safety frameworks, xAI has not disclosed named third-party red-team evaluation partners as of May 2026.

Is xAI compliant with SOC 2, GDPR, HIPAA?

xAI maintains confirmed compliance with SOC 2 (encryption in transit and at rest, enterprise zero-training commitments), HIPAA (Business Associate Agreements available via questionnaire), GDPR (Data Processing Addendum automatically incorporated into enterprise terms), and CCPA. The trust portal is available at trust.x.ai and the security page at x.ai/security. ISO 27001 certification has not been publicly confirmed as of May 2026. FedRAMP High authorization is in progress, sponsored by the USDA, targeting government deployments. Enterprise API plans include customer-managed encryption keys (CMEK), SSO with SAML, Okta, Google, and OneLogin support, SCIM provisioning, 90-day audit logs, 180-day security logs, and 365-day data access logs on dedicated infrastructure. Bug bounty is managed via HackerOne at hackerone.com/x. xAI does not train on enterprise API customer data by default; consumer grok.com inputs may be used for model improvement unless opted out via account settings.

Who are xAI's main competitors?

xAI's primary direct competitors are OpenAI (GPT-5), Anthropic (Claude), and Google DeepMind (Gemini). Against OpenAI, xAI competes on consumer pricing (SuperGrok Lite at $10/month vs. ChatGPT Plus at $20/month) and real-time data access, but trails in developer ecosystem size, plugin marketplace, and enterprise brand recognition. Against Anthropic, xAI leads in compute scale and consumer reach, but Anthropic has deeper compliance certifications (ISO 27001, SOC 2 Type II verified) and stronger enterprise safety credibility. Against Google DeepMind, xAI's advantage is speed of iteration and X-platform integration; Google leads on multimodal research, search grounding, and distribution through Workspace. No competitor can replicate xAI's integration into Tesla's autonomous vehicle fleet and Starlink's satellite network, which are structural differentiators as those hardware platforms scale. The emerging risk for xAI is co-founder talent loss and whether Grok 5 can outperform GPT-6 at launch.