SpaceXAI (formerly xAI) is an American artificial intelligence and social media company founded by Elon Musk in 2023. Since February 2026 it has been a wholly owned subsidiary of SpaceX, and in July 2026 it rebranded from xAI to SpaceXAI. It develops the Grok series of large language models and AI compute infrastructure.
SpaceXAI (formerly xAI) is an American technology company founded by Elon Musk on March 9, 2023, working in artificial intelligence, social media and technology. Since February 2026 it has been a wholly owned subsidiary of SpaceX — on February 2, 2026 SpaceX acquired xAI in an all-stock transaction that valued xAI at $250 billion and the combined entity at $1.25 trillion. In July 2026 the company rebranded from xAI to SpaceXAI, complete with a new logo.
Its flagship products are the generative AI chatbot Grok, the Grokipedia online encyclopedia, and the social network X (formerly Twitter), acquired in March 2025 in an all-stock deal valuing X at $33 billion. The company operates its own compute infrastructure, including the Colossus supercomputer in Memphis, planned to scale to at least one million GPUs.
It was founded by Elon Musk and a team of 11 AI researchers including Igor Babuschkin (formerly Google DeepMind). By 2025 xAI had raised over $12 billion from investors including Andreessen Horowitz, Sequoia Capital, Lightspeed, Tribe Capital, BlackRock and Fidelity, and in July 2025 it received a $200 million U.S. Department of Defense contract. Michael Nicolls has served as the company's president since April 2026.
Founders
South African–born American entrepreneur; CEO of Tesla and SpaceX, founder of xAI and The Boring Company, owner of X Corp.
German AI researcher previously at DeepMind and OpenAI; one of xAI's founders in 2023.
Chinese–Canadian AI researcher specializing in mathematical reasoning; co-founder of xAI.
American AI engineer previously at OpenAI; one of xAI's founders.
Austrian AI engineer previously at Google DeepMind; co-founder of xAI.
American mathematician and AI researcher specializing in neural-network theory (Tensor Programs); co-founder of xAI.
Chinese AI researcher, co-author of Transformer-XL and XLNet architectures; co-founder of xAI.
German AI researcher previously at DeepMind; one of xAI's founders.
Hungarian AI researcher, creator of the Inception/GoogLeNet architecture and adversarial-examples concept; co-founder of xAI.
Chinese AI researcher with a PhD from the University of Toronto; co-founder of xAI.
Canadian AI researcher, University of Toronto professor and co-creator of the Adam optimizer; co-founder of xAI.
American software engineer previously at Tesla; co-founder of xAI.
xAI first open-source model with 314 billion parameters. Mixture of Experts architecture (8 experts, 2 active per token), 64 layers. Released under Apache 2.0 in March 2024.
xAI second-generation flagship model with multimodal capabilities and image generation via FLUX by Black Forest Labs. Weights available on HuggingFace (~500 GB, 42 files). Requires 8× GPU with >40 GB memory each.
A smaller, faster variant of Grok-2 from xAI. Offers a balance between response speed and quality at lower compute cost.
xAI third-generation flagship model, trained on the Colossus supercomputer (200,000 GPUs). Features Think mode (reasoning), DeepSearch and DeeperSearch. API: $3/$15 per 1M input/output tokens.
Smaller, faster variant of Grok 3 from xAI with reasoning capabilities (Think mode). Released alongside Grok 3. Per Wikipedia, this model is now marked as discontinued.
xAI fourth-generation flagship model with native tool use (function calling) and real-time search integration. Available in standard and Heavy (SuperGrok Heavy) tiers. Released July 9, 2025.
Incremental update to Grok 4 with improved reasoning, multimodal understanding, and reduced hallucination rates. Fast variant (2M token context) available for agentic workflows. Released November 17, 2025.
Classification
