xAI
ai labUnderstand the Universe
xAI was founded in March 2023 by Elon Musk alongside researchers from DeepMind, Google, and Microsoft. The company develops advanced AI models under the Grok brand and operates at massive compute scale through its Colossus supercomputer cluster in Memphis, Tennessee. The company raised $6 billion in Series B funding at a $24 billion valuation in May 2024, followed by a $6 billion Series C at $50 billion in December 2024. In March 2025, xAI acquired X Corp. (formerly Twitter) for $33 billion. A $10 billion debt/equity raise in July 2025 valued the company above $120 billion. In January 2026, xAI closed a $20 billion Series E round with investors including Valor Equity Partners, Fidelity, Qatar Investment Authority, NVIDIA, and Cisco Investments. In February 2026, SpaceX acquired xAI in an all-stock deal valuing xAI at $250 billion. By March 2026, all original co-founders except Elon Musk had departed the company. xAI's flagship product, Grok, serves approximately 600 million monthly active users across the X platform and Grok mobile apps. The latest model, Grok 4.20, features a 2 million token context window and is available via API with pricing starting at $2.00/$6.00 per million input/output tokens. Grok 5 is currently in training. Beyond language models, xAI offers Grok Voice (real-time voice agent API), Grok Imagine (image and video generation), Grokipedia (AI-powered knowledge base), and an AI Game Studio. The company holds a $200 million contract with the U.S. Department of Defense for military AI applications.
Tools by xAI
Other AI tools from the same organization.
AI Models by xAI
Large language models from the same organization.
| Model | Context Window | Price (In / Out per M) |
|---|---|---|
| Grok 4.20 Multi-AgentCurrent | 2.0M | $2.00 / $6.00 |
| Grok 4.20Current | 2.0M | $2.00 / $6.00 |
| Grok 4.1 FastCurrent | 2.0M | $0.20 / $0.50 |
| Grok 4 FastCurrent | 2.0M | $0.20 / $0.50 |
Latest News about xAI
Recent coverage and updates
AWS Plans to Add SpaceXAI's Grok to Bedrock, But Enterprise Buyers Aren't Interested
Amazon Web Services is in talks to add SpaceXAI's Grok models to its Bedrock AI platform, according to a Business Insider exclusive. But enterprise security leads are calling it 'the revenge porn edgelord LLM' and demand is somewhere between 'no' and 'why would you ask me that.' The real play may be about locking SpaceXAI into Amazon's Trainium chips ahead of its IPO.
Musk Says SpaceX-Anthropic Deal Is 180-Day Lease, Not 3-Year Commitment
SpaceX's IPO filing and Elon Musk are telling investors two fundamentally different stories about the company's marquee AI compute deal with Anthropic. The S-1 registration statement implies a ~$45 billion, 3-year commitment through May 2029, while Musk says the deal is just a 180-day lease with 90-day mutual cancellation — a maximum $7.5 billion obligation. The $37.5 billion gap in contracted revenue raises disclosure questions as SpaceX's IPO roadshow approaches on June 8.
Anthropic Hits $965B Valuation to Top OpenAI, Drops Claude Opus 4.8
Anthropic raised $65 billion in Series H funding at a $965 billion valuation, officially surpassing OpenAI as the world's most valuable AI startup. The company also released Claude Opus 4.8, its 'most honest' model yet, alongside new developer tools including dynamic workflows and effort control.
SpaceX IPO Filing Reveals Anthropic Pays $15B a Year for AI Compute
SpaceX's IPO filing reveals Anthropic is paying $1.25 billion per month — $15 billion annually — for GPU access through 2029. The deal, spanning 220,000+ NVIDIA GPUs across two data centers, comes as Anthropic nears its first-ever quarterly profit and SpaceX's AI segment burns $2.5 billion per quarter.
Pentagon Tests OpenAI and Google AI to Replace Anthropic's Claude
The Pentagon is testing AI models from OpenAI and Google to replace Anthropic's Claude, after Defense Secretary Hegseth designated the company a supply-chain risk. The tests began in early March with 25 'power users' across the department, while Anthropic battles the designation in court arguing it could cost billions.
Anthropic in Talks to Use Microsoft Maia 200 Chips for Claude
Anthropic is in talks to adopt Microsoft's custom Maia 200 AI chip for its Claude models, adding yet another silicon partner to a portfolio that already includes NVIDIA, AWS Trainium, Google TPUs, and a newly revealed $1.25B/month SpaceX compute deal.
Similar Companies
Other organizations building in the same space.
OpenBMB
open source
Open-source efficient AI models and agent infrastructure
AI4Finance Foundation
open source
Open-source financial AI research and tooling
Tsinghua University
enterprise
Research university with active AI and foundation-model work
Prior Labs
startup
Tabular foundation models for structured data
Cactus Compute
startup
On-device AI with cloud fallback
OpenMOSS
open source
Open research for LLMs and multimodal foundation models