xAI was founded in March 2023 by Elon Musk, who had been publicly critical of OpenAI’s direction since his departure from its board in 2018. Based in the San Francisco Bay Area, xAI attracted experienced researchers from Google DeepMind, OpenAI, and other top AI labs. The company raised $6 billion in a Series B round in late 2024, reaching a valuation of approximately $50 billion.
The company’s primary product is Grok, a large language model that’s integrated into X (formerly Twitter). Grok was designed with a personality that Musk described as having a “sense of humor” and being willing to answer questions that other AI models might refuse. It has access to real-time X posts, giving it a unique data advantage for current events.
xAI built one of the world’s largest GPU clusters, reportedly assembling over 100,000 Nvidia H100 GPUs in Memphis, Tennessee, in a remarkably short timeframe. This infrastructure powers the training of their Grok models, which have progressed through multiple versions with improving performance on benchmarks.
The company also open-sourced the weights of Grok-1, a 314-billion-parameter mixture-of-experts model, in March 2024. While it wasn’t the most competitive model at the time of release, the move signaled xAI’s willingness to engage with the open-source community. xAI’s trajectory has been defined by speed and scale — moving fast to build both the models and the massive compute infrastructure needed to train them.
