xAI Glossary

AI company founded 2023 by Elon Musk after his departure from the OpenAI board. Makers of the Grok model family and the Memphis-based *Colossus* training-cluster infrastructure.

xAI is an AI company founded in March 2023 by Elon Musk, several years after his 2018 departure from the OpenAI board over disagreements about the lab’s direction. The company develops the Grok family of large language models, marketed as the somewhat-edgier alternative to Anthropic’s Claude and OpenAI’s GPT, with deep integration into Musk’s X (formerly Twitter) platform. xAI’s most consequential infrastructure achievement has been the Colossus training cluster in Memphis, Tennessee — one of the largest concentrated GPU deployments in the world as of late 2024, with multiple subsequent expansions.

For this Dictionary the most relevant recent event is the xAI/Anthropic data centre deal announced May 7, 2026, in which Anthropic agreed to take significant compute capacity from xAI’s infrastructure. Simon Willison’s link blog covered the announcement and characterised it as one of the more structurally surprising moves of the current period (competitors sharing physical infrastructure under commercial terms). The deal is likely to surface in a future Dictionary entry on AI-industry vertical integration; for now, xAI is named here as a structural participant in the frontier-model ecosystem the operator’s work sits inside.

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