x. ai is a company focused on developing advanced artificial intelligence technologies, specifically through their Grok language models. They offer an API that allows developers to build on their Grok foundation models, which are characterized by state-of-the-art reasoning capabilities. The company is running a public beta program to encourage the use of their API and provides free credits for developers during this period. Their recent release, Grok-2, showcases their cutting-edge advancements in AI language models. x. ai also provides career opportunities for roles related to AI engineering and research, particularly in reasoning and data.