xAIとは？Grokの背後にある会社

What Is xAI? The Company Behind Grok | Built In Image: Shutterstock UPDATED BY Brennan Whitfield | Mar 17, 2026 REVIEWED BY Ellen Glover | Mar 17, 2026 Summary: Elon Musk’s xAI builds products like Grok, a chatbot powered by the Grok 3 and Grok 4 AI models and real-time X platform data. Offering online search and advanced “reasoning” capabilities, xAI is a serious competitor in the generative AI space — despite data privacy and bias concerns. more Elon Musk’s xAI builds products like Grok, a chatbot powered by the Grok 3 and Grok 4 AI models and real-time X platform data. Offering online search and advanced “reasoning” capabilities, xAI is a serious competitor in the generative AI space — despite data privacy and bias concerns. xAI is an artificial intelligence startup founded by tech mogul Elon Musk in 2023 to challenge what he sees as a political bias among more mainstream AI companies — particularly OpenAI and its ChatGPT chatbot, which he has criticized for being too “woke.” What Is xAI? xAI is an AI company founded by Elon Musk to counter a perceived liberal bias in generative AI tools. xAI’s Grok chatbot is integrated with social media platform X, which is also owned by xAI, and its AI models Grok 3 and Grok 4 are powered by its high-powered Colossus supercomputer. xAI’s flagship product is Grok, a chatbot designed to be “witty,” “rebellious,” and willing to tackle controversial or “spicy” questions that other platforms typically shy away from. Grok is powered by Grok 3 and Grok 4 , xAI’s latest AI models , and runs on Colossus , a supercomputer the company built. And it is deeply integrated with X, the social media platform formerly known as Twitter, which Musk also owns. This allows Grok to draw from real-time social media content to inform its answers — a feature that sets it apart from its competitors. Like other AI systems, Grok has been known to produce false and biased information. But its novel features make xAI a top contender in the high-stakes race for generative AI supremacy. More Musk Inside Elon Musk’s Government Contracts Why Did Elon Musk Create xAI? Elon Musk created xAI as a direct challenger to OpenAI, a company Musk himself helped co-found in 2015. After parting ways with OpenAI in 2018 following an unsuccessful bid to take over as CEO , Musk grew increasingly critical of the company and the direction of the AI industry at large. When OpenAI launched ChatGPT in 2022, he praised the chatbot for being “scary good” but also warned that we are “not far from dangerously strong AI.” In April 2023, Musk told Fox News that ChatGPT was trained to be politically correct and say “untruthful things,” and criticized OpenAI for abandoning its open-source, nonprofit roots in favor of becoming a “ closed source, maximum-profit company ” aligned with Microsoft. He said he planned to build an alternative chatbot called TruthGPT, which he described as a “maximum truth-seeking AI that tries to understand the nature of the universe.” This vision would become the foundation of xAI’s Grok. By the time Musk launched xAI in July 2023, other companies like OpenAI, Google and Anthropic had already made significant headway in developing and commercializing their generative AI products. However, Musk quickly made up for lost time by hiring top AI engineers from those very same companies, as well as academia. Musk has repeatedly accused other AI companies of being corrupted by “ woke ” political correctness, claiming this ideological bias undermines their ability to seek and communicate the truth — to the point where it could be “ deadly .” In contrast, xAI aims to have “an absolute focus on truth, whether politically correct or not,” Musk said . Today, xAI’s mission is to build AI with “all-encompassing” and “far-reaching” knowledge in an effort to “advance human comprehension and capabilities,” according to its website . Its Grok chatbot has been explicitly trained to be “ extremely skeptical ” of mainstream narratives. And internal reviewers are instructed to challenge the chatbot’s responses on feminism, socialism and other progressive topics, according to Business Insider . For instance, when Grok responded that Disney’s diversity quota could help support “meaningful representation,” employees flagged the output as a violation of its principles. More on AI AI Safety, Explained xAI’s Key Technologies and Products Grok Grok is an AI chatbot integrated with social media platform X. This integration allows X users to ask Grok questions about social media posts, oftentimes fact-checking the claims made therein. Powered by a large language model (LLM) of the same name, Grok stands out for its access to real-time information on X, as well as its propensity for witty, sarcastic responses. It can communicate in several different personas — from loyal friend to unhinged comedian — and it has been programmed to answer “ spicy questions ” most other chatbots would avoid. SpeechMap.AI , a research project that tests how language models respond to sensitive or controversial prompts, ranked Grok as the most permissive AI model, complying with more than 96.2 percent of its requests. At the same time, AI safety nonprofit SaferAI ranked xAI as the least mature company in risk management practices. Over the years, Grok has added capabilities like more computing power, image generation and text-based image editing. When Grok 3 launched in 2025, xAI introduced DeepSearch — a feature designed to synthesize information and draw conclusions about any conflicting facts or opinions it discovers. xAI also offers an API for developers to integrate Grok models into their own applications. Grok 3 Grok 3 is a multimodal AI model released by xAI in February 2025. Serving as the underlying model for the free version of the Grok chatbot, it is designed to handle a wide range of tasks, including text generation , image creation and complex reasoning — with “reasoning” being the ability to break down problems into several smaller steps, or “thoughts,” before generating a final answer. The model operates in three distinct modes: Think: Relies on a less computationally intensive “mini” version of Grok 3, and can be used to solve simple queries about topics like math, science and coding. Big Brain: Activates the full-sized version of Grok 3 for more complex, multi-layered tasks, offering deeper analysis and more accurate answers. DeepSearch: Enables Grok 3 to browse the web, verify sources and pull in real-time information, making it useful for tasks like news gathering, market tracking and fact-checking. xAI is positioning DeepSearch as both an AI-powered search engine and a precursor to its version of AI agents , where models will not only be able to think like humans, but complete complex tasks like them, too. Grok 4 Released in mid-2025, xAI claims that Grok 4 builds on its predecessor with sharper reasoning, expanded domain knowledge in areas like science, law and healthcare, and a longer context window to process more complex prompts. The model integrates “native tool use” and real-time search to help improve its ability to verify facts and handle intricate queries. While Musk has described it as a step toward “superhuman intelligence,” independent testing of its accuracy and reliability is still limited. Colossus xAI built Colossus, the world’s largest AI supercomputer , in Memphis, Tennessee to train Grok and support Musk’s other companies. xAI was originally told it would take two years to build Colossus, but it finished the project in just 120 days. Originally built with 100,000 Nvidia Hopper graphics processing units (GPUs), the company doubled its computing power to 200,000 GPUs after 92 days. Next, it plans to scale Colossus up to 1 million GPUs . More on Elon Musk The Supercomputer Behind Grok: What to Know About Elon Musk’s Colossus Relationship with Other Musk Companies Elon Musk’s companies are sometimes interconnected, and we’ve seen several instances of this with xAI. X X is the social media platform formerly known as Twitter, which Musk bought in 2022 for $44 billion. In addition to changing its name from Twitter to X, he also loosened its content moderation policies, arguing that the platform was suppressing viewpoints that didn’t adhere to liberal or politically correct ideologies xAI’s Grok has always been integrated with X, allowing users to summon the chatbot into any conversation to answer their questions. In March 2025, Musk announced that xAI had acquired X in an all-stock that valued the social media company at $33 billion. As a result of the deal, Musk said the data, models, compute, distribution and talent of the two companies would be combined. xAI’s models are trained on X’s user data, and it powers personalized experiences for X users. Tesla Grok is integrated as a Siri-like feature in select Tesla vehicles , allowing for users to choose Grok’s personality, hold conversations and ask for information on the go in their own car. When xAI first launched, Musk said xAI and his electric car company Tesla would also work collaboratively in a mutually beneficial relationship. Musk has said that Tesla engineers have learned a lot from xAI engineers in their efforts to develop unsupervised full self-driving capabilities, and that it has been helpful in building up Tesla’s new data center . xAI’s work could also contribute to Optimus , Tesla’s humanoid robot , plus xAI also buys Tesla’s Megapacks to power its Colossus supercomputer. Tesla shareholders have sued Musk for starting xAI, which they argue is a competing AI company. The lawsuit also alleges that xAI has poached staff and resources, like a shipment of Nvidia chips originally intended for Tesla. Neuralink Neuralink , a Musk-owned company developing a brain-computer interface , doesn’t have a known relationship with xAI, but it does help Neuralink users communicate more efficiently. A nonverbal man with a Neuralink implant explained in a video how he uses his thoug