Tension between Sam Altman and Dario Amodei was evident at the recent artificial intelligence summit, where both avoided any eye or physical contact, reflecting a rivalry that transcends the professional realm and is now newsworthy due to their significant roles in global technological and economic evolution. Altman leads OpenAI, which is preparing for an IPO with a valuation of $730 billion, while Amodei, at the helm of Anthropic, has just closed a funding round that values his company at $380 billion. Although they share investors and close circles, their relationship has deteriorated following a series of disagreements, the most recent being OpenAI's acquisition of Openclaw (formerly Clawdbot). Anthropic, which had built Openclaw on its Claude model, sued the project for trademark infringement and excessive token consumption, even blocking access to its API. OpenAI's subsequent purchase of Openclaw was seen as a direct provocation. Both represent opposing visions born from an internal split at OpenAI, an organization founded by Altman and Elon Musk, which brought Amodei on board in 2016 as head of AI safety. They collaborated for years, but differences over safety and the pace of AI model development became insurmountable. Amodei insisted on prioritizing safety and rigor, while Altman focused on expansion and attracting investors. Musk's departure from OpenAI shifted power towards Altman, and two years later, Amodei left the company to found Anthropic with his sister Daniela and other former colleagues. OpenAI's transformation into a for-profit entity and the distribution of shares created further tensions, with Altman retaining the majority, surprising many. Musk has publicly accused Altman of being a "fraud" and has taken the conflict to court, feeling betrayed by OpenAI's evolution. Amodei, considered key in the company's founding, has occasionally aligned with Musk, who has praised Claude, Anthropic's model, despite competing with his own AI projects. Anthropic was founded with the mission of prioritizing safety and control, even if it meant progressing more slowly. For Amodei, aware of the risks of AI, the last phase under Altman's leadership was particularly tense. The rivalry intensified after the OpenAI crisis in November 2023, when Altman was temporarily ousted by the board before being reinstated under internal pressure. During that period, Amodei was considered a potential replacement, and a merger between the two companies was even contemplated, but he rejected both options. Since then, competition has been open: simultaneous launches, cross-hiring, competing advertising campaigns like the recent Super Bowl, and a constant struggle for contracts with large companies and governments. ChatGPT and Claude compete in a rapidly growing market, with millions of users and numerous common investors, such as Sequoia and Founders Fund. However, differences in their backers also shape each company's profile: Anthropic is supported by Alphabet (Google), Amazon, and Salesforce, while OpenAI has backing from Softbank, Thrive Capital, and sovereign funds from the Middle East. OpenAI's involvement in the Stargate project alongside Oracle and under the auspices of the White House reinforces its institutional profile. The race between the two companies remains open, setting the pace for innovation in artificial intelligence.