Amid an unprecedented valuation battle between ChatGPT and Anthropic raging in the private markets ahead of their respective IPOs in a few months, Bloomberg reported that shortly after releasing its latest Claude Opus 4.8, Anthropic raised $65BN in a funding round that will nearly triple the start-up’s valuation and see it surpass arch-rival OpenAI as the most valuable AI lab.The Claude chatbot maker was valued at $900bn, not including the new investment, as part of the fundraising led by Altimeter Capital, Dragoneer, Greenoaks and Sequoia Capital.The round comes just three months after Anthropic raised $30bn in a deal valuing it at $350bn as the popularity of its tools for software developers and workplace customers has propelled extraordinary growth and given it an edge over OpenAI, which was most recently valued at $852bn.“Claude’s latest advancements have driven large-scale adoption among the world’s most demanding organisations. This momentum positions Anthropic to lead the next phase of AI innovation,” said Brad Gerstner, founder and CEO of Altimeter Capital.While Anthropic’s run-rate revenue, a metric prefered by start-ups which estimates annual revenues based on short-term performance, crossed $47bn this month, some have expressed skepticism that the number is legitimate, with many suggesting that double counting and even extapolating of outlier is the reason behind the surge.If true (and things in the press should be taken with grains of salt), this one customer was reported as $6b of ARR for OAI/Anthropic ($500m*12) the month this happened.