Anthropic has closed a deal to raise $13 billion from investors in a new funding round that nearly triples its valuation to $183 billion, including dollars raised a larger-than-expected haul that makes the artificial intelligence company one of the most valuable startups in the world. The financing, one of the largest to date for an AI company, was led by investment firm Iconiq Capital alongside co-leads Fidelity Management and Research Co. and Lightspeed Venture Partners.