Anthropic has secured a $183 billion post-money valuation, more than double its March figure of $61.5 billion.
The AI startup continues to attract strong investor interest despite broader tech spending concerns.
Its success underscores the surge in funding flowing into artificial intelligence.
The company said the investment will expand enterprise capacity and safety research.
It also plans international growth while building more interpretable AI systems.
Anthropic highlighted its focus on creating reliable and steerable large models.
Revenue growth has been rapid, climbing from $1 billion in January 2025 to $5 billion by August.
The latest funding round was co-led by Fidelity and Lightspeed Venture Partners.
Other investors include Blackstone, Coatue, and Qatar’s sovereign wealth fund.
Anthropic, backed by Google and Amazon, is known for its Claude AI models.
It recently unveiled Opus 4.1, boosting performance in coding and reasoning.
The startup has positioned Claude as a competitor to ChatGPT and Gemini.
U.S. startup funding jumped nearly 76% in the first half of 2025, led by AI deals.
Anthropic also offered Claude to the U.S. government for just $1 to win adoption.
Meanwhile, Amazon is reportedly weighing another multibillion-dollar investment.
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