Anthropic has officially overtaken OpenAI as the world's most valuable artificial intelligence company. The San Francisco-based firm announced a $65 billion fundraising round that values it at $900 billion well ahead of OpenAI's most recent valuation of $730 billion in what represents one of the fastest valuation climbs in technology history.

Just three months ago, Anthropic was valued at $380 billion. The new round, led by Greenoaks Capital, Sequoia Capital,........

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