Anthropic raises $65 billion in Series H funding, surpassing OpenAI to become the most valued AI startup

Anthropic raised $65 billion in a Series H funding round, with major investors including Altimeter Capital, Dragoneer, Greenoaks, and Sequoia Capital. The funding package included $5 billion from Amazon. Following the deal, Anthropic's valuation approached $1 trillion, nearly three times higher than its $380 billion valuation in February.

Anthropic announced new AI models: Claude Opus 4.8 and Claude Mythos Preview, a closed system offering enhanced cybersecurity capabilities for corporate clients. The company's Claude AI assistant and Claude Code service (used by software developers) have driven growth; annual revenue grew to $47 billion from about $10 billion in the prior year.

Anthropic officially overtook OpenAI in market valuation and became the largest AI company among Silicon Valley's private startups. For context: OpenAI was valued at $852 billion following a $122 billion funding round in March.