Anthropic is having a busy week. On Thursday, the San Francisco-based AI lab announced it had raised $65 billion in a new funding round that valued the company at $965 billion, making it the most valuable AI startup in the world.

On the same day, it also shipped Claude Opus 4.8, a new AI model that Anthropic says is less likely to deceive users or cooperate with misuse than its predecessors. In the same announcement, Anthropic said it expects to bring its Mythos-class models to all customers “in the coming weeks.”

Mythos, the existence of which was first reported by Fortune in March, is notable for its coding and cyber capabilities, including the ability to find vulnerabilities in existing software and chain these vulnerabilities together to execute sophisticated cyber attacks. The model has raised concerns that it could allow hackers to easily compromise the networks and software that control critical infrastructure, from financial systems to electric grids, and Anthropic has so far allowed only a select group of users to access the model in order to find vulnerabilities in their own software and patch them. It said it would not release the model more widely until it had developed safeguards to make it more difficult for hackers to exploit its capabilities for malicious purposes.

More from Yahoo Scout How does Claude Opus 4.8 improve upon previous versions? What are Anthropic's Mythos model capabilities? What drove Anthropic's record $965 billion valuation? What challenges is Anthropic facing with AI model deployment?

The spate of news comes as Anthropic races toward one of the most anticipated IPOs of the year, with the company reportedly quietly working on public market preparations even as it continues to raise at record-breaking private valuations.

In February, Anthropic was valued at $380 billion after closing its Series G. Since then, the company has gained significant momentum: it has seen a surge in consumer users, widespread adoption of its coding tool, Claude Code, by businesses, and the debut of its powerful Mythos model in a limited preview. The company’s enterprise sales growth has been particularly strong. By May, the company said its annualized run-rate revenue had crossed $47 billion, up from just $10 billion at the end of 2025—a rate of growth that is unprecedented for a company of this size.

Anthropic’s most recent funding round, its Series H, was led by Altimeter Capital, Dragoneer, Greenoaks, and Sequoia Capital, with Capital Group, Coatue, D1 Capital Partners, GIC, ICONIQ, and XN co-leading. Of the $65 billion total, $15 billion represents previously committed investment from hyperscalers, including $5 billion from Amazon.

The numbers are impressive even by the skyrocketing valuations of the current AI boom—it also leapfrogs rival OpenAI’s most recent valuation of $852 billion, set when the company closed its own record funding round in March.