Alphabet Inc.’s Google would be forced to unwind its partnership with artificial intelligence startup Anthropic if a federal judge accepts the US Justice Department’s proposal to resolve a landmark antitrust case over online search.

If a judge orders Google to sell Chrome, it could dramatically upend the multibillion-dollar online search business.

Alphabet Inc.’s Chrome browser could go for as much as $20 billion if a judge agrees to a Justice Department proposal to sell the business, in what would be a historic crackdown on one of the world’s biggest tech companies.