The suit, brought on behalf of Washington D.C. subscriber Karl Kahn and others who bought the Max 5x and Max 20x plans since April 2025, claims the company oversold how much computing power buyers would actually receive.

The lawsuit - filed Monday in the Northern District of California on behalf of Washington DC resident Karl Kahn and others who subscribed to the plans since April 2025 - targets Anthropic's Max 5x and Max 20x tiers priced at $100 and $200 per month respectively. It accuses the company of misleading customers by advertising these plans as providing five and twenty times the usage capacity of the standard Pro subscription, when in reality the actual limits fall well short of those claims. The allegations draw heavily from emails Anthropic sent to subscribers in July 2025 that outlined the expected weekly usage allowances for each tier at the time.

According to the complaint, Kahn upgraded to the Max 20x plan in April of this year after increasing his reliance on Claude for coding work. He soon discovered he was exhausting his weekly limits rapidly, including burning through 15 percent of his allowance during a single five-hour session. The suit seeks refunds for affected customers and a judicial finding that Anthropic's marketing of the high-tier plans was fraudulent.