A Washington, D.C. programmer is taking Anthropic to court over the way it sold Claude Max. Karl Kahn filed Kahn v. Anthropic PBC in the Northern District of California on June 15, asking for class-action status and refunds for customers who bought the higher-priced Max plans.
The complaint focuses on a simple promise: Claude Pro costs about $17 to $20 a month, while Max 5x costs $100 and Max 20x costs $200. Kahn says he upgraded to Max 20x in April after seeing the “20x” label, then found that a five-hour work session consumed about 15% of his weekly allowance.
His lawyers argue that the actual usage available under Max 5x and Max 20x falls well below what the names advertise. The suit also says ordinary users cannot measure the limit in any practical way because Anthropic does not expose how messages, long prompts, and file attachments are converted into quota.
The dispute follows earlier anger around Claude Code, when Anthropic added weekly caps for heavy users in July 2025. This time, the complaint asks a court to treat the marketing as fraudulent and to refund subscribers who bought Max after launch. Anthropic had not responded to the allegations, and the claims have not been proven.
The larger issue is the economics of flat-rate AI. Subscribers pay a fixed fee, but the cost of each request changes with context length, files, and coding sessions. AI companies want fair-use rules and dynamic caps; users want a clear boundary before they pay for a “20x” plan. Kahn’s lawsuit pulls that black box into court.
The case may turn on whether a label like “20x” counts as a measurable usage promise or a loose marketing shorthand. Either way, it lands at a sensitive moment for frontier AI companies, whose revenue quality and subscription economics are already under investor scrutiny.
Sources: CocoLoop, Engadget report on the Claude Max usage-limit lawsuit, and The Next Web coverage of Anthropic’s $200 Claude plans.