Amazon has secured a court order blocking Perplexity AI from accessing parts of its website using AI agents.
In November 2025, the e-commerce titan sent a cease-and-desist letter to Perplexity, demanding it immediately halt the use of Comet AI agents in the Amazon Store.
In the letter, Amazon said Perplexity’s AI agents accessed the site and user accounts without authorization, violating its Conditions of Use and computer misuse statutes.
In a ruling from the U.S. District Court for the Northern District of California, Judge Maxine M. Chesney granted Amazon’s request for a preliminary injunction against Perplexity AI over how its technology interacts with Amazon’s systems.
Court documents show Amazon presented evidence that the Comet browser could access private Amazon accounts with a user’s permission but without permission from Amazon itself, allowing the AI system to obtain account information and transmit it to Perplexity’s servers while performing tasks for users.
“Additionally, Amazon has submitted essentially undisputed evidence that it has expended significantly more than $5,000 in responding to such circumstances, including, for example, costs attributable to numerous hours spent by Amazon employees in developing tools to block Comet’s access to its private customer accounts and detecting future unauthorized access by Comet.”
Judge Chesney ruled that allowing the activity to continue could cause irreparable harm, noting that courts have repeatedly found unauthorized access to protected computer systems sufficient grounds for injunctive relief.
Perplexity argued that blocking the technology could harm its competitive position and erase a multimillion-dollar investment in developing the Comet browser.
But the court concluded that the balance of hardships favored Amazon, emphasizing that Perplexity could still operate its browser across the rest of the web and was only being barred from accessing Amazon’s password-protected systems.
Under the order, Perplexity and its affiliates are temporarily barred from accessing Amazon’s protected systems using AI agents and must destroy any Amazon customer data obtained through those systems.
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