Amazon vs. Perplexity Comet: The Court Ruling That Could Define the Future of AI Shopping Agents

A federal judge in San Francisco just handed Amazon a preliminary injunction against Perplexity’s Comet browser — blocking its AI agent from shopping on Amazon on behalf of users. It’s the first major legal test of agentic commerce, and the ruling has implications far beyond one browser and one retailer.

What Happened

On March 10, 2026, U.S. District Judge Maxine Chesney granted Amazon a preliminary injunction against Perplexity AI, ordering the company to stop its Comet browser from accessing password-protected sections of Amazon’s platform. The order also requires Perplexity to destroy any Amazon data it collected through Comet.

The lawsuit itself isn’t new. Amazon filed it back in November 2025, accusing Perplexity of using AI shopping agents that accessed Amazon accounts without the platform’s authorization. But the injunction is what turns this from a legal filing into a precedent-setting moment.

Judge Chesney found that Amazon presented “strong evidence” that Perplexity’s Comet browser accessed Amazon user accounts “with the Amazon user’s permission but without authorization by Amazon.” That distinction — between a user giving permission and a platform granting authorization — is the crux of the entire case.

Amazon’s claims rest on two statutes: the federal Computer Fraud and Abuse Act (CFAA) and California’s Comprehensive Computer Data Access and Fraud Act. The judge determined Amazon is likely to succeed on both.

Perplexity has until March 16 to seek a stay from the Ninth Circuit before the order takes effect. The company called the lawsuit a “bully tactic,” but hasn’t detailed its full legal strategy publicly.

What Is Perplexity Comet, Exactly?

Comet is Perplexity’s AI-first browser, built on Chromium, that goes well beyond traditional web browsing. Where a normal browser renders web pages, Comet interprets content, executes tasks, and automates multi-step workflows.

Its core selling point is agentic capability. Users can ask Comet to summarize page content, organize tabs, compare products across multiple sites, aggregate reviews, fill out forms, and — critically — complete purchases. The AI agent can navigate the web autonomously, interacting with tabs, emails, calendars, and e-commerce platforms on the user’s behalf.

Under the hood, Comet’s agentic behavior runs inside the browser’s renderer process via an extension that isn’t visible in the standard extensions UI but shows up in DevTools. For Pro users, the Comet Agent is powered by Claude Sonnet 4.6 by default, with Opus 4.6 available for Max subscribers.

Pricing follows a freemium model: free for basic features, Comet Plus at $5/month, Pro at $20/month (with unlimited searches and advanced models), and Max at $200/month for enterprise-level workflows. Comet is available on both macOS and Windows, with iOS pre-orders now open.

Why This Ruling Matters Beyond Amazon and Perplexity

This case isn’t really about one browser accessing one retailer. It’s about a fundamental question: when an AI agent acts on behalf of a user, does the platform have the right to block it — even if the user explicitly gave the agent permission?

Judge Chesney’s ruling treats user consent and platform authorization as two separate legal requirements. That’s a significant precedent. If it holds, it means every e-commerce platform, social network, and web service could potentially block AI agents from operating on their platforms, regardless of what the user wants.

The broader implications touch several areas:

For AI agent developers: Any company building agents that interact with third-party platforms now faces legal risk under the CFAA. The “user authorized it” defense may not be enough.

For the agentic commerce market: Analysts at Gartner have already flagged concerns about AI browsers, publishing a December 2025 report titled “Cybersecurity Must Block AI Browsers for Now.” The Amazon ruling validates those concerns from a legal angle.

For platform economics: Amazon’s business model depends on controlling the shopping experience — product placement, advertising, recommendations. An AI agent that bypasses all of that and goes straight to purchase threatens the entire retail media ecosystem, which generated over $50 billion for Amazon in 2025.

How Comet Compares to ChatGPT Atlas

Perplexity Comet isn’t the only agentic browser on the market. OpenAI’s ChatGPT Atlas is the most direct competitor, and the two take fundamentally different approaches.

Atlas separates the browsing process from the agent entirely, keeping them architecturally distinct. Comet embeds its agent directly into the browser’s renderer process. In practice, this means Comet feels more integrated — the AI is always present — while Atlas requires users to manually activate Agent Mode.

On the research front, Comet has the edge. It keeps sources visible, answers inline, and cites where every insight comes from — a natural extension of Perplexity’s search DNA. Atlas is stronger for task execution workflows like booking appointments, composing emails, and multi-step automations, benefiting from ChatGPT’s memory features.

Pricing is comparable: Atlas requires a ChatGPT Plus subscription ($20/month) for Agent Mode, while Comet Pro sits at the same $20/month tier. However, Comet offers a more generous free tier with basic agentic features available at no cost.

One key difference post-ruling: Atlas hasn’t faced the same legal challenges. OpenAI may be watching this case closely to see how it shapes the boundaries for its own agentic browser.

Community reception for Comet sits at roughly 4.2 out of 5 stars across aggregated reviews. TechCrunch praised its “genuinely useful AI features,” while The Verge highlighted the accessibility of making advanced agentic browsing free. On the technical side, Hacker News threads have raised concerns about prompt injection vulnerabilities, and security researchers have flagged that autonomous agents inside the browser stack create new attack surfaces.

What to Watch Next

The immediate timeline is clear: Perplexity has until March 16 to appeal to the Ninth Circuit. If they don’t get a stay, the injunction takes effect and Comet can no longer access Amazon accounts.

But the longer game is more interesting. This case will likely set the legal framework for how AI agents interact with third-party platforms for years to come. Several scenarios are worth tracking:

Settlement or API deal: Amazon and Perplexity could reach an agreement where Comet accesses Amazon through an official API, giving Amazon control over the experience while allowing Perplexity to offer shopping features. This is the outcome most favorable to both parties.

Ninth Circuit appeal: If Perplexity appeals and wins a stay, the case goes to the appeals court, potentially producing a more authoritative ruling on whether the CFAA applies to AI agents acting at a user’s direction.

Industry-wide response: Other platforms — Google, Walmart, eBay — are likely watching closely. A win for Amazon could trigger a wave of similar restrictions against agentic browsers across the web.

Legislative action: Congress has been eyeing AI regulation broadly. A high-profile CFAA case involving consumer-facing AI agents could accelerate legislative efforts to define the legal status of AI agents.

For now, Perplexity Comet remains functional for everything except Amazon shopping. The browser’s core features — AI-powered search, tab management, content summarization, cross-site research — are unaffected by the ruling.

FAQ

Is Perplexity Comet free to use?
Yes, Comet offers a free tier with basic AI browsing features. Premium tiers include Comet Plus ($5/month), Pro ($20/month) with advanced AI models and unlimited searches, and Max ($200/month) for enterprise workflows.

Can Perplexity Comet still shop on Amazon?
As of the March 10, 2026 ruling, Comet is barred from accessing password-protected Amazon accounts. Perplexity has until March 16 to appeal. Shopping features on other platforms remain unaffected.

What is agentic commerce?
Agentic commerce refers to AI systems that don’t just assist but act autonomously on behalf of shoppers — browsing, comparing, and purchasing products based on user intent and context, without requiring the user to manually navigate each step.

How does Perplexity Comet compare to ChatGPT Atlas?
Both are AI-first browsers built on Chromium. Comet excels at research with inline citations and source transparency. Atlas is stronger at task execution with its memory features. Both have a $20/month Pro tier, but Comet offers more functionality in its free tier and works on both macOS and Windows, while Atlas is currently macOS-only.

Is Perplexity Comet safe to use?
Comet has a 4.2/5 average user rating and is generally well-regarded. However, security researchers have identified prompt injection vulnerabilities, and Gartner has recommended caution with AI browsers broadly. Standard precautions apply — avoid granting agent access to sensitive accounts without understanding the risks.

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