PerplexityのPersonal Computer、Windows PCをAIエージェントに変える機能を拡張Perplexity’s Personal Computer turns Windows PCs into AI agents

Perplexity has extended its agentic Personal Computer tool to Windows, bringing a feature it first launched for Mac in April to the world's most widely used desktop operating system. The move matters because it puts a general-purpose AI agent in front of the largest possible base of PC users, and it reflects a broader industry push to move AI beyond chat windows and into tools that can actually operate a computer on a person's behalf.

According to Perplexity, Personal Computer for Windows works much like the Mac version, operating as a "general-purpose" AI assistant that can be used as a locally run AI system. Rather than simply answering questions, an agentic tool of this kind is designed to take actions across a machine, potentially navigating applications, handling multi-step tasks, and following instructions that go beyond a single prompt. The framing as a general-purpose assistant suggests the feature is meant to be broadly applicable across everyday workflows rather than tied to one narrow use case.

The expansion follows a familiar pattern for how new AI capabilities reach users: a launch on one platform, followed by wider availability as the software matures. Perplexity introduced the Mac version in April, and bringing the same concept to Windows significantly enlarges the addressable audience, since Windows accounts for the majority of desktop computers globally. For a company that has built its reputation primarily as an AI-powered answer engine, offering a system-level agent represents a step toward becoming a more deeply integrated part of how people use their computers day to day.

To understand why this is notable, it helps to know what "agentic" AI means. The term describes systems that can plan and carry out tasks with a degree of autonomy, chaining together multiple steps to reach a goal instead of responding to one query at a time. Over the past year, several major players have released or previewed tools along these lines. OpenAI has demonstrated agents capable of operating a browser and completing tasks, Anthropic introduced a "computer use" capability that lets its Claude models interact with a screen, and Google has shown similar agent-style features. Microsoft, which develops Windows itself, has been steadily embedding its Copilot assistant into the operating system. Perplexity's arrival on Windows places it in direct proximity to these efforts.

The reference to a locally run AI system is worth reading carefully. Local operation typically implies that some processing happens on the user's own device rather than solely in the cloud, which can carry benefits for responsiveness and data handling. Perplexity has not, in the material available here, spelled out exactly how much runs on-device versus how much depends on its cloud models, so the precise balance appears to remain an open question. Many so-called local or on-device AI products still rely on remote servers for their most demanding work, and it would be reasonable to assume some hybrid arrangement is likely until the company details otherwise.

Personal Computer also fits into Perplexity's wider product strategy. The company has been expanding aggressively beyond search, most visibly with Comet, its AI-centric web browser that similarly aims to let users delegate tasks rather than click through them manually. Taken together, a browser and a desktop agent point to an ambition to sit closer to the operating system layer, where an assistant can observe and act across the applications a person already uses. That positioning puts Perplexity in competition not only with other AI startups but also with the platform owners themselves.

For users, the practical value of a tool like this will depend on how reliably it performs real tasks, how it handles permissions and sensitive data, and how it compares to the assistants built directly into Windows. Agentic software that controls a computer raises questions about accuracy, oversight, and security that the industry is still working through, and early versions of such tools have generally required human supervision. As the Windows release reaches a larger and more varied group of users, its everyday usefulness and limitations should become clearer. For now, the expansion confirms that Perplexity intends to compete for a place at the center of the personal computing experience rather than at its edges.