Perplexity Keeps Your Private Files on the Mac, Not the Cloud

Perplexity introduced a feature on September 1 called Hybrid Compute, and the idea behind it is refreshingly specific. When its Mac app runs one of the multi-step agent tasks it calls Computer, it now splits the work in two. The heavy reasoning, web search and planning stay in the cloud, where the large models live. The parts that touch your private files run on a smaller model on the Mac itself, and never leave the machine.

Chief executive Aravind Srinivas framed it around the documents people are most nervous about handing to a server. The local model handles agent steps involving sensitive files such as bloodwork, tax returns and litigation. The app tries to detect which files are private and route them to the on-device model automatically, so the user is not left deciding what counts as sensitive on a case-by-case basis.

What runs where

Hybrid Compute ships with three local models: Google's Gemma 4 E4B, Alibaba's Qwen3.6 35B-A3B, and a Perplexity model tuned specifically for Computer. Running a capable model on your own hardware has a cost, and here it is memory. The feature needs an Apple silicon Mac with macOS 15 or later and at least 24GB of unified memory, which rules out the cheaper machines. It is available to Pro, Max and Enterprise subscribers, according to Engadget's writeup.

A sensible answer to a real problem

The privacy pitch around AI assistants has mostly been a promise: trust us, we will handle your data responsibly. Hybrid Compute is a different kind of answer, because the sensitive data physically does not go anywhere. That is easier to verify and harder to walk back. It also sidesteps the awkward moment that has surfaced elsewhere, such as when ChatGPT gained the ability to read and send iMessages on a Mac and users had to weigh convenience against exposure.

Whether the local models are good enough to carry their half of the work is the open question, and it will vary by task. But the architecture is the point. Splitting a job so that the private parts stay home is a design other assistants are likely to copy, if only because it is easier to explain to a worried user than any privacy policy.