perplexityai/space is a sandbox platform Perplexity has published for the isolated execution of agents and user code. It is implemented in Rust and presents a structure that lets you swap out the runtime. FACTS lists no latest release, and the README summary confirms the commit as 886a35d3. So this is not about changes in any particular version, but a look at the design described by the repository's implementation and documentation.
The basic flow is to create a sandbox from a template, then deliver execution results through a command session. The execution base is the Firecracker microVM, which separates the code from other execution environments using a virtual machine. Lifecycle changes are handled as asynchronous operations. The structure is to poll the operation ID, which serves as the task identifier, to check progress. The attach token used when connecting to a session and a separate data plane connection are also documented. The code contains 27 crates under crates/libs and gRPC definitions in the proto directory. The E2B-compatible wrapper makes it possible to use the existing Python SDK, and the license is Apache-2.0.
The README gives no performance figures, so execution speed or throughput is hard to judge from this material alone. There is no latest release either, so per-release change histories cannot be confirmed. This repository can therefore be treated as reference material for examining the components and operational flow of isolated execution, but separate validation is needed if performance matters to your adoption decision.