# Octopus SI OS: an open-source, self-evolving agentic OS with a Rust kernel, released as a research preview

Canonical: https://theagenticweekly.com/news/octopus-si-os-self-evolving-agentic-os-research-preview · Evidence: Reported · First seen: 2026-10-26 12:27 UTC · Source published: 2026-10-09 08:28 UTC · Brief published: 2026-10-26 14:36 UTC · Updated: 2026-10-26 14:36 UTC · Author: Agentic Weekly

> Octopus SI OS is a new open-source (MIT) agentic operating system for macOS 14+ with a roughly 45,000-line Rust kernel, signed in through ChatGPT with Codex CLI as its first interface; its own README calls it a research preview and says that for ordinary coding tasks it adds nothing over Codex CLI.

## What changed

- A new MIT-licensed GitHub project describes itself as a self-evolving agentic OS: agents read and write files, drive a browser and the desktop, and call apps and accounts, by text or voice.
- The README says the kernel is about 45,000 lines of Rust and that other parts are ported onto it, starting with Codex: you sign in with ChatGPT and Codex CLI runs as one interface of the system.
- Requirements listed: macOS 14+, Node 24, stable Rust and a ChatGPT account. The app is built from source, ad-hoc signed and not notarized, so Gatekeeper may warn; a terminal client is also included.
- Under policy, the README says, an agent can create and revise goals, change triggers, add tools and organize workers, and these changes persist across tasks and runs.
- The authors label it a research preview and say that in their runs today's models do not take initiative on their own; whether the design produces measurable self-improvement is the open research question.

## In the source's words

> "This is a research preview."
> (Octopus SI OS README, https://github.com/miuuyy/Octopus-SI-OS)

> "for an ordinary coding task Octopus gives you nothing that Codex CLI does not already give you."
> (Octopus SI OS README, https://github.com/miuuyy/Octopus-SI-OS)

## What we have not verified

- We did not build or run Octopus SI OS; every capability here is as described in the project's README.
- We did not check the kernel line count, the security of its permission model, or its behaviour on hardware other than macOS 14+.
- The repository was created on 2026-10-09 (UTC); our watcher first flagged it on 2026-10-26 once it gained traction, so this is not same-day coverage.

## Timeline

- Source published: 2026-10-09 08:28 UTC
- First seen by our watcher: 2026-10-26 12:27 UTC (via GitHub new repos: topic mcp (discovery sweep); primary source is the project's GitHub README), 17.2 days after the source's timestamp
- Brief published: 2026-10-26 14:36 UTC

## Sources

- [Octopus SI OS README (GitHub)](https://github.com/miuuyy/Octopus-SI-OS) (primary source) (fetched 2026-10-26)

## Related

- [Codex CLI: verdict and setup guide](https://theagenticweekly.com/tools/codex-cli)
- [All news briefs](https://theagenticweekly.com/news)
- [This week's releases](https://theagenticweekly.com/this-week)
- [New AI models this week](https://theagenticweekly.com/models/this-week)

## How to cite

Agentic Weekly, "Octopus SI OS: an open-source, self-evolving agentic OS with a Rust kernel, released as a research preview", published 2026-10-26 14:36 UTC, https://theagenticweekly.com/news/octopus-si-os-self-evolving-agentic-os-research-preview