Codex 0.156.0 Turns Voice On and Closes a Windows Sandbox Gap
The 23 September 2026 Codex release enables voice by default and blocks non-loopback inbound traffic in the Windows offline sandbox.
Direct answer
Codex 0.156.0, dated 23 September 2026, turns TUI voice conversations on by default and blocks non-loopback inbound traffic for the Windows offline sandbox.
Codex 0.156.0, recorded on 23 September 2026, changes two parts of the harness at once: how a person talks to the terminal session, and what the Windows sandbox will accept from the network.
Voice conversations are on by default. The release notes describe an F8 toggle, a /voice picker, and bundled audio runtimes for Linux and Windows. That is a step past 0.155.0 on 18 September, where /voice was experimental and had to be enabled through /experimental. The same 0.156.0 build adds a fullscreen terminal UI behind /tui, worktree sessions by default, and /usage analytics.
The sandbox change is narrower than the voice change
On the isolation side, 0.156.0 blocks non-loopback inbound traffic for the Windows offline sandbox. It also closes gaps involving privileged Linux and macOS sockets, and writes that went through read-only macOS file handles. Windows sandbox private desktops stay alive when a helper process exits, and the Windows sandbox service is included in the release artifacts. A managed network policy can apply to the Windows MXC sandbox.
A hotfix the same day, 0.156.1, only adds GPT-6 Sol and Luna to the model picker. The voice default and the inbound-traffic block are in 0.156.0.
FAQ
- How do you turn voice off?
- The notes say voice uses an F8 toggle and a /voice settings picker. Version 0.155.0 had kept /voice behind /experimental.
- What else did 0.156.0 change in the sandbox?
- It also closes gaps around privileged Linux and macOS sockets and writes through read-only macOS file handles, and it keeps Windows sandbox private desktops alive across helper exits.