Codex CLI 0.159.0 adds opt-in interruption by new input
Codex CLI 0.159.0 adds instant_interrupt, an opt-in feature that lets new input steer Codex during model responses or long-running code-mode calls.
SessionWatcher editorial · Published · Updated · Source announcement: 2026-09-29
Interrupt a response with new input
Codex CLI 0.159.0 adds the opt-in instant_interrupt feature. When enabled, new input can steer Codex while it is responding or during a long-running code-mode call.
This is an opt-in workflow change, not a default behavior. The release notes do not specify how to enable it, so check the CLI's current settings or documentation before relying on it.
Sources: Openai release notes: 2026-09-29
Other changes in 0.159.0
The release also adds native Mermaid rendering support for more flowchart edges, labels, and node groups. It changes the new-session welcome screen and headers, and lets users scroll the transcript while deciding whether to implement a plan.
The changelog lists 0.159.1 and 0.159.2 as separate releases on the same date, but their listed changes are catalog updates and a Windows console-window fix, not additions to the 0.159.0 interruption feature.
Sources: Openai release notes: 2026-09-29
AI assisted reporting, checked against the linked official sources. Source pages checked 2026-10-01. Editorial process and corrections.