Alpha· Notable · Confirmed
Thread history modes and managed session defaults arrive
Codex added per-thread history modes, managed new-thread model settings, and a standalone code-mode process host.
This prerelease gives applications more control over how thread history behaves and how new sessions inherit managed model settings, while code mode gains a separately supervised process host.
Alpha release context: 1 official tag was published that UTC day (rust-v0.143.0-alpha.26). The full comparison contains 35 commits and 267 changed files.
Evidence
App-server threads now expose a history mode.Why it matters: Clients can represent thread-history behavior explicitly instead of treating every thread as having the same history policy.
Direct evidence · Confirmed
Supporting sources
- feat(app-server): add history_mode to thread (#29927) commit · Official
- rust-v0.143.0-alpha.25 to rust-v0.143.0-alpha.26 comparison tag-compare · Official
Conflicting sources
No conflicting sources recorded.
Managed model settings can be applied when a new thread is created.Why it matters: Administrators can shape new-session model defaults through managed configuration rather than relying only on each user's local choice.
Direct evidence · Confirmed
Supporting sources
- [codex] Add managed new-thread model settings (#29683) commit · Official
- rust-v0.143.0-alpha.25 to rust-v0.143.0-alpha.26 comparison tag-compare · Official
Conflicting sources
No conflicting sources recorded.
Code mode gains a standalone process host.Why it matters: Code-mode execution can run through a dedicated host process with a clearer lifecycle boundary for supervision and recovery.
Direct evidence · Confirmed
Supporting sources
- [codex] implement standalone code-mode process host (#30111) commit · Official
- rust-v0.143.0-alpha.25 to rust-v0.143.0-alpha.26 comparison tag-compare · Official
Conflicting sources
No conflicting sources recorded.
Availability
Availability note: these sources establish repository and CLI release activity. They do not, by themselves, prove that the same changes were live in Codex Desktop.
Availability by surface
| Surface | Status | Claim-level evidence |
|---|---|---|
| CLI | Prerelease · Documented · General |
|
| Desktop | Unknown · Unknown · Unknown |
|
| IDE | Unknown | No central-claim assertion recorded. |
| Cloud | Unknown | No central-claim assertion recorded. |
| Mobile | Unknown | No central-claim assertion recorded. |