OpenAI Codex CLI rust-v0.155.1

OpenAI Codex CLI rust-v0.155.1 was released on September 18, 2026.

Summary

OpenAI Codex CLI rust-v0.155.1 fixes a critical issue where new local TUI sessions were incorrectly enabling reasoning summaries, causing rejections from some providers. This update restores the proper default while preserving your explicit settings. Check out what else improv...

Release Context

This was the 93rd OpenAI Codex CLI release of 2026 tracked by Havoptic.
It shipped 1 day after OpenAI Codex CLI rust-v0.155.0 (September 17, 2026).

Shipped around the same time

Within 3 days of this release, other AI coding tools also shipped:

GitHub Copilot CLI v1.0.87 (September 21, 2026)
Kiro CLI v2.23.0 (September 21, 2026)
Factory Droid v0.224.0 (September 21, 2026)
Devin 2026.09.21 (September 21, 2026)
Bolt 2026.09.21 (September 21, 2026)

Compare OpenAI Codex CLI

Release Notes

Bug Fixes - New local TUI sessions now leave reasoning summaries disabled by default, fixing request rejection by providers that do not support them. Explicit reasoning-summary settings remain respected. (46467) Changelog Full Changelog: https://github.com/openai/codex/compare/rust-v0.155.0...rust-v0.155.1 - 46467 Restore none as the TUI reasoning summary default (@celia-oai)

View original release

Other Recent OpenAI Codex CLI Releases

rust-v0.169.0 (November 13, 2026)
rust-v0.168.0 (November 13, 2026)
rust-v0.167.2 (November 11, 2026)
rust-v0.167.1 (November 10, 2026)
rust-v0.167.0 (November 6, 2026)

Upgrading from rust-v0.155.1? See all 23 releases since.

All OpenAI Codex CLI releases · All AI coding tool releases on Havoptic