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Codex CLI

OpenAI · CLI

Codex CLI 0.155.0

0.155.0-alpha.16→0.155.0·September 18, 2026 at 12:17 AM UTC

Stable release of 0.155.0: promotes the 0.155 line out of alpha, adds /personality, and drops experimental daemon/tunnel options ahead of GA.

Changelog

  • [new] Added the /personality slash command for adjusting agent personality during a session.
  • [changed] app-server daemon update now updates the standalone installation and restarts the managed daemon (may interrupt running work).
  • [changed] Shell completions (bash, fish, zsh) match the current CLI surface.
  • [removed] Removed the internal tcp-tunnel subcommand (HTTP/3 CONNECT proxy forwarding).
  • [removed] Removed the --no-daemon flag from the main CLI and from agents, resume, and fork.
  • [removed] Removed the /daemon slash command.
  • [removed] Dropped --no-browser from mcp login (browser-based OAuth flow is the supported path).
  • [removed] Removed several daemon maintenance flags (--from-cli / --yes on daemon update; --restore-release and --check-package-ownership on pid-update-loop).
  • [removed] Removed the o1 model identifier from the built-in model list.

Under the hood

  • MCP tool handling is structured more clearly, including richer MCP tool-call begin/end event payloads and shared multi-agent tool helpers.
  • Guardian review-session setup is reworked around dedicated session factory and thread helpers.
  • TUI gains token-usage chart building blocks; legacy analytics dashboard code paths are cleared out of this build.
  • Config and requirements models are tightened (including permission profiles, experimental features, and thread/turn start payloads).
  • Workspace no longer ships the mermaid or tcp-tunnel crates; related TLS/QUIC dependency pins are adjusted (rustls, aws-lc-rs, and related crates).
  • Channel metadata is set to stable (0.155.0 / rust-v0.155.0).

Upgrade notes

  • Scripts or aliases that used codex tcp-tunnel, --no-daemon, /daemon, or mcp login --no-browser need updating.
  • If you pinned or selected o1 explicitly, choose a currently supported model instead.
  • Daemon update workflows should rely on the simplified app-server daemon update flow rather than the removed package-pin / restore flags.
  • Regenerate or refresh shell completions so removed subcommands and flags no longer appear.

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Older release← 0.155.0-alpha.16Newer release→ 0.156.0-alpha.1
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