Codex 0.164.0 adds /presets, inline /model and /permissions arguments and enterprise MCP sign-in

Codex CLI 0.164.0, released October 22, 2026, per its release notes:

• Presets: reusable prompts and slash commands can be saved in ten numbered /presets slots, with a keyboard menu for quick access.
• Inline arguments: /model and /permissions accept the model, reasoning effort, speed and permission profile directly.
• Image previews: images viewed or generated appear in the fullscreen transcript on terminals that support Kitty or Sixel graphics.
• Enterprise MCP: connections can authenticate with eligible Codex account grants or a dedicated sign-in, including OAuth clients that require secrets.
• Credential masking: credentials are masked during supported remote Bash commands and Zsh snapshot sessions, including credentials from custom providers.
• Amazon Bedrock: the setup wizard is now on by default, and API key entry sits with the other AWS sign-in methods when credentials are detected.

Fixes include failed compaction no longer leaving partial summaries in the conversation history, resumed sessions restoring their saved thread settings, proxy authentication on Windows (Negotiate or NTLM), and sandbox hardening for case-variant metadata paths on macOS and replaceable symlinks used to locate executables. The release also reduces disk usage by pruning unused installations and bounding daemon logs.