Codex CLI 0.160.1 ships: Windows remote MCP environment fix backported

#What happened

• OpenAI released Codex CLI 0.160.1 (stable) on October 5, 2026 — the day after the rust 0.162.0-alpha.15 pre-release, while 0.160.0 (Oct 1) remains the prior stable.
• The single bug fix: preserves SYSTEMROOT, TEMP, and TMP when launching remote stdio MCP servers with explicitly configured remote environment variables, letting Unix hosts retain the Windows executor's startup environment.
• Changelog cites PR #51121: "Backport Windows remote MCP environment preservation to 0.160."

#Why it matters

• A narrow, Windows-focused fix — mostly relevant to developers running remote MCP servers from Windows executors; most users can update routinely with no behavior change expected.

SOURCES:

• https://github.com/openai/codex/releases

Verified October 5, 2026.