Codex CLI's Big Refresh Just Landed: First Session, Parallel Agents, and Why /fork Isn't a Worktree

Attributed compile (not original research)Primary source: ChatGPT & Codex changelog by OpenAI, Codex CLI releases 0.156.0 (2026-09-22) through 0.160.0 (2026-10-01), plus OpenAI's Codex CLI command ref