OpenAI Codex changelog: what's new each month
Every stable OpenAI Codex release summarised by month: the highlights, new features, improvements, fixes and anything you need to act on. 2 months covered; the current month updates daily.
October 2026
9 releases: 0.160.0 → 0.166.0
October brought major improvements to Codex's interface, model support, and permission handling. The month featured new default models, enhanced configuration options, and better control over agent execution.
Highlights
- GPT-6.1 Sol and Terra models are now available as defaults across bundled and cloud catalogs.
- Send follow-ups while Codex is responding to steer it immediately, with the ability to interrupt active Code Mode cells.
- New /config interface lets you search and adjust settings across categories with immediate application.
- Save reusable prompts and commands in numbered /presets slots with keyboard menu access.
- Built-in Google Cloud Vertex AI provider added alongside improved Amazon Bedrock multi-agent support.
New
- Guardian review capabilities to retrieve earlier user instructions and include context from agent handoffs.
- MCP server login from terminal sessions with /mcp login <name>.
- Microphone and speaker selection for voice conversations with locally saved preferences.
- Git worktree creation and listing tools for trusted local projects.
- Task pinning in the agent Command Center with shared Pinned group.
- /copy command and Ctrl+Insert for navigating and copying transcript blocks.
- Keyboard-driven transcript selection with word, line, and page motions and integrated search.
- codex queue --resume to resume unloaded threads after queueing a message.
Improved
- Terminal UI now preserves server provider, reasoning-summary, and verbosity settings across sessions.
- Unsent queued messages resume after reconnection without creating duplicates.
- Keyboard-accessible "Show more" action for browsing older tasks in the command center.
- Daybreak enabled by default for eligible accounts with clearer opt-in controls.
- Network proxy now checks permissions before DNS lookup and prevents credential aliases from bypassing inspection.
- Resuming saved threads restores permissions and network approvals while respecting explicit overrides.
- Markdown rendering now consistent across async questions, choices, answers, and transcript replies.
- Amazon Bedrock setup wizard enabled by default with improved AWS credential handling.
Fixed
- TUI crash when asynchronous questions contain multiple lines with line breaks and hyperlinks.
- Startup failures from feature setting differences between running background servers and CLI defaults.
- Windows sandbox PowerShell fallbacks and long-path permission repairs.
- Failed compaction no longer leaves partial summaries in conversation history.
- Fresh TUI sessions now honor the server's default approval reviewer when no explicit override is provided.
- Local image attachments are now preserved when restoring killed composer text.
September 2026
1 release: 0.159.3
September brought a small but focused update to OpenAI Codex, centered on account security improvements for local sessions.
Highlights
- Local sessions signed in with ChatGPT can now display optional reminders to complete account security setup.
Summaries are written automatically from the official release notes (full changelog ↗); check the original notes before relying on a detail. OpenAI Codex: pricing, features and alternatives · All changelogs