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Codex Changelog ​

A chronological record of major updates to OpenAI Codex — including new models, IDE features, CLI tools, and cloud improvements. Stay up to date with the latest changes that impact your development workflow.

2025-09-15 — Introducing GPT-5-Codex ​

New Model: GPT-5-Codex ​

  • GPT-5-Codex is a specialized version of GPT-5 optimized for agentic coding workflows
  • Available in the IDE extension and CLI when you sign in with your ChatGPT account
  • Powers Codex cloud agent and GitHub Code Review integration
  • Read the announcement blog for performance comparisons between GPT-5 and GPT-5-Codex on software engineering benchmarks

Image Outputs ​

  • Codex web can now display UI screenshots when working on front-end tasks
  • Lets you iterate on designs without checking out branches locally

New in Codex CLI ​

  • codex resume: Resume sessions exactly where you left off
  • Context compaction: Sessions are auto-summarized when nearing the context window limit
  • See release notes for details

2025-08-27 — Late August Update ​

IDE Extension ​

  • Codex now runs inside IDEs (VS Code, Cursor, Windsurf)
  • Provides an interactive UI for fast iteration

One-Click Sign-In ​

  • Authenticate via ChatGPT Enterprise without needing API keys

Move Work Between Local ↔ Cloud ​

  • Hand off tasks from IDE → Codex web
  • Apply changes locally after remote execution

Code Reviews ​

Goes beyond static analysis:

  • Checks PRs against intent
  • Reasons across codebase and dependencies
  • Executes code to validate behavior

2025-08-21 — Mid August Update ​

Image Inputs ​

  • Attach screenshots/diagrams to prompts in Codex web
  • Useful for frontend tweaks or whiteboard-to-code workflows

Container Caching ​

  • Cached containers = 90% faster task start (median dropped from 48s → 5s)
  • Optional maintenance scripts keep environments up-to-date

Automatic Environment Setup ​

  • Default setup for common package managers (yarn, npm, pnpm, go mod, gradle, pip, poetry, uv, cargo)
  • Reduced environment setup failures by 40%

2025-06-13 — Best of N ​

Multi-Solution Generation ​

  • Codex can generate multiple candidate responses for one task
  • Lets you explore and select the best solution

Fixes & Improvements ​

  • Keyboard shortcuts panel (⌘-/ on macOS, Ctrl+/ elsewhere)
  • Better task setup reliability
  • Improved error handling for network restrictions
  • Setup script duration increased to 20 minutes (Pro, Team, Business tiers)
  • Polished Git diffs with option-click to expand/collapse all

2025-06-03 — June Update ​

Agent Internet Access ​

  • Enable Codex to use the internet during execution: install deps, run tests needing external resources, etc.
  • Off by default
  • Available to Plus, Pro, Team users with granular controls
  • Enterprise rollout planned

Update Existing PRs ​

  • Codex can now update open pull requests directly

Voice Dictation ​

  • Dictate tasks via microphone input

Fixes & Improvements ​

  • Better binary file handling
  • Improved GitHub connection flow
  • Session limits raised (diffs up to 5 MB, setup scripts up to 10 minutes)
  • Live Activities re-enabled on iOS

2025-05-22 — Reworked Environment Page ​

  • Simplified, faster environment setup experience
  • Retry button for failed tasks
  • Support for Unicode branch names
  • GitHub disconnects reduced by 90%
  • PR creation latency reduced by 35%
  • Tool call latency reduced by 50%
  • Task completion latency reduced by 20%

2025-05-19 — Codex in ChatGPT iOS App ​

  • Start tasks, view diffs, and push PRs directly from iOS
  • Enables Codex workflows even when away from your desk

This changelog is updated regularly. For full technical details, see the Codex release notes.