OpenAI Codex — Cloud-Native Coding Agent Bundled With ChatGPT (GPT-5.5, Multi-Surface, Not Shut Down)

Not shut down. OpenAI Codex (original 2021 Codex model retired → relaunched May 2025 as cloud coding agent → 2026 expanded to desktop app + CLI + IDE extension + web + iOS + role plugins + Sites) is active as of 2026-08, WAU 5M+ (June 2026), 20M+ (Aug 2026). No acquisition/shutdown. Category ai-productivity-data; pipeline_stage none. Powered by GPT-5.5 (default), GPT-5.4/mini, GPT-5.3-Codex-Spark (Pro research preview). Not Claude Code (terminal-first), not Cursor (IDE-first), not GitHub Copilot (completion-first), not Devin (fully autonomous dev agent), not Gemini Code Assist (now Antigravity successor). 2026 trap: no standalone Codex subscription — rides ChatGPT plan quota, token-metered, 5-hour rolling window + weekly cap, Plus has no cloud tasks/PR review, Pro split into $100/5x and $200/20x.

1. One-line positioning

Codex = OpenAI’s autonomous coding agent that runs multi-step dev tasks (features, bugfixes, refactors, tests, PRs) in isolated cloud sandboxes preloaded with your GitHub/GitLab repo, reachable from ChatGPT web, desktop app (macOS/Win), CLI (Apache-2.4, Rust), VS Code/JetBrains/Xcode extensions, and iOS; April 2026 switched from per-message to token-based credit billing; June 2026 added Sites, Annotations, role plugins (IB/marketing/analyst/etc.), persistent-mode experiment (Aug 2026). Fits ai-productivity-data; pipeline_stage none (prompt → plan → sandbox-execute → diff → PR → human review).

2. Core features

Layer	Capability	Notes
Surfaces	ChatGPT web (/codex), desktop app macOS+Win, CLI (`npm i -g @openai/codex`), VS Code ext (works in Cursor/Windsurf), JetBrains (IntelliJ/PyCharm/WebStorm/Rider), Xcode 26.3, iOS via ChatGPT app	One quota across all surfaces
Agent loop	Isolated cloud VM sandbox, git worktree per task, multi-agent parallel, run tests/linters, file PRs, auto code review on GitHub	Plus = local messages only, no cloud tasks; cloud starts at Plus? no — cloud tasks start at Plus paid tier includes cloud? correction: Free/Go local only, Plus includes cloud tasks + PR review (verify: OpenAI docs say Plus = cloud tasks yes; some reviewers misstate)
Models	GPT-5.5 (default), GPT-5.4, GPT-5.4 mini (high-volume), GPT-5.3-Codex-Spark (Pro-only research preview)	Token rate varies by model
Skills / Automations	Reusable task skills, unattended issue triage, CI alert monitoring, GitHub Action for CI	Team/Enterprise
Extras (Jun 2026)	Sites (host interactive web apps from repo, Business+), Annotations (in-place edit slices of doc/sheet/slide), Role plugins (IB/Marketing/Analyst/Investor/Design/Ops, 90+ app integrations: Slack, Drive, SharePoint, Atlassian)	Non-dev surfaced in
Protocol	MCP client+server, AGENTS.md context, computer use (macOS first, Apr 2026), cross-session memory	Windows/Linux computer use rolling
SCM	GitHub + GitLab native, no Bitbucket
API mode	`codex` CLI/SDK with API key → per-token billing, no cloud PR review/Slack, no 5h window

3. Pricing (2026-08, USD, bundled with ChatGPT, token-credit meter)

ChatGPT tier	Price	Codex access
Free	$0	Limited local messages, no cloud tasks, no PR review, GPT-5.5 throttled
Go	$8/mo	Lightweight local CLI/web coding, no cloud delegation
Plus	$20/mo	Full Codex: web+CLI+IDE+iOS, cloud tasks, GitHub PR review, GPT-5.5, 5h window ~15-80 cloud tasks / 60-350 mini messages, weekly cap
Pro 5x	$100/mo	5× Plus usage, GPT-5.3-Codex-Spark, priority model access
Pro 20x	$200/mo	20× Plus, full ChatGPT Pro bundle, unlimited voice (tasks still draw quota)
Business	$25/user/mo (or $20 annual, min 2)	Team credit pool, larger VMs, SSO/MFA, no training on biz data, Sites/Annotations
Enterprise / Edu	Custom	SCIM, EKM, RBAC, audit logs, data residency (10 regions), 24/7 support
API key	Pay per token	GPT-5.5 ~$5/$25 per M in/out (Sol), Terra $2.5/$15, Luna $1/$6, cached input 10% rate; no cloud features

pricing_type = bundled-subscription-token-credit; starting_price = $0 (practical paid floor $8 Go or $20 Plus for cloud); free_tier = "yes; local messages only, no cloud sandbox tasks, no GitHub PR review, throttled GPT-5.5"; pricing_note = "codex-no-standalone-sub-bundled-in-chatgpt; apr-2026-per-message-to-token-credit-meter; 5h-rolling-window-plus-weekly-cap; plus-no-cloud-tasks-misinfo-correction-plus-has-cloud; pro-split-100-5x-200-20x-apr-2026; cli-free-but-model-billed-via-plan-or-api; fast-mode-2-2.5x-burn; avg-100-200-dev-mo-real-bill; no-bitbucket; mac-computer-use-first"

4. Access Type

access_type: cloud-agent-multisurface

access_display: 🌐 chatgpt.com/codex · 🖥️ macOS/Win desktop · ⌨️ CLI (Rust, Apache-2.0) · 🔌 VS Code/JetBrains/Xcode ext · 📱 iOS via ChatGPT · 🔑 API key

5. Reviews (2026)

Source	Signal
AI Agent Index	4.7/5 — “autonomous end-to-end, best surface breadth, quota confusion”
No Code MBA	“Not best at any one thing, widest coverage; ~30% fail rate on complex tasks, needs checkpoints”
CloudZero	“$20 is on-ramp not ceiling; real bill $100-200/dev/mo token-metered; API beats Plus under ~10-40 sessions/mo”
CodeAgentSwarm	“Pro $100 tier easy to miss; one quota across CLI+web+IDE surprises parallel users”
Reddit r/OpenAI	“30-150 req/5h window on Plus, crazy good until you hit it; buy credits or wait”

Praise: zero-setup if you have ChatGPT Plus, multi-surface (terminal to iOS), isolated sandbox PR flow, cross-session memory, role plugins make it usable by non-devs, Sites/Annotations push past pure coding, MCP + AGENTS.md.

Gripes: token-meter unpredictable, Plus quota burns on big refactors, no Bitbucket, computer use macOS-only, no self-host/open weights, Sites/Annotations/Business-only, Pro 5x/20x split confuses buyers, ~30% complex-task fail needs human checkpoints.

6. Best for / Not for

Best for	Not for
Existing ChatGPT Plus/Pro users wanting agentic coding without new sub	Devs who want self-hosted/local-first agent (Ollama+Codex CLI is API-only, no local weights)
Async background work: “fix failing test, run suite, open PR” while you sleep	Real-time inline completion addicts (Cursor better)
Teams with GitHub PR review + Slack triage needs (Business+)	Bitbucket shops
Mixed dev+non-dev workflows (analyst/IB/marketing plugins)	Windows/Linux users wanting computer-use
OpenAI-aligned stacks (Azure/Bedrock GPT-5.5 available)	Tight-budget solo who won’t watch token burn (API or Pro 5x sneaks up)
Long-running refactors in sandboxed worktrees	People who think $20/mo = unlimited (it’s 5h window + weekly cap)

7. Competitors

Tool	Lane	Starts
Claude Code	Terminal-first agent, Opus/Sonnet, long-repo reasoning	$20/mo (Pro) / $100 Max 5x / $200 Max 20x
Cursor	IDE-first (VS Code fork), multi-model, tab+agent	$20/mo Pro / $60-80/mo Business
GitHub Copilot	Inline completion + lightweight agent, MS ecosystem	$10/mo Individual / $19 Business
Windsurf	IDE agent, SWE-style	$15-30/mo
Devin (Cognition)	Fully autonomous dev agent, ultraplan cloud	Team $80+/seat
Codeium / Tabnine	Completion-first, cheaper	Free / $15-20
Gemini Code Assist / Antigravity	Google Cloud agent	$19 seat Std / Antigravity Ultra $200
Aider	OSS terminal agent, local models	Free (API cost only)