Skip to content
aicoolies logo
Codex logo

Codex

Top Pick

OpenAI coding agent for app, editor, terminal, and cloud work

Codex is OpenAI's coding agent for software development across the Codex app, editor, terminal, and cloud tasks. It helps write, review, debug, refactor, and automate code, with ChatGPT plan access for managed surfaces and API-key usage for CLI, SDK, and IDE workflows. The open-source CLI and SDK support local repository work, while cloud features add GitHub review, Slack/Linear integrations, worktrees, skills, MCP, and automations.

Rate5.0 (1)
Website
ShareShare on XShare on LinkedInShare on Reddit
Is this your product? →

About Codex

Codex is OpenAI's coding agent for software development across the Codex app, web/cloud tasks, editor integrations, terminal CLI, and scriptable SDK workflows. It helps teams write code, understand unfamiliar repositories, review changes, debug failures, refactor systems, and automate routine development work. The current product framing is no longer a launch-era cloud-only model story: Codex is a connected agent surface tied to ChatGPT plan access, with API-key paths for local and automation workflows.

Codex is strongest when a team wants a managed OpenAI control plane for agentic coding. Developers can start work in the app, continue in an editor or terminal, delegate cloud tasks, run code review, configure skills and AGENTS.md guidance, connect MCP tools, and use automations for recurring engineering tasks. The CLI and SDK are open-source components, while Codex web, cloud tasks, IDE extension, and managed integrations remain OpenAI-hosted product surfaces.

Pricing and access depend on the surface. ChatGPT Free, Go, Plus, Pro, Business, Edu, and Enterprise paths include Codex access, with usage limits and features varying by plan. API-key usage is available for CLI, SDK, and IDE workflows and bills by token usage, but does not include cloud-only features such as GitHub code review, Slack integration, or hosted cloud tasks.

Pricing & Platform Specs

Pricing Summary

Codex access is included across ChatGPT subscription plans (Free, Plus at $20/mo, Pro 5x at $100/mo, Pro 20x at $200/mo, Team at $25-$30/user/mo, and Enterprise) for managed app, cloud tasks, and GitHub review workflows. API-key usage is available for the open-source CLI, IDE extension, and SDK, billing on pay-as-you-go token rates with prompt caching discounts.

full pricing breakdown →

Supported Platforms

Codex app, web/cloud tasks, CLI, IDE extension, SDK, GitHub review, Slack/Linear integrations, iOS, macOS, Windows, Linux.

Explore categories, tags & use cases

Alternatives

All Codex alternatives →
Amp logo

Amp

Top Pick

Agentic coding tool by Sourcegraph (formerly Cody)

Amp is a multi-model coding agent for terminal, web, macOS/iOS, and IDE-connected workflows. Vendor docs describe the same agent and threads across surfaces, with remote Orbs, local Runners, Dial modes (low / medium / high / ultra), shared threads, MCP, plugins, and BYOK / linked ChatGPT subscriptions. Pricing spans a free Hobby tier, optional Megawatt ($20/mo) and Gigawatt ($200/mo) Individual plans, no-extra-charge Teams workspaces, pay-as-you-go credits, and Enterprise.

freemium
OpenCode logo

OpenCode

Open-source AI coding agent for the terminal

Open-source terminal-based AI coding agent built in Go by the SST team, with a rich TUI (Bubble Tea) supporting 75+ model providers including OpenAI, Anthropic, Gemini, Bedrock, Groq, and OpenRouter. Features vim-like editing, persistent SQLite sessions, and LSP integration for 40+ languages. Fully free with no vendor lock-in, it has rapidly grown to 95k+ GitHub stars.

Open Source
Claude Code logo

Claude Code

Top Pick

Anthropic's agentic coding CLI

Anthropic's agentic CLI coding tool that delegates complex tasks to Claude directly from the terminal. Understands entire codebases via automatic context gathering, edits multiple files, runs shell commands, and manages Git workflows autonomously. Supports CLAUDE.md for persistent project instructions, integrates with VS Code and JetBrains, and uses Claude Opus/Sonnet with extended thinking for complex architectural decisions. Built for terminal-first developers.

freemium
Aider logo

Aider

AI pair programming in your terminal

Terminal-based AI pair programmer with deep git integration. Auto-commits changes with meaningful messages and creates repository maps for navigating large codebases. Works with Claude, GPT, DeepSeek, and local models. One of the most popular open-source AI coding tools, known for its reliability, broad model support, and seamless command-line workflow.

Open Source
Factory Droid logo

Factory Droid

Enterprise-grade AI coding agent system by Factory

System of specialized AI Droids — Code, Knowledge, Reliability, and Product — each optimized for specific development tasks. Ranked #1 on Terminal-Bench with 58.75% score. BYOK model with support for Anthropic and OpenAI models. Enterprise-focused approach that treats AI coding as a team of specialized agents rather than a single general-purpose assistant.

freemium
Grok logo

Grok Build

xAI's terminal coding agent with parallel subagents and worktree-aware automation

Grok Build is xAI’s terminal-first coding agent for planning, editing, testing, and reviewing code from a local CLI. It exposes subagent controls, worktree mode, headless JSON output, best-of-N parallel attempts, sandbox profiles, and cross-session Memory (/memory, /dream) for durable project conventions and facts. It fits developers comparing Claude Code, Codex, and Gemini CLI for local agentic workflows with deeper parallel execution.

paid

Side-by-Side Comparisons

Codex logo
Codex
vs
Grok logo
Grok Build

Codex vs Grok Build — OpenAI Multi-Surface Agent or xAI Terminal CLI?

Codex and Grok Build both help developers ship code with agents, but they start from different desks. Codex is OpenAI’s coding agent across app, editor, terminal, and cloud-style task surfaces, usually bought through ChatGPT plans or API-key CLI/SDK paths. Grok Build is xAI’s terminal-first coding agent with TUI/CLI controls, subagents, worktrees, and headless runs on SuperGrok / X Premium+ or xAI API metering. Use Codex when you want an OpenAI multi-surface coding loop. Use Grok Build when you want an xAI-native terminal agent. Existing aicoolies Scores: Codex overall 80, speed 72, privacy 68, developer experience 79 (Score date 2026-03-25); Grok Build overall 82, speed 84, privacy 72, developer experience 80 (Score date 2026-05-28). On those published totals Grok Build leads — still choose on product shape and ecosystem fit first; the scoreboard is secondary review evidence with those dates.

CodexGrok Build
Amp logo
Amp
vs
Codex logo
Codex

Amp vs Codex — Terminal Code Intelligence or OpenAI Multi-Surface Agent?

Amp and Codex both compete as AI coding agents, but they start from different desks. Amp is Sourcegraph’s agentic coding tool for large-repo edits with Orbs remote machines and Dial mode switching. Codex is OpenAI’s coding agent across app, editor, terminal, and cloud-style surfaces, usually via ChatGPT plans or API-key CLI/SDK paths. Use Amp when you want Sourcegraph-line code intelligence plus Orbs/Dial. Use Codex when you want OpenAI’s multi-surface loop. Existing aicoolies Scores (both Score-dated 2026-03-25): Amp overall 85, speed 87, privacy 83, developer experience 84; Codex overall 80, speed 72, privacy 68, developer experience 79. Choose on product shape and current surfaces first; the scoreboard is secondary review evidence with those dates.

AmpCodex
Codex logo
Codex
vs
Qwen Code logo
Qwen Code

Codex vs Qwen Code: OpenAI’s Managed Coding Workflow vs an Open Provider-Flexible Agent Stack

Codex and Qwen Code are Apache-2.0 coding-agent products with terminal, IDE, and desktop surfaces, repository tools, approval controls, sandbox options, MCP support, and unattended execution. The important difference is commercial and operational: Codex centers an OpenAI-managed workflow with ChatGPT identity and credit accounting, while Qwen Code centers an open, provider-flexible agent stack whose operator chooses the model endpoint, credentials, policies, and supporting infrastructure.

CodexQwen Code
Codex logo
Codex
vs
Aider logo
Aider

OpenAI Codex vs Aider: Managed Agentic Coding vs Open-Source Terminal Control

Codex and Aider both let you drive real code changes straight from the command line, but they sit at opposite ends of the build-versus-buy spectrum. Codex is OpenAI's managed, model-bundled coding agent that spans terminal, IDE, cloud, and mobile; Aider is a free, open-source pair programmer you point at whatever model you prefer. This guide breaks down where each wins for individual developers and small teams in 2026.

CodexAider
View 10 more comparisons

Community experience

Sources & verification

Sources checked
Content verified

Verification dates are editorial checks. Routine CMS saves and automatic updatedAt timestamps do not advance them.

FAQ

What is Codex?

Codex is OpenAI's coding agent for software development across the Codex app, editor, terminal, and cloud tasks. It helps write, review, debug, refactor, and automate code, with ChatGPT plan access for managed surfaces and API-key usage for CLI, SDK, and IDE workflows. The open-source CLI and SDK support local repository work, while cloud features add GitHub review, Slack/Linear integrations, worktrees, skills, MCP, and automations.

Is Codex free?

No — Codex is a paid tool. Codex access is included across ChatGPT subscription plans (Free, Plus at $20/mo, Pro 5x at $100/mo, Pro 20x at $200/mo, Team at $25-$30/user/mo, and Enterprise) for managed app, cloud tasks, and GitHub review workflows. API-key usage is available for the open-source CLI, IDE extension, and SDK, billing on pay-as-you-go token rates with prompt caching discounts.

Is Codex still maintained?

Yes — Codex is active. Its listing was last verified on August 29, 2026.

What are the best Codex alternatives?

The first editor-selected Codex alternatives are Amp, OpenCode, Claude Code, and more.

How does Codex score in our review?

The published editorial review lists Codex at 80/100 overall across speed, privacy, and developer experience. Check the review's evidence status and test metadata for its verification level.