Coding agents
Codex
OpenAI
OpenAI's coding agent, used by more than 4 million people every week according to OpenAI (April 2026). Named a Leader by Gartner.
- Pricing
- Included in ChatGPT Free ($0), Go ($8), Plus ($20) and Pro (from $100/month), or billed per use with an API key (source: developers.openai.com/codex/pricing).
- License
- Codex CLI under Apache-2.0 (github.com/openai/codex); cloud service and ChatGPT app proprietary
- Latest version
- 0.165.0 (Codex CLI)
- Updated on
- Platforms
- CLI, IDE, Web, Desktop, Mobile
- Context window
- 1,050,000 tokens with GPT-6.1 Sol (recommended model); depends on the selected model
- MCP support
- Yes
- Operating systems
- macOS, Windows, Linux
- GitHub repository
- openai/codex · ★ 130,935 stars · Verified · See the repository ranking
Plans and pricing
| Plan | Price | Details |
|---|---|---|
| Free | $0/month | GPT-6 Luna in the desktop app (rolling out) |
| Go | $8/month | lightweight tasks |
| Plus | $20/month | web, CLI, IDE extension, iOS; GPT-6.1 Sol |
| Pro | $100, $200 or $500/month | Ultrafast mode on Pro $500 |
| Business | $20/user/month billed annually ($25 monthly) | 2+ users |
| API key | API pricing | CLI, SDK, IDE extension; no cloud features |
Source: https://developers.openai.com/codex/pricing · Verified
Alternatives
- Claude Code · Claude Code vs Codex
- GitHub Copilot · Codex vs GitHub Copilot
- OpenCode 2.0 · Codex vs OpenCode 2.0
- Aider · Aider vs Codex
Related articles and comparisons
- Gartner's first Magic Quadrant for coding agents
- COBOL, Fortran: OpenAI pitches AI for legacy migration
- Week of October 12: coding agents go team-mode
- Open-source coding agents on GitHub: OpenCode, Cline, OpenHands, Aider
- Choosing a coding agent by budget: free, $20 a month or enterprise
- VS Code 1.143, GPT-6 on Google Cloud, NVIDIA DSX POD: the October 22 roundup
- Agent Skills moves to the Linux Foundation: Anthropic hands its standard to the AAIF
- Kimi K3.1 Pro, Codex CLI 0.164, Copilot in Teams, Replit: the October 24 roundup
- Oracle opens its cloud to Google TPUs, Meta plans $95B of stock for AI: the October 28 roundup
- Claude Code, Codex or GitHub Copilot: which one?