OpenAI Codex
OpenAI's coding agent in the cloud, CLI and editor
by OpenAISupportedFreshly checkedChecked 29 Sept 2026
Codex is OpenAI's coding agent. It runs tasks in a cloud environment or locally through the CLI and editor extensions: building features, fixing bugs, reviewing code and proposing pull requests. Included with paid ChatGPT plans.
Best for
- Running tasks in parallel in the cloud
- Automating code reviews
Not ideal for
- Beginners without programming knowledge
Limitations
- Usage capped per time window depending on the ChatGPT plan
DNA
- Level
- Advanced
- Platforms
- Web, Terminal (CLI), VS Code, iOS
- Via ChatGPT FreeFree≈ €0Supp.
Limited trial access
Sources and evidence
- Status
- Supported
- Confidence
- 58/100
- Method
- web research (secondary sources)
- Observed
- 29 Sept 2026
- Confirmed on the official source
- Not yet confirmed verbatim on the official source
Evidence
Web search summary: "OpenAI Codex is bundled into ChatGPT plans. The Free tier costs $0 with limited trial access, Plus is $20/month with 10–60 cloud tasks per 5-hour window, Pro 5x is $100/month… Pro 20x is $200/month… The new Pro 5x tier at $100/month (launched April 2026)"
Sources
- [Official site] OpenAI Codex pricing (developers.openai.com)
- [Secondary source] eesel.ai (eesel.ai)
- [Secondary source] cloudzero.com (cloudzero.com)
- Via ChatGPT PlusUS$20/mo≈ €17.61Supp.
10–60 cloud tasks per 5-hour window
Sources and evidence
- Status
- Supported
- Confidence
- 58/100
- Method
- web research (secondary sources)
- Observed
- 29 Sept 2026
- Confirmed on the official source
- Not yet confirmed verbatim on the official source
Evidence
Web search summary: "OpenAI Codex is bundled into ChatGPT plans. The Free tier costs $0 with limited trial access, Plus is $20/month with 10–60 cloud tasks per 5-hour window, Pro 5x is $100/month… Pro 20x is $200/month… The new Pro 5x tier at $100/month (launched April 2026)"
Sources
- [Official site] OpenAI Codex pricing (developers.openai.com)
- [Secondary source] eesel.ai (eesel.ai)
- [Secondary source] cloudzero.com (cloudzero.com)
- Via ChatGPT Pro 5xUS$100/mo≈ €88.07Supp.
5× Plus usage
Sources and evidence
- Status
- Supported
- Confidence
- 58/100
- Method
- web research (secondary sources)
- Observed
- 29 Sept 2026
- Confirmed on the official source
- Not yet confirmed verbatim on the official source
Evidence
Web search summary: "OpenAI Codex is bundled into ChatGPT plans. The Free tier costs $0 with limited trial access, Plus is $20/month with 10–60 cloud tasks per 5-hour window, Pro 5x is $100/month… Pro 20x is $200/month… The new Pro 5x tier at $100/month (launched April 2026)"
Sources
- [Official site] OpenAI Codex pricing (developers.openai.com)
- [Secondary source] eesel.ai (eesel.ai)
- [Secondary source] cloudzero.com (cloudzero.com)
- Via ChatGPT Pro 20xUS$200/mo≈ €176.13Supp.
20× Plus usage
Sources and evidence
- Status
- Supported
- Confidence
- 58/100
- Method
- web research (secondary sources)
- Observed
- 29 Sept 2026
- Confirmed on the official source
- Not yet confirmed verbatim on the official source
Evidence
Web search summary: "OpenAI Codex is bundled into ChatGPT plans. The Free tier costs $0 with limited trial access, Plus is $20/month with 10–60 cloud tasks per 5-hour window, Pro 5x is $100/month… Pro 20x is $200/month… The new Pro 5x tier at $100/month (launched April 2026)"
Sources
- [Official site] OpenAI Codex pricing (developers.openai.com)
- [Secondary source] eesel.ai (eesel.ai)
- [Secondary source] cloudzero.com (cloudzero.com)
Facts
- Free plan
- yes Supp.
Sources and evidence
- Status
- Supported
- Confidence
- 58/100
- Method
- web research (secondary sources)
- Observed
- 29 Sept 2026
- Confirmed on the official source
- Not yet confirmed verbatim on the official source
Evidence
Web search summary: "OpenAI Codex is bundled into ChatGPT plans. The Free tier costs $0 with limited trial access, Plus is $20/month with 10–60 cloud tasks per 5-hour window, Pro 5x is $100/month… Pro 20x is $200/month… The new Pro 5x tier at $100/month (launched April 2026)"
Limited trial access on the ChatGPT Free tier.
Sources
- [Official site] OpenAI Codex pricing (developers.openai.com)
- [Secondary source] eesel.ai (eesel.ai)
- [Secondary source] cloudzero.com (cloudzero.com)
- Free trial
- unknown
- Commercial use on free plan
- unknown
- Watermark on free plan
- unknown
- API
- unknown
- Open source
- unknown
- Self-hostable
- unknown
- Platforms
- Web, Terminal (CLI), VS Code, iOS Supp.
Sources and evidence
- Status
- Supported
- Confidence
- 58/100
- Method
- web research (secondary sources)
- Observed
- 29 Sept 2026
- Confirmed on the official source
- Not yet confirmed verbatim on the official source
Evidence
Web search summary: "These plans include access across web, CLI, IDE extensions, and iOS platforms"
Sources
- [Official site] OpenAI Codex pricing (developers.openai.com)
- [Secondary source] eesel.ai (eesel.ai)
- [Secondary source] cloudzero.com (cloudzero.com)
- Runs on model
- unknown
Timeline
1 Apr 2026 · New plan
New $100 ChatGPT Pro tier with 5× more Codex usage
Source: www.eesel.ai
Alternatives
All alternatives to OpenAI Codex →- Claude CodeAnthropic's coding agent for terminal and editorUS$20/moSupp.Freshly checked
- CursorAI code editor with agents that write code on their ownUS$20/moFree plan availableSupp.Freshly checked
- GitHub CopilotAI coding assistant in your editor and on GitHubUS$10/moFree plan availableSupp.Freshly checked