Cline vs OpenAI Codex
Which should you use? A side-by-side look at what each one does, who it suits, what it costs, how hard it is to set up, and where each falls short.
AI tool · Open source
An open-source autonomous coding agent for VS Code that plans, edits files and runs commands with your approval.
AI tool · Paid
OpenAI's coding agent that works in the cloud, a CLI and IDE extensions to write features, fix bugs and open pull requests.
Our verdict
Cline is a free, open-source agent that lives inside VS Code and works with any AI model you bring, with you approving each step it takes on your own machine. OpenAI Codex is a paid cloud agent that takes on whole tasks, runs them in parallel, and opens pull requests on GitHub for you to review. Choose Cline if you want hands-on control and your own model; choose Codex if you want to hand off well-defined tasks and review the results.
Pick Cline if you want an AI agent inside VS Code that asks before each action and lets you use the model provider you choose.
Pick OpenAI Codex if you want to delegate well-scoped coding tasks to a cloud agent that returns pull requests for review.
| Key difference | Cline | OpenAI Codex |
|---|---|---|
| Price | Open source; you pay your own model API token costs | Paid product; pricing details not covered here |
| Where it runs | Inside VS Code and JetBrains editors | Cloud tasks, CLI, and VS Code, macOS, Linux |
| Control | Approve each action; plan and act modes | Hands off tasks to the cloud, runs several in parallel |
| Model choice | Works with any model provider | Built around OpenAI's own agent |
| Best at | Transparent, step-by-step agent work in your editor | Delegating tasks and reviewing GitHub pull requests |
Written with AI from both products' catalogue entries · updated 2026-10-29
Who each one is for
Choose Cline if you need…
- Bring-your-own-model agent in VS Code
- Transparent step-by-step agent work
Choose OpenAI Codex if you need…
- Delegating tasks to a cloud agent
- ChatGPT subscribers who code
Side-by-side
| Cline | OpenAI Codex | |
|---|---|---|
| Type | Coding · Coding agents | Coding · Coding agents |
| Price | Open source | Paid |
| Platforms | VS Code, JetBrains | Web, CLI, VS Code, macOS, Linux |
| Works with | VS Code, JetBrains | GitHub, VS Code |
| Hands-on tested by us | Not yet | Not yet |
| Last checked | 2026-10-29 | 2026-10-29 |
What each one is
Cline
An open-source autonomous coding agent for VS Code that plans, edits files and runs commands with your approval. Very flexible and transparent. Token costs on your own API key can climb fast.
OpenAI Codex
OpenAI's coding agent that works in the cloud, a CLI and IDE extensions to write features, fix bugs and open pull requests. Strong for well-scoped tasks. Review every pull request it opens; large refactors still need guidance.
Best for
Cline
- Bring-your-own-model agent in VS Code
- Transparent step-by-step agent work
OpenAI Codex
- Delegating tasks to a cloud agent
- ChatGPT subscribers who code
Strengths
Cline
- Plan and act modes
- Approval for each action
- Any model provider
- MCP tools
OpenAI Codex
- Cloud tasks with parallel runs
- Open-source CLI
- IDE extension
- GitHub pull requests and reviews
Frequently asked questions
Should I use Cline or OpenAI Codex?
Cline is a free, open-source agent that lives inside VS Code and works with any AI model you bring, with you approving each step it takes on your own machine. OpenAI Codex is a paid cloud agent that takes on whole tasks, runs them in parallel, and opens pull requests on GitHub for you to review. Choose Cline if you want hands-on control and your own model; choose Codex if you want to hand off well-defined tasks and review the results. Pick Cline if you want an AI agent inside VS Code that asks before each action and lets you use the model provider you choose. Pick OpenAI Codex if you want to delegate well-scoped coding tasks to a cloud agent that returns pull requests for review.
What is the difference between Cline and OpenAI Codex?
Cline: An open-source autonomous coding agent for VS Code that plans, edits files and runs commands with your approval. OpenAI Codex: OpenAI's coding agent that works in the cloud, a CLI and IDE extensions to write features, fix bugs and open pull requests. Cline suits bring-your-own-model agent in vs code, while OpenAI Codex suits delegating tasks to a cloud agent.
Are Cline and OpenAI Codex free?
Cline: Open source. OpenAI Codex: Paid.
What are other alternatives to Cline and OpenAI Codex?
Other options people compare them with include Claude Code, Gemini CLI, Amp, Aider, Devin.
Keep comparing
Built from our catalogue entries for both products: open-source details come from each project's README (AI-assisted, refreshed weekly) and GitHub data; AI-tool details are editorial. Spotted something wrong? Let us know from either product's page.