Codex vs Devon
Codex and Devon are both popular tools in the AI Agents space. Codex uses a paid model starting at Usage-based, while Devon is open-source from Free. Devon offers a free tier, while Codex does not. Below we break down features, pricing, strengths, and weaknesses to help you decide which tool fits your workflow best.
Last updated: March 2026
Quick Verdict
Choose Codex if you want openai's cloud-based ai coding agent for autonomous software engineering.. Codex's biggest strengths include runs tasks in parallel without blocking your machine and sandboxed execution ensures safe code changes. It's also rated higher (4.2 vs 3.7). Choose Devon if you prefer open-source autonomous ai software engineer inspired by devin.. Key advantages include free open-source alternative to devin and community-driven development and improvements. It also has a free tier to get started.
OpenAI's cloud-based AI coding agent for autonomous software engineering.
| Codex | Devon | |
|---|---|---|
| Pricing | Usage-based | Free |
| Free Tier | No | Yes |
| Pricing Model | Paid | Open-source |
| Rating | ★ 4.2 | ★ 3.7 |
| Categories | Code Generation, AI Agents | AI Agents |
| Key Features | 6 features | 6 features |
| Feature | Codex | Devon |
|---|---|---|
| Cloud-based autonomous coding agent | ✓ | — |
| Parallel task execution in sandboxed environments | ✓ | — |
| Reads codebase, writes code, and runs tests | ✓ | — |
| Generates pull requests with verifiable changes | ✓ | — |
| Integrated into ChatGPT interface | ✓ | — |
| AGENTS.md configuration for project context | ✓ | — |
| Autonomous software engineering agent | — | ✓ |
| Natural language task specification | — | ✓ |
| Codebase navigation and code editing | — | ✓ |
| Shell command execution | — | ✓ |
| Multi-step task planning and execution | — | ✓ |
| Support for multiple LLM providers | — | ✓ |
Codex
Pros
- + Runs tasks in parallel without blocking your machine
- + Sandboxed execution ensures safe code changes
- + Tight integration with OpenAI's latest models
- + Provides citations and test results for verifiability
Cons
- − Requires OpenAI Pro or Team subscription
- − Limited control over execution compared to local agents
- − Still in early access with limited availability
Devon
Pros
- + Free open-source alternative to Devin
- + Community-driven development and improvements
- + Good for experimenting with autonomous agents
- + No expensive subscription required
Cons
- − Significantly less capable than commercial alternatives
- − Early-stage project with frequent breaking changes
- − Limited documentation and support
The Bottom Line
Choose Codex if: you want openai's cloud-based ai coding agent for autonomous software engineering.. It holds a higher user rating (4.2 vs 3.7). Keep in mind: requires openai pro or team subscription.
Choose Devon if: you prefer open-source autonomous ai software engineer inspired by devin.. It has a free tier to get started, which Codex lacks. It's completely free to use. Keep in mind: significantly less capable than commercial alternatives.
Both tools compete in the AI Agents space. The right choice depends on your specific needs, team size, and budget.
