Codex vs Replit Agent: Side-by-Side Comparison 2026
Codex vs Replit Agent comparison 2026. Side-by-side features, pricing & capabilities.
| Feature | Codex | Replit Agent |
|---|---|---|
| Category | Agent | Builder |
| Starting Price | Free | Free |
| Model Family | GPT / Codex | Proprietary |
| Context Window | 400K | Not disclosed |
| Code Completion | ✓ | ✓ |
| Chat | ✓ | ✓ |
| Inline Editing | ✓ | ✓ |
| Agentic Mode | ✓ | ✓ |
| Multi-File Editing | ✓ | ✓ |
| Terminal Commands | ✓ | ✓ |
| Browser Use | ✗ | ✗ |
| Test Generation | ✓ | ✓ |
| Debugging | ✓ | ✓ |
| Refactoring | ✓ | ✓ |
| Code Review | ✓ | ✗ |
| PR Review | ✓ | ✗ |
| Documentation | ✓ | ✓ |
| Image to Code | ✗ | ✗ |
| Voice Input | ✗ | ✗ |
| App Generation | ✓ | ✓ |
| Deployment | ✗ | ✗ |
| Git Integration | ✓ | ✓ |
| Supported IDEs | Codex App, VS Code, CLI | Replit IDE (browser), SSH sync |
| Open Source | Yes (CLI) | No |
Pricing verified 2026-02-05. Codex pricing | Replit Agent pricing
Overview
Codex is ai agent from OpenAI. Replit Agent is app builder from Replit. Both tools are actively maintained as of 2026.
Codex: What You Get
Codex — AI Coding Agent from OpenAI. App / CLI / IDE.
- Code completions
- AI chat
- Agentic mode
- Multi-file editing
- Terminal commands
- Test generation
- Debugging
- Code review
- Git integration
- App generation
Pricing: Free / $8/mo. 6 plans available.
Models: GPT-5.3-Codex, Codex-mini-latest
Replit Agent: What You Get
Cloud-based IDE and app platform with an AI assistant that can build, debug, and deploy applications directly in the browser.
- Browser-based IDE
- AI assistant
- Multiplayer coding
- One-click deploy
- Database integration
- Package management
Pricing: Free / $20/mo. 3 plans available.
Models: Replit Agent 3 (proprietary)
Key Differences
- Category: Codex is ai agent, Replit Agent is app builder.
- Model family: Codex uses GPT / Codex; Replit Agent uses Proprietary.
Which Should You Choose?
Choose Codex if you want Codex handles multi-step tasks independently. Choose Replit Agent if you want Best platform for learning to code with AI. Both tools are strong options — the right choice depends on your workflow and priorities.
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