Codex Level Up uses a Next.js personal portfolio site to expand the scope of work you delegate to Codex step by step.
Each level adds the capability and deliverable associated with its title. Make the current stage reproducible before moving higher.
How to Use the Tutorials
If this is your first time through the section, start with the Codex Level Overview to understand why the levels exist, how to study them, and what the target end state looks like.
Each level moves from defining the deliverable through practice, verification, and troubleshooting:
- What you will complete - Confirm the deliverable and delegation boundary.
- Steps 1-3 - Set the boundary, practice, and verify completion.
- Check - Record evidence from diffs, commands, pages, or reviews.
- Troubleshooting - Correct scope expansion and vague completion criteria.
Tutorial Flow
| Level | Title | Practice | Typical deliverable |
|---|---|---|---|
| Level Overview | Overview | Understand the Level 0-10 map | Your current position and study route |
| Level 0 | Chat Advisor | Define requirements before opening the repository | Portfolio requirements note |
| Level 1 | Repository Reader | Read the repository and produce a change plan | Related-file map and change plan |
| Level 2 | Focused Editor | Make a bounded ProjectCard edit | Small reviewable diff |
| Level 3 | Verified Implementer | Implement multiple pages and finish verification | Page implementation and validation results |
| Level 4 | Context Engineer | Persist working rules in AGENTS.md | AGENTS.md and scoped instructions |
| Level 5 | GitHub Collaborator | Work from an issue through pull request review | Issue-linked branch and pull request |
| Level 6 | Harness Builder | Build a harness for permissions and validation | Harness with approvals, prohibitions, and checks |
| Level 7 | Tool Operator | Verify the UI with browser and connector tools | Validation record with evidence beyond code |
| Level 8 | Parallel Orchestrator | Implement independent tasks in parallel | Conflict-aware task split and integrated result |
| Level 9 | Workflow Operator | Automate recurring validation and triage | Recurring workflow with stop conditions |
| Level 10 | Agent Platform Architect | Design an operating model for multiple agents | Platform design with evaluation, audit, and improvement |
Getting Started
Read the Level Overview first, then start with Level 0 or begin at the stage that matches your current practice.
See the references for the external specifications and background sources used on this page.[1][2]
References
- OpenAI, Codex documentation
- OpenAI, OpenAI API documentation