Building an OCR Evals App with Codex

Melvin Vivas · X post · 2026-09-07 · Open on X

Topics: Evaluation (Evals) & Testing, Portfolio Projects · Level: intermediate

Summary

A short update that he is building an evals app for OCR with Codex. It's a project idea with no further detail.

Key points

• Idea: an evaluation app that measures OCR quality.
• He is building it with the Codex coding agent.

Resources mentioned

• OpenAI Codex · tool · openai.com · paid
  OpenAI's coding agent. In the diagram it writes code, fixes review findings and drives the build loop. The creator also used it to make this video.
  Also in: An agent bot that installs and drives Codex on its own (Melvin Vivas on X · notes), Asking a Coder bot to install Codex (Melvin Vivas on X · notes), Sign in with ChatGPT: Setting Usage Limits for Each App (Melvin Vivas on X · notes), Codex Cloud Environments Must Be Saved & Published Before Use (Melvin Vivas on X · notes) and 240 more

Try this

• Build an evals app that compares OCR outputs from different models against ground truth.