Codex Finds a Bug in a LiteLLM Feature

Melvin Vivas · X post · 2026-07-29 · Open on X

Topics: AI Dev Tools & Productivity, LLMOps, Deployment & Monitoring · Level: intermediate

Summary

The creator reports that Codex found a bug in a LiteLLM feature he needed. This is the first post in the thread; the follow-up says Codex then fixed it.

Key points

• Coding agents like Codex can find bugs in third-party open-source tools.
• The bug was in a LiteLLM feature (pricing markups, per the follow-up post).

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
• LiteLLM · tool · github.com · free · recommended by both Bashiri Smith & Melvin Vivas
  An open-source LLM gateway/proxy that gives one API for many model providers, with cost tracking and pricing features.
  Also in: 7 Habits to Become an AI Engineer: Books, Tooling, Research & Shipping (Bashiri Smith on Facebook · notes), Using Codex to Fix a LiteLLM Pricing-Markup Bug in Docker (Melvin Vivas on X · notes)