Reverse engineering Codex CLI to get GPT-5-Codex-Mini to draw me a pelican
14 days ago
- #Rust
- #reverse-engineering
- #OpenAI
- OpenAI released GPT-5-Codex-Mini, a compact version of GPT-5-Codex, accessible via Codex CLI and VS Code extension.
- The author reverse-engineered the Codex CLI tool, written in Rust, to directly prompt the new model.
- A new sub-command 'codex prompt' was added to interact with the model directly, bypassing some default behaviors.
- The tool was tested by generating SVG images of a pelican riding a bicycle using different model versions.
- A '--debug' option was implemented to inspect API requests and responses, revealing OpenAI's private API endpoint.