Unrolling the Codex agent loop
What changed
A technical deep dive into the Codex agent loop, explaining how Codex CLI orchestrates models, tools, prompts, and performance using the Responses API.
Why it matters
A concrete addition to Practical AI: Tools, Models & Frameworks: it changes what's available to builders today rather than being general commentary.
How it compares
Related prior coverage to compare against:
- Introducing Codex
- Introducing GPT-5.3-Codex
- Speeding up agentic workflows with WebSockets in the Responses API
Sources
- Unrolling the Codex agent loop (openai-blog)primary