Unrolling the Codex agent loop
OpenAI's Codex CLI agent loop is live—here's how it orchestrates models and tools at scale.
Why it matters
OpenAI is shipping agent infrastructure (Codex CLI) that lets developers compose models, tools, and prompts into production workflows. This is a foundational product drop that moves agents from research/demo into developer tooling.
The key facts
8 to knowCodex CLI orchestrates models, tools, prompts, and performance
Uses Responses API for agent loop management
Technical deep-dive format suggests production-ready tooling
Published Jan 23 2026 — recent/current release
Codex agent loop orchestrates models, tools, prompts, and performance
Responses API enables structured agent coordination
Codex CLI product ship (Jan 2026)
Technical focus on agent reliability and tool integration
Go to the source
OpenAI Blogopenai.com
Publisher excerpt: A technical deep dive into the Codex agent loop, explaining how Codex CLI orchestrates models, tools, prompts, and performance using the Responses API.