AI Tech Publishing

Mar 6, 2026 · Artificial Intelligence

How Codex CLI Compresses Context: Inside the compact() API

The article dissects Codex CLI's two compression paths—local LLM summarization for non‑Codex models and an encrypted compact() API for Codex models—by injecting prompts, extracting system, handoff, and compression prompts, and comparing them with open‑source references to reveal the underlying mechanism.