Machine Learning Algorithms & Natural Language Processing

Apr 11, 2026 · Artificial Intelligence

From Claude Code to Codex: Migrating Anthropic’s Harness Design

The author reproduces Anthropic’s long‑running harness architecture on a Codex + GPT stack, separates planner, generator, and evaluator roles, persists state to concrete artifacts, adds strict execution constraints, and demonstrates that the approach improves task success despite higher costs, while highlighting practical pitfalls and cost‑control strategies.