As reported by explainx, on August 19, 2026, OpenAI launched the Codex open-source Agent framework, a project developed by Nicolas Bonamy and Derrick Choi. This innovative framework integrates Agent capabilities as foundational infrastructure, enabling seamless embedding into third-party products and positioning itself as a direct competitor to Anthropic's Claude Agent SDK. The Codex framework offers a three-tiered approach to integration: codex exec is tailored for scripting and continuous integration (CI) tasks, Codex SDK facilitates the programmatic initiation and management of Agent tasks, and Codex app-server provides conversation state management and streaming event processing capabilities. Furthermore, OpenAI has introduced a sample application named Relay, which serves as a practical demonstration of how Agents can be integrated into operational workflows. In the ARC-AGI-3 test, when combined with context compression technology, the framework significantly enhanced the GPT-5.6 Sol score, elevating it from 13.3% to an impressive 38.3%.