OpenAI launches Agents API: managed Codex harness
OpenAI's Agents API brings the open-source Codex harness to a managed API, letting developers run cloud agents with pay-per-use pricing and sandbox partner options.
smolagents: Hugging Face's Code-First Python Agent Library
Hugging Face's open-source Python agent library where the model writes executable code instead of JSON. 27.8k stars, Apache 2.0, v1.26.0 (May 29, 2026). Remote sandboxing is mandatory.