OpenAI has opened the Agents API public beta to all developers, enabling them to build and run cloud-based agents using the Codex agent runtime framework. OpenAI handles model calls, tool use, task orchestration, long-running sessions and context management, while developers define agent capabilities and choose code execution and file-processing environments. Developers can connect their own sandboxes or third-party services, selecting CPU, GPU, memory, file and secret storage configurations as needed, with support for fully managed environments or deployment inside their own VPC. Initial deep integration partners include Blaxel, Cloudflare, Daytona, DigitalOcean, E2B, Modal, Oracle, Runloop and Vercel. OpenAI also launched an official managed sandbox service for code execution, file processing and artifact generation, with support for adding files, software packages, skills and plugins. The Agents API supports automatic context compression, tool search and parallel collaboration among sub-agents; the API itself carries no additional fee, with developers paying for tokens and tools consumed by agents.