The Agents API runs agents on a managed Codex harness with OpenAI handling session orchestration, context compaction and recovery. It offers durable sessions, streaming, your own tools and MCP servers, and hosted or self-provided sandboxes.
OpenAI is an American artificial intelligence (AI) public benefit corporation (PBC) headquartered in San Francisco, California. It develops proprietary generative AI models, particularly its generative pre-trained transformer (GPT) series of large language models.