OpenAI Responses API
The Responses API is OpenAI's recommended API primitive for new projects, an evolution of Chat Completions with built-in tools like web search, file search, code interpreter, and support for agentic workflows.
Documentation
Specifications
OpenAPI
https://github.com/openai/openai-openapi/blob/master/openapi.yaml
OpenAPI
https://raw.githubusercontent.com/api-evangelist/chatgpt/refs/heads/main/openapi/chatgpt-responses-api-openapi.yml