Tools
Docs MCP
Search and read OpenAI developer docs from your editor using MCP.
Live Demo Showcase: Tools That 10x Your Codebase
Live walkthrough of Codex-powered tooling that accelerates software delivery.
Web search guide
Guide to using web search with the Responses API.
Batch API guide
Guide on how to use the Batch API to reduce costs
Built-in tools guide
Guide to using OpenAI's built-in tools with the Responses API.
File search guide
Guide to retrieving context from files using the Responses API.
Flex processing guide
Guide on how to reduce costs with flex processing
Function calling guide
Introduction to function calling with OpenAI models.
MCP guide
Guide to using the Model Context Protocol for portable tools.
MCP intro
Introduction video to Model Customization Platform (MCP).
Responses starter app
Starter application demonstrating OpenAI Responses API with tools.
Tools overview guide
Guide covering realtime delegation through tools.
Code interpreter guide
Guide to using the built-in code interpreter tool.
Guide to Using the Responses API's MCP Tool
Cookbook to connect external services using the Responses API MCP tool.