Build an app with the Responses API
Create a campaign studio that turns a brief into polished copy and generated visual directions.
Codex
Build faster with the OpenAI API in Codex
Codex is OpenAI’s coding agent for software development. Codex is included in your ChatGPT Plan and you can start for free. Use it to scaffold new API apps, upgrade to new models or SDKs, and improve production code.
Build a new app
Build an agent with the Agents SDK
Create a launch-planning agent with a frontend, useful tools, and observability hooks.
Build a realtime audio app
Make a voice-first worldbuilding companion with low-latency audio interactions.
Improve an existing app
Upgrade to the latest model
Create a no-code-change plan to modernize model/API usage while preserving behavior.
Optimize my API implementation
Create a no-code-change optimization plan for quality, latency, reliability, and cost.
Migrate from Responses API to Agents SDK
Create a no-code-change migration plan for whether and how to move to the Agents SDK.