Agent Development Kit (ADK) vs ChatGPT

ADK is Google's open-source framework for writing AI agents in code; ChatGPT is OpenAI's chat app. They don't compete. People searching "adk chatgpt" usually want one of two things: to use OpenAI's models inside an ADK agent (you can), or OpenAI's own equivalent of ADK, which is the Agents SDK rather than ChatGPT.

What ADK gives you

ADK (Agent Development Kit) is Apache 2.0 licensed and comes in Python, TypeScript, Go, Java and Kotlin. You install it with pip install google-adk (or npm install @google/adk), define agents and tools in code, and test them in its web dev UI or from the command line. The Python package reached v2.12.0 on 13 October 2026.

It's built with Gemini in mind, but its model docs cover Claude directly and connectors for LiteLLM, Ollama, vLLM and others, and there's a page on OpenAI models. When you're done you can deploy to Google Cloud (Agent Runtime, Cloud Run, GKE) or put it in a container on your own servers. The framework is free; you pay whichever model provider you call.

If you meant OpenAI's version

OpenAI's code-first agent framework is the Agents SDK, MIT-licensed, in Python and JavaScript. That's the like-for-like comparison with ADK: both are libraries you write agents with, and each leans toward its own company's models while accepting others.

Where ChatGPT fits

ChatGPT is the product you use directly, not a toolkit. Plans are Free, Go at $8 a month, Plus at $20, Pro from $100 (with $200 and $500 tiers), and Business at $25 per user monthly or $20 billed annually. A ChatGPT subscription doesn't pay for API calls: an ADK agent that uses GPT models needs an OpenAI API key, billed at API rates.