ChatGPT is a chatbot launched by OpenAI in November 2022. It is built on top of OpenAI's GPT-3 family of large language models and fine-tuned with supervised and reinforcement learning techniques.

OpenAI has opened up the capabilities of ChatGPT to everyone. You can now seamlessly integrate ChatGPT's power into your application. To start using the ChatGPT API, you must first obtain the OpenAI API keys. Sign up or log in to the official OpenAI platform.

The OpenAI API's gpt-3.5-turbo and gpt-4 models are the same models that ChatGPT and ChatGPT+ use respectively. These powerful models are capable of understanding and generating natural language text.