ChatGPT Responses API

The OpenAI API delivers direct access to GPT-4o for generating high-fidelity, conversational text responses via structured JSON or streaming endpoints.

Developers integrate the ChatGPT Responses API to power automated customer support, content synthesis, and complex reasoning tasks. By leveraging the chat completions endpoint (v1/chat/completions), users can configure temperature settings for creative variance or utilize function calling for precise data extraction. The system supports 128k context windows and handles high-throughput requests with sub-second latency for real-time applications.

https://openai.com/blog/openai-api