Chat API Request Builder
Configure parameters, manage conversation message history, and instantly generate production-ready OpenAI or Anthropic Chat Completion API payloads.
Valid JSON
Building Chat API Requests
Chat completion endpoints require precise message sequencing (`system`, `user`, `assistant`) alongside hyperparameters to dictate model creativity, response bounds, and streaming delivery mechanisms.
Frequently Asked Questions (FAQ)
Anthropic separates system instructions into a dedicated top-level parameter while formatting role messages and max tokens (`max_tokens`) accordingly for Claude models.
This tool generates clean, production-ready JSON payloads for integration into your backend codebases or API clients like cURL, Postman, or Thunder Client.