Developer Tools
Prompt Formatter
Convert system and user messages into OpenAI, Claude, Gemini, or Llama API format. Copy-paste ready JSON.
{
"model": "gpt-4o",
"messages": [
{
"role": "system",
"content": "You are a helpful assistant."
},
{
"role": "user",
"content": "Explain quantum computing in simple terms."
}
]
}LLM Prompt Formatting: OpenAI, Claude, Gemini, and Llama API Formats Explained
How to format system and user messages for the OpenAI, Claude, Gemini, and Llama APIs. Covers messages array, system fields, and chat template tokens.