API Playground
Build AI API requests for OpenAI, Anthropic, Google, Mistral, xAI, and DeepSeek. Preview endpoints, auth headers, and request bodies with real-time cost estimates. No API key needed.
Provider & Model
200,000 context tokens · max output 32,768
Prompt
Estimated input tokens: 19
Parameters
Request Preview
Client-side only. No API calls are made.
Endpoint
https://api.openai.com/v1/chat/completions
Auth header format
Authorization: Bearer $OPENAI_API_KEY
Request body template
{
"model": "codex-mini-latest",
"messages": [
{
"role": "system",
"content": "You are a helpful assistant."
},
{
"role": "user",
"content": "Write a short welcome message for a new developer."
}
],
"temperature": 0.7,
"max_tokens": 512
}Cost Breakdown
Input tokens19
Input price$0.000029
Output tokens512
Output price$0.0031
Total per request$0.0031
19 input tokens × $1.5/1M + 512 output tokens × $6/1M