OpenAI REST API

Direct HTTP integration with OpenAI API. For SDK usage, see openai-sdk skill.

Base URL & Authentication

Base URL: https://api.openai.com/v1

curl https://api.openai.com/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $OPENAI_API_KEY" \
  -d '{...}'

Optional headers:

• OpenAI-Organization: org-xxx — for multi-org accounts
• OpenAI-Project: proj-xxx — for project-specific billing

Core Endpoints

Endpoint	Method	Use Case
/chat/completions	POST	Text generation, chat
/embeddings	POST	Vector embeddings
/images/generations	POST	DALL-E image creation
/audio/transcriptions	POST	Whisper speech-to-text
/audio/speech	POST	TTS text-to-speech
/models	GET	List available models

Quick Reference

Chat Completions (most common)

curl https://api.openai.com/v1/chat/completions \
  -H "Authorization: Bearer $OPENAI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "gpt-4o",
    "messages": [
      {"role": "system", "content": "You are a helpful assistant."},
      {"role": "user", "content": "Hello!"}
    ]
  }'

Response structure:

{
  "id": "chatcmpl-xxx",
  "choices": [{
    "message": {"role": "assistant", "content": "Hi! How can I help?"},
    "finish_reason": "stop"
  }],
  "usage": {"prompt_tokens": 10, "completion_tokens": 8, "total_tokens": 18}
}

Embeddings

curl https://api.openai.com/v1/embeddings \
  -H "Authorization: Bearer $OPENAI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "text-embedding-3-small", "input": "Hello world"}'

Streaming

Add "stream": true to request. Response is SSE:

data: {"choices":[{"delta":{"content":"Hello"}}]}
data: {"choices":[{"delta":{"content":" world"}}]}
data: [DONE]

References

• authentication.md — API keys, organization/project IDs
• chat-completions.md — Full Chat Completions API
• models.md — Model list, capabilities, pricing tiers
• errors.md — Error codes, retry strategies, rate limits

Official Documentation

For latest/complete docs, fetch:

• https://cdn.openai.com/API/docs/txt/llms-api-reference.txt
• https://cdn.openai.com/API/docs/txt/llms-guides.txt