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OpenAI Compatible Anthropic Messages Responses API
🤖 AI Coding Agents
Pi
Codex CLI
Aider
Continue.dev
Cursor
Pi by Mario Zechner
1. Install
npm install -g @mariozechner/pi-coding-agent
2. Configure ~/.pi/agent/models.json
Codex CLI by OpenAI
1. Set environment variable
2. Configure ~/.codex/config.toml
Aider
Run with environment variables
Continue.dev VS Code extension
Add to ~/.continue/config.yaml
Cursor
Configure via the Cursor settings UI:
1. Open Settings > Models
2. Set "Override OpenAI Base URL" to:
3. Set "OpenAI API Key" to your API key
4. Add your model name:
2. Set "Override OpenAI Base URL" to:
SERVER_URL/v13. Set "OpenAI API Key" to your API key
4. Add your model name:
MODEL_NAME
💻 OpenAI Chat Completions /v1/chat/completions
curl
Python
Node.js
Go
curl (stream)
Python (stream)
Node.js (stream)
Go (stream)
curl
Python pip install openai
Node.js / TypeScript npm install openai
Go github.com/sashabaranov/go-openai
curl with -N for unbuffered output
Python pip install openai
Node.js / TypeScript npm install openai
Go github.com/sashabaranov/go-openai
🧠 Anthropic Messages API /v1/messages
curl
Python
curl (stream)
Python (stream)
curl
Uses the Anthropic x-api-key header and anthropic-version header.
Python pip install anthropic
curl streaming with -N
Python pip install anthropic
🔭 OpenAI Responses API /v1/responses
curl
Python
curl (stream)
Python (stream)
curl
The newer OpenAI Responses API uses a simpler input field instead of a messages array.
Python pip install openai
curl streaming with -N
Python pip install openai
📄 Response Formats
Chat Completions
Chat Completions (SSE)
Messages API
Messages API (SSE)
Responses API
Responses API (SSE)
Chat Completions /v1/chat/completions
Standard OpenAI chat completions response format.
{
"id": "chatcmpl-abc123",
"object": "chat.completion",
"created": 1700000000,
"model": "your-model-name",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "Hello! Here's a fun fact: ..."
},
"finish_reason": "stop"
}
],
"usage": {
"prompt_tokens": 12,
"completion_tokens": 42,
"total_tokens": 54
}
}
Chat Completions Streaming Server-Sent Events
When stream: true, returns SSE events with delta content.
data: {"id":"chatcmpl-abc123","object":"chat.completion.chunk","created":1700000000,"model":"your-model-name","choices":[{"index":0,"delta":{"role":"assistant","content":""},"finish_reason":null}]}
data: {"id":"chatcmpl-abc123","object":"chat.completion.chunk","created":1700000000,"model":"your-model-name","choices":[{"index":0,"delta":{"content":"Hello"},"finish_reason":null}]}
data: {"id":"chatcmpl-abc123","object":"chat.completion.chunk","created":1700000000,"model":"your-model-name","choices":[{"index":0,"delta":{"content":"!"},"finish_reason":null}]}
data: {"id":"chatcmpl-abc123","object":"chat.completion.chunk","created":1700000000,"model":"your-model-name","choices":[{"index":0,"delta":{},"finish_reason":"stop"}]}
data: [DONE]
Anthropic Messages /v1/messages
Standard Anthropic Messages API response format.
{
"id": "msg_abc123",
"type": "message",
"role": "assistant",
"content": [
{
"type": "text",
"text": "Hello! Here's a fun fact: ..."
}
],
"model": "your-model-name",
"stop_reason": "end_turn",
"usage": {
"input_tokens": 10,
"output_tokens": 42
}
}
Anthropic Messages Streaming Server-Sent Events
When stream: true, returns named SSE events with content deltas.
event: message_start
data: {"type":"message_start","message":{"id":"msg_abc123","type":"message","role":"assistant","content":[],"model":"your-model-name"}}
event: content_block_start
data: {"type":"content_block_start","index":0,"content_block":{"type":"text","text":""}}
event: content_block_delta
data: {"type":"content_block_delta","index":0,"delta":{"type":"text_delta","text":"Hello!"}}
event: content_block_stop
data: {"type":"content_block_stop","index":0}
event: message_delta
data: {"type":"message_delta","delta":{"stop_reason":"end_turn"},"usage":{"output_tokens":42}}
event: message_stop
data: {"type":"message_stop"}
OpenAI Responses /v1/responses
Newer OpenAI Responses API format.
{
"id": "resp_abc123",
"object": "response",
"created_at": 1700000000,
"model": "your-model-name",
"output": [
{
"type": "message",
"role": "assistant",
"content": [
{
"type": "output_text",
"text": "Hello! Here's a fun fact: ..."
}
]
}
],
"usage": {
"input_tokens": 10,
"output_tokens": 42,
"total_tokens": 52
}
}
Responses API Streaming Server-Sent Events
When stream: true, returns named SSE events.
event: response.created
data: {"type":"response.created","response":{"id":"resp_abc123","object":"response","status":"in_progress"}}
event: response.output_text.delta
data: {"type":"response.output_text.delta","delta":"Hello"}
event: response.output_text.delta
data: {"type":"response.output_text.delta","delta":"!"}
event: response.output_text.done
data: {"type":"response.output_text.done","text":"Hello!"}
event: response.completed
data: {"type":"response.completed","response":{"id":"resp_abc123","object":"response","status":"completed"}}
🚀 Try It Live
Response will stream here…
📚 Quick Reference
API Base URL
SERVER_URL/v1
Authorization Header
Bearer API_KEY
Supported Endpoints
/v1/chat/completions · /v1/messages · /v1/responses · /v1/models
Documentation