Skip to main content

​
Claude OpenAI-Compatible Chat

POST /v1/chat/completions
As of March 23, 2026, Crazyrouter production has verified:
  • non-stream claude-sonnet-4-6 requests return object: "chat.completion"
  • the current message reliably includes role and content
  • streaming requests return chat.completion.chunk
  • the SSE stream still ends with data: [DONE]

​
Non-Streaming Request

curl https://crazyrouter.com/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "claude-sonnet-4-6",
    "messages": [
      {"role": "system", "content": "You are a concise assistant."},
      {"role": "user", "content": "Compare PostgreSQL and MySQL in one paragraph."}
    ],
    "max_tokens": 256,
    "temperature": 0.2
  }'
Observed response shape: 
{
  "object": "chat.completion",
  "model": "claude-sonnet-4-6",
  "choices": [
    {
      "message": {
        "role": "assistant",
        "content": "PostgreSQL and MySQL are both popular..."
      }
    }
  ]
}

​
Streaming Request

curl https://crazyrouter.com/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "claude-sonnet-4-6",
    "messages": [
      {"role": "user", "content": "Say hello in one sentence."}
    ],
    "max_tokens": 128,
    "stream": true
  }'
The 2026-03-23 production streaming probe began like this: 
data: {"object":"chat.completion.chunk","model":"claude-sonnet-4-6","choices":[{"delta":{"role":"assistant"}}]}
data: {"object":"chat.completion.chunk","model":"claude-sonnet-4-6","choices":[{"delta":{"content":"Hello! ..."}}]}
data: [DONE]
If you need Claude-native thinking, native tool blocks, or document inputs, prefer Claude Messages.