更新日: 2026-06-06

Chat Completion Object

/v1/chat/completions returns chat.completion for non-streaming requests and chat.completion.chunk for streaming requests. This page focuses on the most stable, broadly useful OpenAI-compatible response structure on Crazyrouter today.

Non-streaming object

Minimal production request:

cURL

curl https://api.crazyrouter.com/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "gpt-5.5",
    "messages": [
      {
        "role": "user",
        "content": "Explain what a REST API is in one sentence."
      }
    ],
    "max_tokens": 64
  }'

Typical production response skeleton:

{
  "id": "chatcmpl-xxx",
  "object": "chat.completion",
  "created": 1774177466,
  "model": "gpt-5.5",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "...",
        "reasoning_content": null,
        "tool_calls": null
      },
      "finish_reason": "stop"
    }
  ]
}

How to read it

message.content is the final text answer
message.tool_calls only appears when the model is requesting tool execution
message.reasoning_content may appear for some models or routes, but should not currently be treated as a guaranteed field

Streaming object

For streaming requests, the server returns chat.completion.chunk SSE events:

{
  "id": "chatcmpl-xxx",
  "object": "chat.completion.chunk",
  "created": 1774177466,
  "model": "gpt-5.5",
  "choices": [
    {
      "index": 0,
      "delta": {
        "role": "assistant",
        "content": "..."
      },
      "finish_reason": null
    }
  ]
}

Common SSE shape:

data: {"object":"chat.completion.chunk",...}
data: {"choices":[{"delta":{"content":"..."}}],...}
data: [DONE]

Fields you will usually care about

Field	Meaning
`object`	`chat.completion` for non-streaming, `chat.completion.chunk` for streaming
`model`	The actual model used for the response
`choices[].message.content`	Final non-streaming text
`choices[].message.tool_calls`	Non-streaming tool requests
`choices[].delta.content`	Streaming text delta
`choices[].finish_reason`	Stop reason such as `stop`, `length`, or `tool_calls`

Upstream models may pass through extra fields. Client code should rely on the stable common fields first rather than assuming every model exposes the same extensions.

Create Chat Completion

Chat - OpenAI

Chat - Claude

Chat - Gemini

Chat - Responses API

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Chat Completion Object

Chat Completion Object

Non-streaming object

How to read it

Streaming object

Fields you will usually care about

​Chat Completion Object

​Non-streaming object

​How to read it

​Streaming object

​Fields you will usually care about

Chat Completion Object

Non-streaming object

How to read it

Streaming object

Fields you will usually care about