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Structured Outputs

POST /v1/chat/completions
As of March 23, 2026, Crazyrouter production has verified that gpt-5.4 with response_format.type = "json_schema" returns directly parseable JSON. 
curl https://crazyrouter.com/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "gpt-5.4",
    "messages": [
      {
        "role": "user",
        "content": "Return the people and roles from: Alice is CTO. Bob is PM."
      }
    ],
    "response_format": {
      "type": "json_schema",
      "json_schema": {
        "name": "people_roles",
        "strict": true,
        "schema": {
          "type": "object",
          "properties": {
            "people": {
              "type": "array",
              "items": {
                "type": "object",
                "properties": {
                  "name": {"type": "string"},
                  "role": {"type": "string"}
                },
                "required": ["name", "role"],
                "additionalProperties": false
              }
            }
          },
          "required": ["people"],
          "additionalProperties": false
        }
      }
    }
  }'
The observed production message.content parsed directly as: 
{
  "people": [
    {
      "name": "Alice",
      "role": "CTO"
    },
    {
      "name": "Bob",
      "role": "PM"
    }
  ]
}

​
Consumer-Side Handling

import json

content = response["choices"][0]["message"]["content"]
data = json.loads(content)
This production pass only revalidated the strict json_schema path. The older json_object mode was not rechecked separately, so it is no longer kept as the primary example here.