Structured Outputs

curl -X POST https://api.geekhub.mx/v1/chat/completions \
  -H "Authorization: Bearer ghub_sk_live_YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-5.4-mini",
    "messages": [
      {"role":"system","content":"You extract data from invoices."},
      {"role":"user","content":"Invoice #A123 from Geek Vibes for $12,345.67 dated June 12, 2026."}
    ],
    "response_format": {
      "type": "json_schema",
      "json_schema": {
        "name": "invoice",
        "strict": true,
        "schema": {
          "type": "object",
          "properties": {
            "number": { "type": "string" },
            "issuer": { "type": "string" },
            "total_usd": { "type": "number" },
            "date_iso": { "type": "string", "format": "date" }
          },
          "required": ["number", "issuer", "total_usd", "date_iso"],
          "additionalProperties": false
        }
      }
    }
  }'

"response_format": { "type": "json_object" }

HTTP/1.1 422 Unprocessable Entity

{
  "error": {
    "type": "structured_outputs_not_supported",
    "message": "Model \"deepseek/deepseek-v4-flash\" does not support structured outputs.",
    "model": "deepseek/deepseek-v4-flash",
    "compatible_models": [
      "anthropic/claude-opus-4-8",
      "openai/gpt-5.4-mini",
      "..."
    ]
  }
}