Compact a conversation

curl -X POST https://api.openai.com/v1/responses/compact \
    -H "Content-Type: application/json" \
    -H "Authorization: Bearer $OPENAI_API_KEY" \
    -d '{
      "model": "gpt-5.1-codex-max",
      "input": [
        {
          "role": "user",
          "content": "Create a simple landing page for a dog petting café."
        },
        {
          "id": "msg_001",
          "type": "message",
          "status": "completed",
          "content": [
            {
              "type": "output_text",
              "annotations": [],
              "logprobs": [],
              "text": "Below is a single file, ready-to-use landing page for a dog petting café:..."
            }
          ],
          "role": "assistant"
        }
      ]
    }'

{
  "id": "resp_001",
  "object": "response.compaction",
  "created_at": 1764967971,
  "output": [
    {
      "id": "msg_000",
      "type": "message",
      "status": "completed",
      "content": [
        {
          "type": "input_text",
          "text": "Create a simple landing page for a dog petting cafe."
        }
      ],
      "role": "user"
    },
    {
      "id": "cmp_001",
      "type": "compaction",
      "encrypted_content": "gAAAAABpM0Yj-...="
    }
  ],
  "usage": {
    "input_tokens": 139,
    "input_tokens_details": {
      "cached_tokens": 0
    },
    "output_tokens": 438,
    "output_tokens_details": {
      "reasoning_tokens": 64
    },
    "total_tokens": 577
  }
}