{
  "evaluatedAt": "2026-10-20T08:59:41.428Z",
  "environment": "development",
  "endpoint": "/api/grade",
  "codeRevision": "8f9ae4ea8a94008625212f98cf93b5d0f3bea4e8",
  "runsPerWorksheet": 1,
  "referenceMethod": "Self-created questions and reference answers, reviewed against arithmetic and elementary English rules. Not an independent teacher benchmark.",
  "inputType": "self-created printed questions and typed answers",
  "samples": [
    {
      "id": "maths",
      "subject": "MATH",
      "status": "COMPLETED",
      "model": "qwen3.8-flash",
      "processingTimeMs": 17915,
      "questions": [
        {
          "number": 1,
          "studentAnswer": "56",
          "correctAnswer": "56",
          "isCorrect": true,
          "explanation": null
        },
        {
          "number": 2,
          "studentAnswer": "136",
          "correctAnswer": "126",
          "isCorrect": false,
          "explanation": "計算結果為 126。"
        },
        {
          "number": 3,
          "studentAnswer": "3/4",
          "correctAnswer": "$\\frac{3}{4}$",
          "isCorrect": true,
          "explanation": null
        },
        {
          "number": 4,
          "studentAnswer": "4 pencils",
          "correctAnswer": "4 pencils",
          "isCorrect": true,
          "explanation": null
        },
        {
          "number": 5,
          "studentAnswer": "$375",
          "correctAnswer": "$37.50",
          "isCorrect": false,
          "explanation": "你的數字是對的，但小數點的位置跑掉了！$3.75 \\times 10$ 應該是把小數點向右移一位，變成 $37.50$。記住：乘以 10 只是移動小數點，不是把數字變大十倍哦 ✨"
        },
        {
          "number": 6,
          "studentAnswer": "40 cm",
          "correctAnswer": "26 cm",
          "isCorrect": false,
          "explanation": "你可能不小心算成面積了（$8 \\times 5 = 40$）。周長是繞圖形一圈的長度，公式是 $(長+寬) \\times 2$。試試看 $(8+5) \\times 2$，你會發現答案是 26 cm 💪"
        }
      ]
    },
    {
      "id": "english",
      "subject": "ENGLISH",
      "status": "COMPLETED",
      "model": "qwen3.8-flash",
      "processingTimeMs": 13724,
      "questions": [
        {
          "number": 1,
          "studentAnswer": "goes",
          "correctAnswer": "goes",
          "isCorrect": true,
          "explanation": null
        },
        {
          "number": 2,
          "studentAnswer": "play",
          "correctAnswer": "played",
          "isCorrect": false,
          "explanation": "You used the present tense, but 'Yesterday' tells us the action happened in the past. Remember to change the verb to its past form when you see time words like yesterday. Try adding '-ed' to 'play' next time! ✨"
        },
        {
          "number": 3,
          "studentAnswer": "children",
          "correctAnswer": "children",
          "isCorrect": true,
          "explanation": null
        },
        {
          "number": 4,
          "studentAnswer": "becuase",
          "correctAnswer": "because",
          "isCorrect": false,
          "explanation": "Almost there! You spelled 'because' as 'becuase'. Notice how the 'e' comes before the 'a' in the middle part of the word. Let's practice writing b-e-c-a-u-s-e a few times to remember the order 💪"
        },
        {
          "number": 5,
          "studentAnswer": "an",
          "correctAnswer": "an",
          "isCorrect": true,
          "explanation": null
        },
        {
          "number": 6,
          "studentAnswer": "is",
          "correctAnswer": "are",
          "isCorrect": false,
          "explanation": "Great effort! Look at the subject 'Tom and I'. Since this includes two people, it is plural, just like 'they'. When the subject is plural, we use 'are' instead of 'is'. Try saying 'We are friends' to help you remember! 🌟"
        }
      ]
    }
  ]
}