{
  "leg": "C2",
  "item_id": "c2-re-1",
  "category": "shell-regex",
  "proxy_item": false,
  "model": "qwen3.6:27b",
  "think": false,
  "posture": "think:false",
  "reasoning_strength": null,
  "repeat": 1,
  "started_at": "2026-08-26T14:00:52.381459Z",
  "num_predict": 1536,
  "timeout_s": 240,
  "request": {
    "model": "qwen3.6:27b",
    "stream": false,
    "think": false,
    "options": {
      "num_ctx": 32768,
      "temperature": 0,
      "top_p": 1,
      "num_predict": 1536
    },
    "messages": [
      {
        "role": "user",
        "content": "Every line of a log file has exactly this shape, single-spaced:\n\n<ip> - <METHOD> <path> <status> <bytes>\n\nGive a Python regular expression that matches exactly those lines whose status field is a 5xx code (500-599), and no others. Note that a byte count can also look like a 5xx number, so a pattern that hunts anywhere on the line will be wrong.\n\nReply with the regular expression alone on one line: no quotes, no slashes, no r-prefix, no explanation."
      }
    ]
  },
  "answer": "^\\S+ - \\S+ \\S+ 5\\d{2} \\S+$",
  "thinking": "",
  "done_reason": "stop",
  "timing": {
    "wall_s": 0.989,
    "total_duration_s": 0.987,
    "load_duration_s": 0.281,
    "prompt_eval_count": 129,
    "prompt_eval_duration_s": 0.256,
    "eval_count": 20,
    "eval_duration_s": 0.304,
    "eval_tok_s": 65.73
  },
  "error": null
}