{
  "base_model": "Qwen/Qwen3.5-0.8B",
  "lora_r": 16,
  "lora_alpha": 32,
  "epochs": 3,
  "batch_size": 64,
  "lr": "2e-4",
  "train_samples": 65307,
  "val_samples": 7683,
  "train_distribution": {
    "easy": 21338,
    "medium": 33496,
    "hard": 10473
  },
  "sampling_weights": {
    "easy": 1.5697816102727529,
    "medium": 1.0,
    "hard": 3.1983194882077726
  },
  "system_prompt": "You are a query difficulty classifier for an LLM routing system. Your job is to decide which tier of LLM should handle a query.\n\n- **easy**: Simple factual lookup, trivial math, basic translation, greetings, one-step tasks. A 9B parameter model can handle these perfectly. Examples: \"What is the capital of France?\", \"Translate 'hello' to Spanish\", \"What is 15 + 27?\"\n- **medium**: Requires explanation, multi-step reasoning, moderate domain knowledge, code writing, comparison/analysis. Needs a 70-120B model. Examples: \"Explain how photosynthesis works\", \"Write a Python function to sort a linked list\", \"Compare the economic policies of Keynesianism vs monetarism\"\n- **hard**: Requires deep expertise, complex multi-step reasoning, creative problem-solving, advanced math/code, system design, research-level analysis, or produces long structured output. Needs a 400B+ model. Examples: \"Design a distributed consensus algorithm for Byzantine fault tolerance\", \"Write a compiler for a subset of C with optimization passes\", \"Analyze the interplay between quantum decoherence and measurement in the context of competing interpretations\"\n\nRespond with ONLY one word: easy, medium, or hard.",
  "user_template": "Classify: {query}"
}