abhinav0231/Lily-1.5b-v0.1

Hugging Face
TEXT GENERATIONConcurrency Cost:1Model Size:1.5BQuant:BF16Ctx Length:32kPublished:Apr 20, 2026License:apache-2.0Architecture:Transformer0.0K Open Weights Warm

Lily 1.5B v0.1 by abhinav0231 is a 1.5 billion parameter language model fine-tuned from Qwen 2.5 1.5B Instruct. It is specifically designed to perform explicit, step-by-step reasoning within tags before providing a final answer in tags. This model excels at structured problem-solving, code explanation, and general-purpose assistance where reasoning transparency is crucial, operating within a 4096 token context length.

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Overview

Lily 1.5B v0.1 is a 1.5 billion parameter language model developed by abhinav0231, fine-tuned from the Qwen 2.5 1.5B Instruct base model. Its core differentiator is its explicit chain-of-thought reasoning process, where it first generates step-by-step reasoning within <think> tags, followed by the final, precise answer within <answer> tags. This structured output makes the model's thought process transparent and auditable.

Key Capabilities

  • Transparent Reasoning: Provides visible intermediate reasoning steps, enhancing clarity and debuggability.
  • Structured Output: Adheres to a consistent <think>...</think><answer>...</answer> format.
  • Precision and Directness: Optimized to avoid filler phrases and scale response depth to question complexity.
  • General-Purpose Assistance: Functions as a versatile assistant for various tasks.

Ideal Use Cases

  • Reasoning and Logic Problems: Effective for tasks requiring structured thought.
  • Code Explanation and Generation: Can break down code logic and assist in code creation.
  • Structured Question Answering: Delivers precise and organized responses.
  • Step-by-Step Problem Solving: Useful in scenarios where the process to the answer is as important as the answer itself.
  • Applications requiring Reasoning Transparency: Suitable for grading, debugging, or tutoring where understanding why an answer is given is critical.

Limitations

  • Parameter Size: At 1.5B, it is not suited for tasks requiring extensive world knowledge or very long multi-document contexts.
  • Language Focus: Primarily trained on English data, limiting multilingual performance.
  • No Tool Use: This version does not support function calling or structured tool outputs.