Mozi-2b

Mozi-2b is a fine-tune of Qwen3.5-2B by MoziLabs. It keeps the base model's thinking mode, but it's trained to reason in a shorter, more adaptive way: quick answers for easy questions and fuller reasoning only when a problem needs it.

How it was made

  • Teacher: DeepSeek-V4.1-Flash (deepseek-flash) wrote a synthetic dataset of prompts, each with reasoning and a final answer.
  • Method: LoRA distillation (rank 16, 4-bit QLoRA), 2 epochs, learning rate 2e-4, max sequence length 2048. The reasoning was trained in Qwen3.5's native <think> format, and the LoRA was merged back into the full model.

Files

File Use
model.safetensors + tokenizer/config Full bf16 weights for ๐Ÿค— Transformers
Mozi-2b-Q8_0.gguf Q8_0 GGUF for Ollama / llama.cpp / LM Studio

Usage

Ollama

ollama run hf.co/MoziLabs/Mozi-2b:Q8_0

Transformers

from transformers import AutoModelForCausalLM, AutoTokenizer

tok = AutoTokenizer.from_pretrained("MoziLabs/Mozi-2b")
model = AutoModelForCausalLM.from_pretrained("MoziLabs/Mozi-2b", dtype="auto", device_map="auto")

messages = [{"role": "user", "content": "What is 17 * 23?"}]
text = tok.apply_chat_template(messages, add_generation_prompt=True, enable_thinking=True, tokenize=False)
inputs = tok(text, return_tensors="pt", add_special_tokens=False).to(model.device)
out = model.generate(**inputs, max_new_tokens=2048, temperature=0.6, top_p=0.95, top_k=20, do_sample=True)
print(tok.decode(out[0][inputs["input_ids"].shape[1]:], skip_special_tokens=True))

Limitations

  • On very hard problems it can still think for a long time before answering. Give it a generous token budget (8k+).
  • It's a 2B model: expect mistakes on difficult knowledge and math questions, and check anything important.
  • Text only: the vision part of Qwen3.5-2B is not included, so it can't read images.

Credits

Built on Qwen3.5-2B by the Qwen team (Apache-2.0).

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