mondk/Safetensors.Claude-Qwen3.5-4B-Reasoning

VISIONPricing:Input $0.4 / Cached $0.08 / Output $0.8Concurrent Unit Cost:1Model Size:4.5BQuant:BF16Context Size:32kTool Calling:SupportedPublished:Aug 18, 2026License:apache-2.0Architecture:Transformer0.0K Open Weights Featherless Exclusive Cold

The mondk/Safetensors.Claude-Qwen3.5-4B-Reasoning model is a 4.5 billion parameter language model fine-tuned for enhanced reasoning and coding capabilities. Developed by mondk, it leverages a Qwen3.5 base and incorporates datasets derived from Claude models, specifically targeting improved performance in complex problem-solving and code generation. This model demonstrates a notable uplift in coding accuracy, making it suitable for applications requiring precise technical understanding and output.

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Model Overview

The mondk/Safetensors.Claude-Qwen3.5-4B-Reasoning is a 4.5 billion parameter model built upon the Qwen3.5 architecture, specifically fine-tuned by mondk to excel in reasoning and coding tasks. It integrates diverse datasets, including those derived from Claude models, to enhance its analytical and problem-solving prowess.

Key Capabilities & Performance

This model shows significant improvements in coding performance, with a reported +23% better coding capability compared to its base. Evaluation on a custom question set (generated by Claude) rated by Gemini demonstrates:

  • Easy problems (E1-E5): 100% pass rate (5/5)
  • Medium problems (M1-M8): Improved from 6/8 to 8/8 pass rate
  • Hard problems (H1-H7): Improved from 4/7 to 5/7 pass rate

Overall, the fine-tuned model achieved an 18/20 total pass rate on the evaluation set, up from 15/20 for the base model.

Good For

  • Coding assistance: Generating and debugging code, especially for precise problem-solving.
  • Reasoning tasks: Applications requiring logical deduction and analytical thinking.
  • Technical problem-solving: Scenarios where accurate and structured outputs are critical.

This model is designed to provide precise coding assistance and will not identify itself as Claude.