schnow265/janhq_Jan-v3.5-4B-heretic

TEXT GENERATIONConcurrency Cost:1Model Size:4BQuant:BF16Ctx Length:32kTool Calling:SupportedPublished:Jun 14, 2026License:apache-2.0Architecture:Transformer0.0K Open Weights Cold

schnow265/janhq_Jan-v3.5-4B-heretic is a 4 billion parameter decensored variant of janhq/Jan-v3.5-4B, built using the Heretic v1.3.0 framework. Based on the Qwen3-4B architecture, this model retains the original's specialized mathematical reasoning capabilities and distinct personality. It is optimized for use cases requiring enhanced math problem-solving and a unique, casual conversational style, while offering reduced refusal rates compared to its base model.

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Model Overview: schnow265/janhq_Jan-v3.5-4B-heretic

This model is a decensored version of the janhq/Jan-v3.5-4B, created with Heretic v1.3.0. It maintains the core characteristics of its base model, which is a 4 billion parameter variant of the Qwen3-4B architecture, fine-tuned by Menlo Research.

Key Differentiators & Capabilities

  • Decensored Output: Achieves a significantly lower refusal rate (15/100) compared to the original model (100/100), as measured by KL divergence of 0.0287.
  • Specialized Personality: Features a distinct, casual, and self-aware conversational style, avoiding generic AI phrases. It uses lowercase by default and incorporates humor and specific values like user freedom and transparency.
  • Enhanced Math Reasoning: Retains and improves upon the mathematical problem-solving capabilities of its base model, having been specialized on math reasoning datasets.
  • Reproducible: The decensoring process is documented and reproducible, with specific abliteration parameters detailed.

Good For

  • Applications requiring a conversational AI with a unique, non-generic personality.
  • Tasks demanding enhanced mathematical reasoning and problem-solving.
  • Use cases where a lower refusal rate and more direct responses are preferred.
  • Serving as a fine-tuning starting point for further math-heavy or identity-specific applications.