Qwen3.8-27B-Fable-5-Coding-Distilled

Qwen3.8-27B-Coding-Distilled

Qwen3.8-27B-Coding-Distilled is a coding- and agentic-reasoning-focused fine-tune of Qwen/Qwen3.8-27B, trained on 195M tokens of distilled reasoning traces for software-engineering and debugging tasks.

The goal of this fine-tune is to push the base model toward grounded, tool-using reasoning — reading actual files, verifying assumptions against real state, and avoiding speculative "guess-and-write" behavior — rather than producing long, free-floating chains of thought that reason about a problem without ever checking it.

⚠️ Fill in / verify before publishing: exact license inheritance from the base model, full dataset composition and sourcing, training hyperparameters, and hardware — placeholders for these are marked below.

Model Details

Training Data

The model was fine-tuned on 195M tokens of reasoning traces distilled for coding and agentic-debugging scenarios. Traces emphasize:

• Reading and verifying project state (files, test harnesses, CI configs) before proposing a fix
• Working within existing code/output constraints instead of unnecessary rewrites
• Concise, evidence-grounded reasoning over long speculative chains

Intended Use

This model is intended for:

• Agentic coding assistants that need to inspect a repository before acting
• Debugging and root-cause analysis tasks (e.g., CI failures, lint errors, shell script bugs)
• Code review and refactoring within existing project constraints

It is not intended for use as a general-purpose chat assistant without further evaluation.

Example: Grounded vs. Speculative Reasoning

The distillation objective specifically targets the difference below, observed when comparing this fine-tune against the undistilled base model on an agentic bash-debugging task (a CI pipeline failing on a shell script with quoting bugs):

• This model (fine-tuned): Immediately inspects the actual project files (test harness, target script) before forming a fix, keeping its response short and grounded in verified state rather than assumptions.
• Base model: Reasons at length about what the script might contain, repeatedly acknowledges it hasn't seen the files, and ultimately proposes a fix based on guesses rather than a tool call — risking a rewrite that breaks pinned output formats the task explicitly asked to preserve.

This kind of "check before you fix" behavior is the primary signal the 195M-token distillation set was built to reinforce.

Limitations

• Inherits the general limitations of the Qwen3.8-27B base model (knowledge cutoff, potential hallucination on unfamiliar codebases, no execution sandboxing on its own).
• Distillation was focused on coding/agentic-debugging traces — general chat and non-coding reasoning quality has not been separately evaluated.
• As with any fine-tune, behavior on out-of-distribution tasks (outside shell/CI/test-harness-style debugging) should be validated before production use.

Citation

If you use this model, please cite:

@misc{qwen38_27b_coding_distilled,
  title  = {Qwen3.8-27B-Coding-Distilled},
  author = {khazarai},
  year   = {2026},
  note   = {Fine-tune of Qwen/Qwen3.8-27B, distilled on 195M tokens of agentic coding reasoning traces},
  url    = {https://huggingface.co/khazarai/Qwen3.8-27B-Coding-Distilled}
}

Acknowledgements

Built on top of Qwen/Qwen3.8-27B by the Qwen team.