AnkitAI

Parable-Qwen3-4B-Claude-Fable-5

README

License: apache-2.0

v2.1 (2026-08-03)

Recalibrated merge. Same training, better weight blending: +1.8 points on HumanEval-164 over the previous build (74.4 vs 72.6), reproduced across three independent adapters. If you pulled this model before August 2026, re-pull for the stronger build.

What it is good at

It answers. Base Qwen3-4B spends its whole budget inside <think> on 34% of ordinary prompts and returns nothing. This model answers 34/34 on the same suite, with 140x less reasoning text and no thinking-mode flag to manage.
Agent-shaped reasoning. Trained on genuine multi-step agent sessions, so plans, tool selection and terminal workflows come out structured instead of improvised.
Small enough to keep open. 4B parameters, and the GGUF build is 2.5 GB. Laptop, old GPU, modest desktop — it runs offline, with your code staying on your machine.

Evaluation

Measured on identical harnesses, greedy decoding, Q4_K_M builds, thinking disabled on every row.

Table with columns: Base Qwen3-4B, This model (v2.1)
	Base Qwen3-4B	This model (v2.1)
Prompts answered (34-prompt suite)	27/34	34/34
HumanEval-164	79.3	74.4
Held-out agent-trace loss	2.846	1.876
BFCL simple_python	95.3	92.3
BFCL multiple	94.5	90.0

Choosing between this and the base

Take this model for local agent and coding work where you want structured, reliable answers every time: it fits the agent-session distribution far better and never silently returns empty.

Take the base model if your workload is maximum-accuracy function calling in a tool-calling harness, where its few extra points matter more than reasoning style.

Model details

Base: Qwen/Qwen3-4B (4B, Apache-2.0)
Method: QLoRA (nf4, r16, alpha 32) on all-linear targets, completion-only loss masking, 30% general-instruction replay mix, seed-averaged weights, merged at scale 0.6 (v2.1 recalibration)
Data: genuine Claude Fable 5 agent sessions + gpt5.5-terminal transcripts, deduplicated and decontaminated against the reported benchmarks
Method report: doi:10.5281/zenodo.21676407

Provenance & licensing

Fine-tuned from Qwen/Qwen3-4B (Apache-2.0). Training data: Glint-Research/Fable-5-traces (AGPL-3.0) and Roman1111111/gpt5.5-terminal (MIT). Because those traces originate from third-party assistants, the providers' terms may apply to downstream training and distillation. If you plan to build on this model commercially, confirm your use aligns with those terms.

Support the Project

If this model is useful in your work, you can support independent research:

Citation

bibtex

@misc{aglawe2026agenttrace,  author    = {Aglawe, Ankit},  title     = {Agent-Trace Fine-Tuning of Small Language Models under Constrained Compute},  year      = {2026},  publisher = {Zenodo},  doi       = {10.5281/zenodo.21676407},  url       = {https://doi.org/10.5281/zenodo.21676407}}

Acknowledgements

The Qwen team for the base model; Glint-Research and Roman1111111 for the trace datasets; empero-ai for the recipe this series iterates on.

Available on FriendliAI

Dedicated Endpoints

Run this model inference on single tenant GPU with unmatched speed and reliability at scale.

Learn more

Model Details

Model Provider

AnkitAI

Model Tree

Base

Qwen/Qwen3-4B

Fine-tuned

this model

Input Modalities

Text

Output Modalities