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Model: SynastriaNetworks/OpenFable-4B Source: Original Platform
2026-06-24 12:11:16 +08:00
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+---
+base_model: unsloth/qwen3-4b-unsloth-bnb-4bit
+tags:
+- text-generation-inference
+- transformers
+- unsloth
+- qwen3
+license: apache-2.0
+language:
+- en
+---
+
+# OpenFable-4B
+
+> *"The US banned Fable 5 outside America. I'm outside America. So I made my own."*
+
+**OpenFable-4B** is a fine-tune of [Qwen3-4B](https://huggingface.co/Qwen/Qwen3-4B) designed to replicate the conversational style, reasoning depth, and structured output quality of Claude Fable 5 — built entirely from scratch by a solo developer in Brazil.
+
+This is not a generic instruction-tuned model. It's a deliberate attempt to bring Fable-style responses to the open-source ecosystem, with a custom-built dataset and a personality baked into the chat template.
+
+---
+
+## What makes it different
+
+- **Style-first fine-tune** — trained to match Claude Fable 5's tone: direct, warm, structured, and non-verbose
+- **Custom dataset** — ~300 hand-curated examples across coding, math, agentic planning, and cybersecurity. No public synthetic datasets that leak CoT preambles
+- **Custom chat template** — default system prompt embedded in `tokenizer_config.json`: *"You are OpenFable, created by SynastrIA Networks"*
+- **GGUF quantized** — Q4_K_M, ready for local inference via llama.cpp, LM Studio, PocketPal, or Jan
+
+---
+
+## Benchmarks
+
+### MMLU — Zero-shot (no few-shot)
+
+OpenFable-4B was evaluated on MMLU with zero-shot prompting, achieving an overall score of **68.48%**.
+
+![OpenFable MMLU Benchmark](benchmark_mmlu.png)
+
+Strongest in Social Sciences. Weakest in Humanities — expected given the dataset skew toward technical and reasoning tasks.
+
+---
+
+### GSM8K — Comparison with 4B-class models
+
+OpenFable-4B holds its own against the competitive 4B landscape on grade-school math reasoning:
+
+![4B Models GSM8K Benchmark](benchmark_gsm8k.png)
+
+OpenFable matches top-tier 4B models on math reasoning despite being a style fine-tune, not a reasoning-optimized model. The base Qwen3-4B it's built on scores ~76% — OpenFable closes that gap significantly through LoRA training.
+
+---
+
+## Model details
+
+| Property | Value |
+|---|---|
+| Base model | Qwen/Qwen3-4B |
+| Fine-tuning method | LoRA (via Unsloth) |
+| Dataset size | ~300 examples |
+| Quantization | Q4_K_M (GGUF) |
+| Context length | 32768 |
+| Language | English |
+| License | Apache 2.0 |
+
+---
+
+## Usage
+
+### llama.cpp
+
+```bash
+./llama-cli \
+  -m OpenFable-4B-Q4_K_M.gguf \
+  -p "You are OpenFable, created by SynastrIA Networks." \
+  --ctx-size 4096 \
+  -i
+```
+
+### Python (llama-cpp-python)
+
+```python
+from llama_cpp import Llama
+
+llm = Llama(
+    model_path="OpenFable-4B-Q4_K_M.gguf",
+    n_ctx=4096,
+    chat_format="chatml",
+)
+
+response = llm.create_chat_completion(
+    messages=[
+        {"role": "system", "content": "You are OpenFable, created by SynastrIA Networks."},
+        {"role": "user", "content": "Explain how LoRA fine-tuning works."},
+    ]
+)
+
+print(response["choices"][0]["message"]["content"])
+```
+
+### LM Studio / Jan / PocketPal
+
+Download the `.gguf` file and load it directly. The system prompt is already embedded in the tokenizer config — no manual setup required.
+
+---
+
+## Downloads
+
+| Format | Link |
+|---|---|
+| GGUF (Q4_K_M) | [gustajunq/OpenFable-4B-GGUF](https://huggingface.co/gustajunq/OpenFable-4B-GGUF) |
+| Org page | [SynastrIA Networks on HuggingFace](https://huggingface.co/SynastrIA-Networks) |
+
+---
+
+## Known limitations
+
+- Humanities performance lags behind other categories (~59.5% MMLU) — reflective of dataset composition
+- Style fine-tune, not RLHF-aligned — may occasionally drift on edge-case prompts
+- Not optimized for multilingual use — English only
+
+---
+
+## About
+
+Built by [Gustavo](https://huggingface.co/gustajunq) at [SynastrIA Networks](https://huggingface.co/SynastrIA-Networks) — a one-person AI startup from Brazil.
+
+OpenFable is part of the broader SynastrIA ecosystem, which includes [Lucian](https://github.com/synastriadev), an AI agent platform for creators.
+
+Follow the build-in-public journey: [@synastriadev](https://tiktok.com/@synastriadev) · [@openfable](https://tiktok.com/@openfable)
+
+---
+
+*V2 — June 2026*