Qwen + Fable · An open-weights agentic coding model. 35B Mixture-of-Experts (3B active), built by layering Claude Fable-5 agentic tool-use behavior on top of a Claude Opus 4.7 reasoning distill of Qwen3.6-35B-A3B.

This repository contains custom, highly optimized, multi-tier mixed precision GGUF weights for lordx64/Qwable-v1.

[!TIP] ℹ️ For advanced agentic and programming tasks, I highly recommend upgrading to Ornith-1.0-35B for significantly better performance.

Qwable-v1 is a 35B Mixture-of-Experts (3B active) hybrid architecture alternating between standard Attention and Mamba State-Space (SSM) blocks.
Distilled heavily from Claude 4.7 Opus reasoning and Claude Fable-5 agentic traces, on top of Qwen3.6-35B-A3B.

These quants were generated using an external importance matrix bartowski/lordx64_Qwable-v1-GGUF/lordx64_Qwable-v1-imatrix.gguf and manual layer targeting to maximize quality while shrinking the massive VRAM footprint of the Mixture of Experts layers.

📄 GGUF Files

In order of quality:

Filename	Size	Quants
Qwable-v1-35B-A3B-MXFP4_MOE_Q8_0_F16-Imatrix.gguf	21.3 GB	MXFP4_MOE + Q8_0 + F16
Qwable-v1-35B-A3B-MXFP4_MOE_Q8_0-Imatrix.gguf	20.3 GB	MXFP4_MOE + Q8_0

Update 2026-06-27:

MXFP4_MOE_Q8_0_F16 - ssm_alpha & ssm_beta is now F16, to lessen looping at high context.
MXFP4_MOE_Q8_0_F16 - attn_output is now Q8_0, as it was previously F16 by accident due to incorrect --tensor-type regex.

🔍 Precision Matrix & Flavor Variations

Standard global quantization presets (like stock MXFP4_MOE) compress the backbone layers uniformly, which degrades the delicate reasoning capabilities of advanced agent models.
This repository provides two distinct manual configuration layouts to balance precision and memory constraints:

1. The Tri-Quant Hybrid Flavor (`MXFP4` + `Q8_0` + `F16`)

Qwable-v1-35B-A3B-MXFP4_MOE_Q8_0_F16-Imatrix.gguf - Designed for maximum quality preservation, this layout implements a strict 3-Tier Precision Matrix:

Tier 1 (Core & Mamba Gating - F16 Precision):
- token_embd.weight, output.weight - Protects the critical input/output vocabulary mappings. Adds ~1GB to the file size but dramatically prevents text degradation.
- ssm_alpha, ssm_beta - Protects the integrity of the Mamba state-space calculations across long-range context tokens.
Tier 2 (Backbone & Shared - Q8_0 Precision): ssm_out, *._shexp - Keeps the attention mechanics, and all trailing shared experts at high quality, to protect the logical research loops.
Tier 3 (Routed Experts - MXFP4 Precision): ffn_down_exps, ffn_gate_exps, ffn_up_exps - Shrink the massive background expert parameters directly to MXFP4.

2. The Dual-Quant Hybrid Flavor (`MXFP4` + `Q8_0`)

Qwable-v1-35B-A3B-MXFP4_MOE_Q8_0-Imatrix.gguf - Designed for a slightly leaner memory profile, this layout utilizes 2-Tier Precision:

Tier 1 (Backbone - Q8_0 Precision): All attention blocks, Mamba structures, vocabulary embeddings, and internal routers use the universal Q8_0 format.
Tier 2 (Experts - MXFP4 Precision): The heavy sparse expert blocks are target-quantized directly to MXFP4.

📝 Exact Conversion Details

Because Qwable-v1 utilizes trailing shared-expert vectors at the boundary edge of its alternating architecture (Layer 40 boundary), standard conversion requires boundary bypass instructions using .*_shexp\.weight=Q8_0. These files were converted via llama-quantize utilizing the following manual recipe parameters:

Convert SafeTensors to GGUF:

# Requires python3.12, with `pip install --upgrade transformers`
python convert_hf_to_gguf.py "Qwable-v1/" --outtype f16 --outfile "Qwable-v1_F16.gguf"

Generate Tri-Quant MXFP4_MOE + Q8_0 + F16:

llama-quantize \
  --tensor-type ".*_shexp\.weight=Q8_0" \
  --tensor-type "token_embd\.weight=F16" \
  --tensor-type "^output\.weight=F16" \
  --tensor-type "blk\..*\.(ssm_alpha|ssm_beta)\.weight=F16" \
  --tensor-type "blk\..*\.(ffn_down_exps|ffn_gate_exps|ffn_up_exps)\.weight=MXFP4" \
  --imatrix "bartowski-lordx64_Qwable-v1-imatrix.gguf" \
  "Qwable-v1_F16.gguf" \
  "Qwable-v1-35B-A3B-MXFP4_MOE_Q8_0_F16-Imatrix.gguf" \
  Q8_0

Generate Dual-Quant MXFP4_MOE + Q8_0:

llama-quantize \
  --tensor-type ".*_shexp\.weight=Q8_0" \
  --tensor-type "blk\..*\.(ffn_down_exps|ffn_gate_exps|ffn_up_exps)\.weight=MXFP4" \
  --imatrix "bartowski-lordx64_Qwable-v1-imatrix.gguf" \
  "Qwable-v1_F16.gguf" \
  "Qwable-v1-35B-A3B-MXFP4_MOE_Q8_0-Imatrix.gguf" \
  Q8_0

📝 Local Deployment & `llama-server` Configuration (`config.ini`)

To maintain the rock-solid reasoning loop depth of the Fable+Opus distillation and prevent agents from falling into repetitive tool-calling deadlocks, use the following server parameter recommendations.

ini

# --- Samplers (Dynamic & Expressive) ---
temperature = 0.65
top-k = 40
top-p = 0.90
min-p = 0.08
# --- Penalties (Prevent Syntax & Reasoner Corruption) ---
repeat-penalty = 1.00
presence-penalty = 0.00
# --- DRY Sampler (Protects Indentation & Structural Boilerplate) ---
dry-multiplier = 0.8
dry-base = 1.75
dry-allowed-length = 8
dry-penalty-last-n = 1024
dry-sequence-breaker = ["\n", ":", " ", "\t", "\"", ","]
# --- Enforced Execution Graph ---
samplers = temp;top_k;top_p;min_p;dry

Keep reasoning off for this model.

ini

reasoning = off
reasoning-budget = 0
reasoning-format = none

This works well with 256k context window.

Note: If using a larger context window, ensure you use the updated MXFP4_MOE_Q8_0_F16 flavor (updated 2026-06-27) to maintain pristine Mamba state-space precision and lessen looping at high context.

ℹ️ Misc Details

I'm doing this as a side hobby, with my AMD 5900X, 64GB DDR4, RTX 3060 12GB & RTX 5060 Ti 16GB.

In addition to the above configuration, I also use:

ini

slots = 1
parallel = 1
no-warmup = true

flash-attn = on
mlock = false
no-mmap = false
no-context-shift = true

batch-size = 2048
ubatch-size = 256

fit = on
fit-target = 768
main-gpu = 0
split-mode = layer
n-gpu-layers = 999
n-cpu-moe = 0
tensor-split = 16,12
override-tensor = (token_embd)=CUDA0,(vision|vpm|nextn)=CPU

cache-type-k = q8_0
cache-type-v = q8_0

jinja = true
chat-template = jinja
chat-template-file = chat_template.jinja

For further quality and better ssm behaviour, this configuration can help:

ini

context-shift = false
cache-type-k = f16
cache-type-v = f16

🤝 Support the Journey

As a passionate developer, I'm always programming, automating, or experimenting with new ideas.
I love building open-source tools, trying out new web tech, and creating things that don't yet exist, including local AI & quantizing models.

I love sharing these creations to give back to the community.
If my projects have saved you time or helped you out, consider supporting my work below!

👉 Support me on Ko-fi

✨ Acknowledgments

lordx64 for the exceptional Qwable-v1 base model.
bartowski for the high-quality importance matrix data anchors.

📜 License

See lordx64/Qwable-v1#license--terms.

🔗 Citation

bibtex

@misc{lordx64_qwable_v1_2026,
  title  = {Qwable-v1: Agentic coding distillation from Claude Fable-5 onto Qwen3.6-35B-A3B},
  author = {lordx64},
  year   = {2026},
  howpublished = {\url{https://huggingface.co/lordx64/Qwable-v1}},
}

jashepp/Qwable-v1-35B-A3B-MXFP4_MOE_Hybrid-Imatrix-GGUF

💎 Qwable-v1-35B-A3B - Custom Mixed Precision GGUFs with Imatrix