Swift-Qwen3.8-27B UD-Q4_K_XL GGUF

A custom mixed-precision GGUF quantization of ukisai/Swift-Qwen3.8-27b.

This build combines:

  • Swift-Qwen3.8-27B fine-tuned weights from UkisAI
  • Bartowski's Swift-specific importance matrix
  • the UD-Q4_K_XL per-tensor quantization layout derived from Unsloth's Qwen3.8-27B dynamic quantization recipe

The goal was to retain roughly Q4-class model size and memory bandwidth requirements while selectively preserving sensitive tensors at substantially higher precision.

Model file

File Size
Swift-Qwen3.8-27B-UD-Q4_K_XL.gguf 17,559,177,376 bytes
Approximate binary size 16.35 GiB
Quantizer-reported average 5.14 BPW

Tensor distribution

Quantization type Tensor count
Q5_K 191
Q8_0 110
IQ4_XS 70
Q4_K 69
Q6_K 56
IQ4_NL 6
Q3_K 3
IQ3_S 1
Total quantized tensors 506

The source GGUF also contains 360 F32 tensors, which remain F32.

The exact per-tensor assignment is included as:

tensor_types_UD-Q4_K_XL.txt

Importance matrix

This build used:

ukisai_Swift-Qwen3.8-27b-imatrix.gguf

from:

bartowski/ukisai_Swift-Qwen3.8-27b-GGUF

The quantizer reported 496 importance-matrix entries computed from 582 calibration chunks.

The imatrix itself is not redistributed here.

So this build is:

Swift-Qwen3.8-27B weights
+ Bartowski Swift-specific imatrix
+ Unsloth UD-Q4_K_XL tensor allocation
= this quant

Quantization details

Source model:

ukisai/Swift-Qwen3.8-27b

Observed source GGUF properties:

Architecture:     qwen35
Blocks:           65
Context length:   262144
Embedding size:   5120
FFN size:         17408
Total tensors:    866
F32 tensors:      360
BF16 tensors:     506

Quantized with llama.cpp:

build:  10990
commit: 72b590d65

Reproduction

llama-quantize \
  --imatrix ukisai_Swift-Qwen3.8-27b-imatrix.gguf \
  --tensor-type-file tensor_types_UD-Q4_K_XL.txt \
  Swift-Qwen3.8-27B-BF16.gguf \
  Swift-Qwen3.8-27B-UD-Q4_K_XL.gguf \
  Q4_K_M

All 506 BF16 tensors are explicitly assigned by tensor_types_UD-Q4_K_XL.txt, so the output uses the mixed UD-Q4_K_XL allocation rather than ordinary Q4_K_M tensor selection.

Validation

The GGUF has been tested successfully with llama.cpp for:

  • normal chat
  • coding
  • OpenCode
  • tool calling
  • multi-file coding-agent workflows
  • structured code edits

It has behaved well in practical OpenCode use so far.

This is not a claim of benchmark equivalence to BF16, Q5_K_M, or Q6_K.

llama.cpp usage

llama-cli \
  -m Swift-Qwen3.8-27B-UD-Q4_K_XL.gguf \
  -cnv

Server example:

llama-server \
  -m Swift-Qwen3.8-27B-UD-Q4_K_XL.gguf \
  --host 0.0.0.0 \
  --port 8080

Multimodal / vision use

This repository contains the language-model GGUF only.

A compatible Qwen3.8-27B multimodal projector (mmproj) is required for image input and is not included here.

Checksums

SHA-256 hashes are provided in SHA256SUMS.

Verify them with:

sha256sum -c SHA256SUMS

Credits

Swift model

ukisai/Swift-Qwen3.8-27b

Base model

Qwen/Qwen3.8-27B

Swift importance matrix

bartowski/ukisai_Swift-Qwen3.8-27b-GGUF

UD-Q4_K_XL allocation

The tensor allocation is based on Unsloth's UD-Q4_K_XL layout for Qwen3.8-27B.

The tensor map used to reproduce that allocation was obtained through:

ajgazin/Qwen3.8-27B-Heretic-Dynamic-GGUF

License

This repository contains a quantized derivative of ukisai/Swift-Qwen3.8-27b.

The Swift fine-tuned weights are distributed under the Swift Open License v1.0. Review the original Swift model repository and license before redistribution or commercial use.

Disclaimer

This is an independently produced community quantization and is not an official UkisAI, Qwen, Bartowski, or Unsloth release.

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