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---
base_model: ukisai/Swift-Qwen3.8-27b
library_name: transformers
license: other
license_name: swift-open-license-1.0
pipeline_tag: image-text-to-text
tags:
- qwen3_8
- efficient-thinking
- reasoning
- token-efficient
- amd
- rocm
- int4
- awq
- quark
- w4a16
base_model_relation: quantized
---
<div align="center">
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<div style="display:flex;justify-content:center;gap:0.6em;margin-bottom:1em;">
<a href="https://ukisai.com"><strong>Website</strong></a> &nbsp;&bull;&nbsp;
<a href="https://ukisai.com/products/swift"><strong>Learn more</strong></a> &nbsp;&bull;&nbsp;
<a href="https://huggingface.co/ukisai/Swift-Qwen3.8-27B-GGUF"><strong>GGUF</strong></a> &nbsp;&bull;&nbsp;
<a href="#license-and-access"><strong>Enterprise licensing</strong></a>
</div>
</div>
# Swift-Qwen3.8-27b-int4-AMD
AMD Quark AWQ INT4 (W4A16) edition of Swift. The following introduction describes the base Swift results; release-specific details are below.
Swift-Qwen3.8-27B is UkisAI's reasoning-efficient derivative of Qwen3.8-27B,
using **58.3% fewer thinking tokens** while maintaining near-identical performance
(**&lt;1% loss**) and as a result getting a **x1.95 speed-up** on several tasks.
<video controls autoplay muted loop playsinline style="width:100%;max-width:100%;height:auto;display:block;border-radius:12px;margin:0.8em 0 1.4em;" src="https://huggingface.co/ukisai/Swift-Qwen3.8-27b-int4-AMD/resolve/main/swift-speed-demo.mp4"></video>
<p align="center" style="font-size:13px;color:#8C94A8;margin:-0.6em 0 1.4em;">The prompt is a sample from LiveCodeBench v6</p>
## AMD Quark INT4 release
This is the **INT4 W4A16 quantization of Swift for AMD hardware workflows**, produced
with [AMD Quark](https://github.com/amd/Quark). It uses Quark's **PyTorch** workflow
and native Hugging Face safetensors export: signed symmetric INT4 weights,
groups of 128, and BF16 activations.
The full-precision companion is
[Swift-Qwen3.8-27b-BF16-AMD](https://huggingface.co/ukisai/Swift-Qwen3.8-27b-BF16-AMD).
| Property | This checkpoint |
| --- | --- |
| Source | [Swift-Qwen3.8-27B](https://huggingface.co/ukisai/Swift-Qwen3.8-27b) |
| Quantizer | AMD Quark AWQ |
| Weight / activation precision | INT4 / BF16 (W4A16) |
| Weight grouping | Symmetric, group size 128 |
| Format | Native Quark safetensors, `real_quantized`, `reorder` packing |
| Weight files | 19.513 GB; BF16 source: 55.563 GB |
| Calibration | 128 Pile validation samples, 512 tokens each |
| Quantized layers | 496 eligible language-model linear layers |
| Preserved components | BF16 vision tower, output head, embeddings, and all 15 MTP tensors |
Quark supports preparing models for AMD deployment. **This checkpoint was quantized
and validated on an NVIDIA H100; AMD/ROCm serving and throughput have not yet been
validated.** Serving needs a runtime that supports this native Quark INT4 format.
The [Quark project](https://github.com/amd/Quark) and
[installation guide](https://quark.docs.amd.com/latest/install.html) describe its
supported CUDA and ROCm environments.
### Checkpoint validation
| Sanity check | BF16 | This INT4 export |
| --- | ---: | ---: |
| Wikitext perplexity | 9.16197 | 9.54254 |
| Arithmetic generation | Pass | Pass |
| JSON generation | Pass | Pass |
Perplexity uses the same eight non-overlapping 512-token Wikitext-2 test windows.
The 4.15% perplexity increase is a small sanity result, not a full accuracy benchmark.
The packed checkpoint was independently reloaded, including its final configuration
and index, and reproduced the evaluation NLLs exactly. All floating tensors are
finite; 349 preserved vision/output-head/MTP tensors match the source exactly.
Vision inference and MTP decoding were not exercised in this validation.
See [quantization_report.json](quantization_report.json).
**The Swift benchmarks and speed demonstration below are reproduced from the base
Swift model card. They do not measure this Quark export or AMD hardware.**
## Training approach
We built Swift by identifying reasoning-marker tokens that, in our analysis, trigger overthinking in Qwen’s
reasoning rollouts. We then fine-tuned Qwen by penalizing usage of those tokens while it reasons.
Swift produces shorter reasoning traces. In our testing, we also observe fewer overthinking errors.
For maximum gains, Swift also includes a transfer component derived from
[BottleCap AI's ThinkingCap-Qwen3.6-27B](https://huggingface.co/bottlecapai/ThinkingCap-Qwen3.6-27B).
## Evaluation scope
> All results below compare the Qwen3.8-27B BF16 base with the same base plus the
> Swift adapter.
## Benchmarks
<style>
.swift-table { width:100%; table-layout:fixed; border-collapse:separate; border-spacing:0; overflow:hidden; border:1px solid #27344A; border-radius:20px; background:#0D111B; font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif; font-size:14px; color:#BFBDBD; }
.swift-table th { padding:13px 8px; text-align:center; font-weight:700; color:#AEB5C7; background:#0D111B; border-right:1px solid #27344A; border-bottom:1px solid #27344A; }
.swift-table td { padding:14px 8px; text-align:center; color:#BFBDBD; background:#0D111B; border-right:1px solid #27344A; border-bottom:1px solid #27344A; vertical-align:middle; overflow-wrap:break-word; }
.swift-table tr > :last-child { border-right:0; }
.swift-table tbody tr:last-child td { border-bottom:0; }
.swift-table .benchmark-heading { color:#B7BDCD; background:#0D111B; border-bottom:3px solid #7D45B5; }
.swift-table .score-heading { color:#F0C5FF; background:#52239E; border-bottom:3px solid #7D45B5; }
.swift-table .tokens-heading, .swift-table .median-heading { color:#D4E8FF; background:#304FC2; border-bottom:3px solid #5687E6; }
.swift-table .benchmark { padding-left:18px; text-align:left; color:#FFFFFF; font-weight:600; }
.swift-table strong { color:#FFFFFF; }
.swift-table .section { padding:12px 18px; text-align:left; color:#B489FF; background:#2A2541; font-weight:700; letter-spacing:.08em; text-transform:uppercase; border-top:1px solid #3A3159; border-bottom:1px solid #3A3159; }
.swift-table .swift { background:#171127; }
.swift-table thead tr:nth-child(2) .swift { color:#D3A0FF; }
.swift-table .reduction { color:#69BFFF; background:#101B2C; font-weight:700; }
.swift-table .detail { color:#8C94A8; font-size:12px; font-weight:500; }
@media (max-width: 640px) {
.swift-table { display:block !important; width:100% !important; max-width:100%; overflow-x:auto !important; -webkit-overflow-scrolling:touch; table-layout:auto !important; }
.swift-table th, .swift-table td { min-width:100px; }
.swift-table th:first-child, .swift-table td:first-child { min-width:160px; }
}
</style>
<table class="swift-table">
<thead>
<tr>
<th rowspan="2" class="benchmark-heading" style="width:32%;text-align:left;padding-left:18px;vertical-align:bottom;">Benchmark</th>
<th colspan="2" class="score-heading">Score</th>
<th colspan="3" class="tokens-heading">Mean tokens</th>
<th class="median-heading" style="width:14%;">Median tokens</th>
</tr>
<tr>
<th>Base</th>
<th class="swift">Swift</th>
<th>Base</th>
<th class="swift">Swift</th>
<th class="reduction">Reduction</th>
<th class="reduction">Reduction</th>
</tr>
</thead>
<tbody>
<tr><td class="section" colspan="7">General reasoning</td></tr>
<tr><td class="benchmark">GPQA-Diamond</td><td>88.38%</td><td class="swift">88.28%</td><td>15,014</td><td class="swift"><strong>8,855</strong></td><td class="reduction">&darr; 41.0%</td><td class="reduction">&darr; 58.3%</td></tr>
<tr><td class="benchmark">MMLU-Pro</td><td>85.47%</td><td class="swift">84.95%</td><td>2,980</td><td class="swift"><strong>1,603</strong></td><td class="reduction">&darr; 46.2%</td><td class="reduction">&darr; 28.3%</td></tr>
<tr><td class="benchmark">C-Eval</td><td>90.00%</td><td class="swift">90.62%</td><td>1,492</td><td class="swift"><strong>804</strong></td><td class="reduction">&darr; 46.1%</td><td class="reduction">&darr; 19.3%</td></tr>
<tr><td class="benchmark">IFBench</td><td>73.53%</td><td class="swift">71.80%</td><td>8,052</td><td class="swift"><strong>4,657</strong></td><td class="reduction">&darr; 42.2%</td><td class="reduction">&darr; 50.5%</td></tr>
<tr><td class="section" colspan="7">Mathematics</td></tr>
<tr><td class="benchmark">AIME 2026</td><td>98.67%</td><td class="swift">94.00%</td><td>22,014</td><td class="swift"><strong>16,143</strong></td><td class="reduction">&darr; 26.7%</td><td class="reduction">&darr; 50.2%</td></tr>
<tr><td class="benchmark">HMMT (Nov 2025)</td><td>99.33%</td><td class="swift">96.00%</td><td>22,032</td><td class="swift"><strong>15,189</strong></td><td class="reduction">&darr; 31.1%</td><td class="reduction">&darr; 45.9%</td></tr>
<tr><td class="section" colspan="7">Multimodal</td></tr>
<tr><td class="benchmark">ERQA</td><td>67.45%</td><td class="swift">66.30%</td><td>4,137</td><td class="swift"><strong>2,045</strong></td><td class="reduction">&darr; 50.6%</td><td class="reduction">&darr; 54.6%</td></tr>
<tr><td class="section" colspan="7">Agentic coding</td></tr>
<tr><td class="benchmark">Terminal-Bench 2.1</td><td>66.74%</td><td class="swift">65.84%</td><td>37,086</td><td class="swift"><strong>27,272</strong></td><td class="reduction">&darr; 26.5%</td><td class="reduction">&darr; 38.7%</td></tr>
<tr><td class="benchmark">LiveCodeBench v6</td><td>76.76%</td><td class="swift">81.55%</td><td>11,374</td><td class="swift"><strong>8,615</strong></td><td class="reduction">&darr; 24.3%</td><td class="reduction">&darr; 45.8%</td></tr>
</tbody>
</table>
<details>
<summary><strong>How to reproduce</strong></summary>
<p style="font-size:13px;line-height:1.5;margin:8px 0;"><strong>Serving:</strong> BF16 · vLLM 0.27.1 · Qwen3 parser · context 262,144 · thinking xhigh.<br>
<strong>Sampling:</strong> temperature 1.0 · top_p 0.95 · top_k 20 · min_p 0 · presence_penalty 0 · repetition_penalty 1.<br>
<strong>Benchmarks:</strong> averages over five seeds (0–4) per model; five trials per task for Terminal-Bench.</p>
<table style="display:table;width:100%;border-collapse:collapse;font-size:13px;line-height:1.3;margin:8px 0;">
<thead><tr><th style="padding:4px 8px;text-align:left;">Benchmark</th><th style="padding:4px 8px;text-align:right;">Output cap</th></tr></thead>
<tbody>
<tr><td style="padding:3px 8px;">GPQA-Diamond</td><td style="padding:3px 8px;text-align:right;">100,000</td></tr>
<tr><td style="padding:3px 8px;">MMLU-Pro</td><td style="padding:3px 8px;text-align:right;">100,000</td></tr>
<tr><td style="padding:3px 8px;">C-Eval</td><td style="padding:3px 8px;text-align:right;">16,384</td></tr>
<tr><td style="padding:3px 8px;">IFBench</td><td style="padding:3px 8px;text-align:right;">81,920</td></tr>
<tr><td style="padding:3px 8px;">AIME 2026</td><td style="padding:3px 8px;text-align:right;">250,000</td></tr>
<tr><td style="padding:3px 8px;">HMMT Nov 2025</td><td style="padding:3px 8px;text-align:right;">250,000</td></tr>
<tr><td style="padding:3px 8px;">ERQA</td><td style="padding:3px 8px;text-align:right;">100,000</td></tr>
<tr><td style="padding:3px 8px;">Terminal-Bench 2.1</td><td style="padding:3px 8px;text-align:right;">Agent/task limits</td></tr>
<tr><td style="padding:3px 8px;">LiveCodeBench v6</td><td style="padding:3px 8px;text-align:right;">32,768</td></tr>
</tbody>
</table>
</details>
## Efficiency across and versus reasoning efforts
Qwen3.8's `reasoning_effort` setting lets users choose how much the model thinks.
For Swift to be useful across these settings, it needs to reduce thinking while
keeping accuracy close to the base. We therefore tested `xhigh`, `medium`, and `low`:
thinking-token savings persist at every level.
<table class="swift-table" style="display:table;width:100%;table-layout:fixed;">
<thead>
<tr>
<th class="benchmark-heading" style="width:50%;text-align:left;padding-left:18px;white-space:normal;">Reasoning effort</th>
<th class="tokens-heading" style="width:50%;white-space:normal;">Mean thinking reduction</th>
</tr>
</thead>
<tbody>
<tr><td class="benchmark">Xhigh</td><td class="reduction">&darr; 41.0%</td></tr>
<tr><td class="benchmark">Medium</td><td class="reduction">&darr; 22.7%</td></tr>
<tr><td class="benchmark">Low</td><td class="reduction">&darr; 25.8%</td></tr>
</tbody>
</table>
The efficiency also holds up against the base's own lower effort settings. On
GPQA-Diamond (198 questions, 5 seeds, 990 paired calls), Swift at `xhigh` is
compared with the base at `xhigh` and at `medium`:
<table class="swift-table" style="display:table;width:100%;table-layout:fixed;">
<thead>
<tr>
<th class="benchmark-heading" style="width:34%;text-align:left;padding-left:18px;white-space:normal;">GPQA-Diamond</th>
<th class="score-heading" style="width:22%;white-space:normal;">Score</th>
<th class="tokens-heading" style="width:22%;white-space:normal;">Mean tokens</th>
<th class="median-heading" style="width:22%;white-space:normal;">Median tokens</th>
</tr>
</thead>
<tbody>
<tr><td class="benchmark">Base &middot; xhigh</td><td>88.38%</td><td>15,014</td><td>6,642</td></tr>
<tr class="swift"><td class="benchmark swift">Swift &middot; xhigh</td><td class="swift"><strong>88.28%</strong></td><td class="swift"><strong>8,855</strong></td><td class="swift"><strong>2,771</strong></td></tr>
<tr><td class="benchmark">Base &middot; medium</td><td>84.14%</td><td>4,451</td><td>1,753</td></tr>
</tbody>
</table>
Swift retains the accuracy of `xhigh` while using about half the tokens, although
it uses about double the tokens of `medium`.
## Quantized models
Quantized deployment is the intended use for Swift: lower-memory weights paired with
shorter reasoning. The INT4 evaluations below retain token savings across GPQA,
IFBench, and AIME. On AIME, Swift matches or improves accuracy and reduces output-cap
failures by **31–33%**.
<table class="swift-table" style="display:table;width:100%;table-layout:fixed;">
<thead><tr>
<th class="benchmark-heading" style="width:32%;text-align:left;padding-left:18px;white-space:normal;">Benchmark / quantization</th>
<th class="score-heading" style="width:16%;white-space:normal;">Base accuracy</th>
<th class="score-heading" style="width:16%;white-space:normal;">Swift accuracy</th>
<th class="tokens-heading" style="width:18%;white-space:normal;">Mean token reduction</th>
<th class="median-heading" style="width:18%;white-space:normal;">Median token reduction</th>
</tr></thead>
<tbody>
<tr><td class="benchmark">GPQA-Diamond<br><span class="detail">Mixed-precision quant W4A16 · thinking tokens</span></td><td>88.69%</td><td class="swift">88.38%</td><td class="reduction">&darr; 32.1%</td><td class="reduction">&darr; 50.2%</td></tr>
<tr><td class="benchmark">IFBench<br><span class="detail">Mixed-precision quant W4A16 · completion tokens</span></td><td>72.58%</td><td class="swift">71.25%</td><td class="reduction">&darr; 30.1%</td><td class="reduction">&darr; 38.0%</td></tr>
<tr><td class="benchmark">AIME 2026<br><span class="detail">Mixed-precision quant W4A16 · completion tokens</span></td><td>84.00%</td><td class="swift">84.00%</td><td class="reduction">&darr; 19.0%</td><td class="reduction">&darr; 37.5%</td></tr>
<tr><td class="benchmark">AIME 2026<br><span class="detail">AWQ INT4 · completion tokens</span></td><td>82.67%</td><td class="swift">84.00%</td><td class="reduction">&darr; 22.8%</td><td class="reduction">&darr; 34.8%</td></tr>
</tbody>
</table>
<details>
<summary><strong>Quantized evaluation settings</strong></summary>
Each row compares the same quantized base with and without the Swift adapter.
GPQA and AIME use five seeds; IFBench uses four samples per prompt and strict scoring.
Output caps: GPQA 100,000; IFBench 81,920; AIME 32,768. GPQA and IFBench use saved
historical base runs. AIME uses template-default effort and counts truncated answers
as incorrect. Its shorter cap makes it a separate comparison from the BF16 table.
</details>
## How to use
### PyTorch with AMD Quark
Install the GPU-specific PyTorch and Quark packages from the
[official installation guide](https://quark.docs.amd.com/latest/install.html).
Validation used Python 3.12, PyTorch 2.11.0+cu128, Transformers 5.2.0,
AMD Quark 0.12.post1+cu128.torch2.11, Accelerate 1.15.0, and Safetensors 0.8.0.
For AMD, select the corresponding supported ROCm environment.
Download this repository and run the included loader:
```bash
hf download ukisai/Swift-Qwen3.8-27b-int4-AMD --local-dir Swift-Qwen3.8-27b-int4-AMD
python Swift-Qwen3.8-27b-int4-AMD/load_quark.py \
--model Swift-Qwen3.8-27b-int4-AMD \
--prompt "What is 17 multiplied by 23? Answer with only the number."
```
[`load_quark.py`](load_quark.py) imports the packed weights through Quark's PyTorch
API. The included [`quark_compat.py`](quark_compat.py) handles the public Quark
0.12 dense-Qwen reload path. The model uses the `qwen3_5` Transformers architecture
identifier. [`recipe.py`](recipe.py) records the AWQ configuration.
The example disables thinking for a short deterministic smoke check.
### Serving
A serving engine must support native Quark W4A16 signed INT4 with `reorder` packing
and this Qwen architecture. As of September 14, 2026,
[vLLM's native Quark INT4 support PR](https://github.com/vllm-project/vllm/pull/48606)
remains open. Stock vLLM compatibility and AMD performance are not established by
the PyTorch validation above. The preserved MTP head also needs compatible runtime
support before speculative decoding can be used.
For standard BF16 serving instructions, see the
[BF16 companion](https://huggingface.co/ukisai/Swift-Qwen3.8-27b-BF16-AMD).
The [base Swift card](https://huggingface.co/ukisai/Swift-Qwen3.8-27b#how-to-use) also documents the
UkisAI API and other Swift formats; that API is separate from this downloadable
Quark checkpoint.
## License and access
Swift weights are distributed under the **Swift Open License v1.0**.
Personal, research, educational, evaluation, and commercial use are free for individuals
and organizations with annual recurring revenue, including affiliates, of up to
US$1,000,000. Above that threshold, commercial use requires a separate **Swift Enterprise
License**. Contact [UkisAI](https://ukisai.com/contact) for terms.
## Citation
```bibtex
@misc{swift-qwen3.8-27b,
title = {Swift-Qwen3.8-27B},
author = {UkisAI},
year = {2026},
url = {https://huggingface.co/ukisai/Swift-Qwen3.8-27b}
}
```
## Acknowledgements
We acknowledge the [NVIDIA Innovation Lab](https://www.nvidia.com/en-us/data-center/innovation-lab/) for providing access to **8× NVIDIA H100 GPUs** to train Swift.