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Open-weight model · Text generation

Swift-1.5-Qwen3.8-27B-MXFP4-GPTQ

by SlyBase slybase/Swift-1.5-Qwen3.8-27B-MXFP4-GPTQ

Swift-1.5-Qwen3.8-27B-MXFP4-GPTQ is an open-weight model for text generation from SlyBase, released under other. It has 27.8B parameters and a 262,144-token context. At 16-bit it needs about 66.7 GB of GPU memory, which fits on 1x MI300X from $1.85 an hour, at the lowest prices in the SAVRN Index.

quantised to OCP MXFP4 (fp4e2m1 weights, e8m0 scales, group size 32) with GPTQ, in the compressed-tensors mxfp4-pack-quantized format. Weight-only: activations stay in 16-bit.

Parameters27.8B
Context262,144
Weights19.8 GB
Licenseother
AccessOpen weights
Monthly Downloads—

Runs On

What it takes to serve Swift-1.5-Qwen3.8-27B-MXFP4-GPTQ (27.8B parameters): the memory its weights need at each precision, and the cheapest way to rent enough data-center GPUs to hold them.

PrecisionWeightsMemory neededCheapest setupPer hourAlso fits
16-bit 55.6 GB 66.7 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
8-bit 27.8 GB 33.3 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
4-bit 13.9 GB 16.7 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00

Memory is the weights at that precision plus 20% for the runtime and a short context; a long context needs more. Prices are the lowest on-demand hourly rates in the SAVRN Index, read Oct 22, 2026.

Swift-1.5-Qwen3.8-27B-MXFP4-GPTQ on every accelerator the SAVRN Index prices, at every precision

Model Card

quantised to OCP MXFP4 (fp4e2m1 weights, e8m0 scales, group size 32) with GPTQ, in the compressed-tensors mxfp4-pack-quantized format. Weight-only: activations stay in 16-bit. This is the source checkpoint of the Radiance container and the checkpoint the vllm-sly-radiance image is benchmarked with (together with the DFlash2 drafter syvai/Qwen3.8-27B-DFlash2-W4A16). 1. Qwen/Qwen3.8-27B (Apache-2.0) 2. ukisai/Swift-1.5-Qwen3.8-27b (Swift Open License v1.0) 3. akumaburn/Swift-1.5-Qwen3.8-27b-heretic (abliterated, BF16) 4. This checkpoint: llm-compressor GPTQModifier, scheme MXFP4A16, static act-order, sequential pipeline, 89 calibration samples, max sequence length 2048 (recipe.yaml) The…

Excerpt from the card by SlyBase, licensed other.

Configuration

Architecture
Qwen3_5ForConditionalGeneration
Context length (tokens)
262,144
Layers
64
Hidden size
5,120
Feed-forward size
17,408
Attention heads
24
Key/value heads
4
Head dimension
256
Vocabulary size
248,320
Model type
qwen3_5
Quantization
compressed-tensors

Identity and Version

Repository
slybase/Swift-1.5-Qwen3.8-27B-MXFP4-GPTQ
Publisher
SlyBase
Task
Text generation
Modality
Text
Library
transformers
Parameters
27.8B parameters
Languages
Not stated by the source
Revision
4f4a5ced991ffa52bf6862d7183ecccb41e8f552
First published
2026-10-08
Last updated
2026-10-08

Files and Weights

24 files, 19.8 GB in total. The weights are 10 files totalling 19.8 GB in safetensors.

Weights10 files · 19.8 GB
Configuration6 files · 178.3 KB
Tokenizer2 files · 20.0 MB
Documentation4 files · 30.2 KB
Other1 file · 9.0 KB
Repository1 file · 1.6 KB
Every file
FileTypeSizeSHA-256
model-00001-of-00009.safetensorsWeights2.5 GB cec21a535170
model-00002-of-00009.safetensorsWeights2.0 GB 7de6ea726d02
model-00003-of-00009.safetensorsWeights2.0 GB ccb5320def60
model-00004-of-00009.safetensorsWeights2.0 GB a2423923c8dc
model-00005-of-00009.safetensorsWeights2.0 GB a8c7741b16ea
model-00006-of-00009.safetensorsWeights2.0 GB efeca6630002
model-00007-of-00009.safetensorsWeights2.0 GB d68fef187677
model-00008-of-00009.safetensorsWeights2.5 GB a24be664519c
model-00009-of-00009.safetensorsWeights2.0 GB 5c9fca7d4e33
model_mtp.safetensorsWeights849.4 MB 1d8268aa85ac
config.jsonConfiguration9.5 KB —
generation_config.jsonConfiguration213 B —
model.safetensors.index.jsonConfiguration167.6 KB —
preprocessor_config.jsonConfiguration390 B —
recipe.yamlConfiguration251 B —
video_preprocessor_config.jsonConfiguration385 B —
LICENSEDocumentation13.3 KB —
LICENSE-APACHE-2.0Documentation11.5 KB —
NOTICEDocumentation2.0 KB —
README.mdDocumentation3.3 KB —
chat_template.jinjaOther9.0 KB —
.gitattributesRepository1.6 KB —
tokenizer.jsonTokenizer20.0 MB 06b9509352d2
tokenizer_config.jsonTokenizer1.2 KB —

License and Download

License
other
Access
Open weights, no gate
Download size
19.8 GB
Download from SlyBase

Released by SlyBase through its official repository on Hugging Face. Read the license.

Built From

Memory Requirements

PrecisionWeights in memory
As published19.8 GB
16-bit55.6 GB
8-bit27.8 GB
4-bit13.9 GB

Weights only, from the published parameter count; the key-value cache and runtime add to this.

Questions About Swift-1.5-Qwen3.8-27B-MXFP4-GPTQ

How much GPU memory does Swift-1.5-Qwen3.8-27B-MXFP4-GPTQ need?

About 66.7 GB at 16-bit and 16.7 GB at 4-bit: the weights (27.8B parameters) plus a working margin. A long context needs more.

What is the cheapest GPU to run Swift-1.5-Qwen3.8-27B-MXFP4-GPTQ on?

At 16-bit, 1x MI300X from $1.85 an hour; at 4-bit, 1x MI300X from $1.85 an hour, at the lowest on-demand prices the SAVRN Index lists.

What license is Swift-1.5-Qwen3.8-27B-MXFP4-GPTQ released under?

other, as its publisher declares it. Read the license text before commercial use.

What is Swift-1.5-Qwen3.8-27B-MXFP4-GPTQ's context length?

262,144 tokens, from the maximum position embeddings in its published configuration.

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