What are the hardware requirements for Qwen3.5 397B A17B DFlash?

Qwen3.5 397B A17B DFlash requires approximately 2.6 GB of VRAM and supports a context window of 256K tokens. Quantized variants may run on less VRAM; see the Quantized Models section on this page.

Who developed Qwen3.5 397B A17B DFlash and how large is it?

Qwen3.5 397B A17B DFlash is developed by lmsys, a model with 397b parameters. The model is published as open weights on Hugging Face and indexed on LLM Explorer with full benchmark history.

Where can I download or evaluate Qwen3.5 397B A17B DFlash?

Qwen3.5 397B A17B DFlash is hosted on Hugging Face and linked from this page. LLM Explorer also lists quantized variants and similar alternatives if available.

Qwen3.5 397B A17B DFlash by lmsys — VRAM 2.6GB, 256K context

Name: Qwen3.5 397B A17B DFlash
Author: lmsys

Qwen3.5 397B A17B DFlash is an open-source language model by lmsys. Features: 397b LLM, VRAM: 2.6GB, Context: 256K, License: apache-2.0, LLM Explorer Score: 0.25.

Arxiv:2602.06036 Base model:finetune:qwen/qwen3... Base model:qwen/qwen3.5-397b-a... Block-diffusion Custom code Dflash Diffusion-language-model Draft-model Efficiency Feature-extraction Qwen Qwen3 Qwen3.5 Region:us Safetensors Sglang Speculative-decoding Speculative-decoding-draft

Model Card on HF 🤗: https://huggingface.co/lmsys/Qwen3.5-397B-A17B-DFlash

Qwen3.5 397B A17B DFlash Parameters and Internals

LLM Name	Qwen3.5 397B A17B DFlash
Repository 🤗	https://huggingface.co/lmsys/Qwen3.5-397B-A17B-DFlash
Base Model(s)	Qwen/Qwen3.5-397B-A17B Qwen/Qwen3.5-397B-A17B
Model Size	397b
Required VRAM	2.6 GB
Updated	2026-08-10
Maintainer	lmsys
Model Type	qwen3
Model Files	2.6 GB
Model Architecture	DFlashDraftModel
License	apache-2.0
Context Length	262144
Model Max Length	262144
Transformers Version	5.7.0
Vocabulary Size	248320

Rank the Qwen3.5 397B A17B DFlash capabilities

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Instruction Following and Task Automation
Factuality and Completeness of Knowledge
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Data Analysis and Insight Generation
Text Generation
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Multi-Language Support and Translation

Best Alternatives to Qwen3.5 397B A17B DFlash

Best Alternatives	Context / RAM	Downloads	Likes
Qwen3.5 397B A17B DFlash	256K / 2.6 GB	6020	10

Note: green Score (e.g. "73.2") means that the model is better than lmsys/Qwen3.5-397B-A17B-DFlash.