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Open-weight model · Text generation

Qwen2.5-1.5B

by Qwen Qwen/Qwen2.5-1.5B

Qwen2.5 is the latest series of Qwen large language models. For Qwen2.5, we release a number of base language models and instruction-tuned language models ranging from 0.5 to 72 billion parameters.

Parameters1.5B
Context131,072
Weights3.1 GB
Licenseapache-2.0
AccessOpen weights
Monthly Downloads880.3k

Runs On

What it takes to serve Qwen2.5-1.5B (1.5B 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 3.1 GB 3.7 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
8-bit 1.5 GB 1.9 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
4-bit 0.8 GB 0.9 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 Sep 18, 2026.

SAVRN's Notes on Qwen2.5-1.5B

Three point seven gigabytes. That is what a 16-bit copy of Qwen2.5-1.5B needs, and the cheapest slot we price it on is one 192 GB MI300X at $1.85 an hour. The weights take about two percent of that card, so the question is not whether it fits but how many copies, or how much context, you pack beside it. At 8-bit the need is 1.9 GB, at 4-bit 0.9 GB, and the 131,072-token context is where the rest of the memory goes.

Apache 2.0 permits commercial use, so you can fine-tune it and ship it inside a product, provided the license notices travel with it and you state significant changes. Confirm your serving stack honors the full 131,072 tokens, and read the technical report at arXiv:2407.10671. The SAVRN Index has no host prices for it yet, so your per-token cost comes from your own hourly rate.

Model Card

By Qwen, published under apache-2.0, revision 8faed761d45a.

Introduction

Qwen2.5 is the latest series of Qwen large language models. For Qwen2.5, we release a number of base language models and instruction-tuned language models ranging from 0.5 to 72 billion parameters. Qwen2.5 brings the following improvements upon Qwen2:

  • Significantly more knowledge and has greatly improved capabilities in coding and mathematics, thanks to our specialized expert models in these domains.
  • Significant improvements in instruction following, generating long texts (over 8K tokens), understanding structured data (e.g, tables), and generating structured outputs especially JSON. More resilient to the diversity of system prompts, enhancing role-play implementation and condition-setting for chatbots.
  • Long-context Support up to 128K tokens and can generate up to 8K tokens.
  • Multilingual support for over 29 languages, including Chinese, English, French, Spanish, Portuguese, German, Italian, Russian, Japanese, Korean, Vietnamese, Thai, Arabic, and more.

Read the full model card (528 words)

Configuration

Architecture
Qwen2ForCausalLM
Context length (tokens)
131,072
Layers
28
Hidden size
1,536
Feed-forward size
8,960
Attention heads
12
Key/value heads
2
Vocabulary size
151,936
Sliding window (tokens)
131,072
RoPE base
1e+06
Stored precision
bfloat16
Model type
qwen2

Identity and Version

Repository
Qwen/Qwen2.5-1.5B
Publisher
Qwen
Task
Text generation
Modality
Text
Library
transformers
Parameters
1.5B parameters
Languages
en
Revision
8faed761d45a263340a0528343f099c05c9a4323
First published
2024-09-15
Last updated
2024-10-08

Files and Weights

10 files, 3.1 GB in total. The weights are 1 file totalling 3.1 GB in safetensors.

Weights1 file · 3.1 GB
Configuration2 files · 822 B
Tokenizer4 files · 11.5 MB
Documentation2 files · 15.2 KB
Repository1 file · 1.5 KB
Every file
FileTypeSizeSHA-256
model.safetensorsWeights3.1 GB a961db72e75d
config.jsonConfiguration684 B
generation_config.jsonConfiguration138 B
LICENSEDocumentation11.3 KB
README.mdDocumentation3.9 KB
.gitattributesRepository1.5 KB
merges.txtTokenizer1.7 MB
tokenizer.jsonTokenizer7.0 MB
tokenizer_config.jsonTokenizer7.2 KB
vocab.jsonTokenizer2.8 MB

License and Download

License
apache-2.0
Access
Open weights, no gate
Download size
3.1 GB
Download from Qwen

Released by Qwen through ModelScope. Read the license.

Built From

Evaluations

Each result is shown as reported, with the conditions its reporter stated. None is a SAVRN measurement. A comparison lines two results up only when their configuration, unit and setup are all stated and identical.

BenchmarkConditionsResultReported byRevisionDate
TIGER-Lab/MMLU-Pro Task mmlu_proMetric mmlu_proComparison conditions not established 32.1 EvalEval
Reported by a third party
Evaluated revision not stated 2026-06-30

Memory Requirements

PrecisionWeights in memory
As published3.1 GB
16-bit3.1 GB
8-bit1.5 GB
4-bit0.8 GB

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

Built on This Model

Compare Qwen2.5-1.5B

Questions About Qwen2.5-1.5B

How much GPU memory does Qwen2.5-1.5B need?

About 3.7 GB at 16-bit and 0.9 GB at 4-bit: the weights (1.5B parameters) plus a working margin. A long context needs more.

What is the cheapest GPU to run Qwen2.5-1.5B 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.

Can I use Qwen2.5-1.5B commercially?

Yes. Qwen2.5-1.5B is released under Apache License 2.0. The Apache License 2.0 is a permissive open-source license. It permits commercial use, modification and redistribution. It requires keeping the license and copyright notices and any NOTICE file, stating significant changes, and it includes an express patent grant from contributors.

What is Qwen2.5-1.5B's context length?

131,072 tokens, from the maximum position embeddings in its published configuration.

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