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Open-weight model · Image and text to text

Rex-Omni

by IDEA-Research IDEA-Research/Rex-Omni

This model is Rex-Omni, a 3B-parameter Multimodal Large Language Model (MLLM) presented in the paper "Detect Anything via Next Point Prediction". It is compatible with the Hugging Face transformers library and is licensed under the IDEA License 1.0.

Parameters4.1B
Context128,000
Weights8.1 GB
Licenseother
AccessOpen weights
Monthly Downloads7.2k

Runs On

What it takes to serve Rex-Omni (4.1B 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 8.1 GB 9.8 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
8-bit 4.1 GB 4.9 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
4-bit 2.0 GB 2.4 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.

Model Card

This model is Rex-Omni, a 3B-parameter Multimodal Large Language Model (MLLM) presented in the paper "Detect Anything via Next Point Prediction". It is compatible with the Hugging Face transformers library and is licensed under the IDEA License 1.0. src="https://img.shields.io/badge/RexOmni-Website-BADFDB?style=flat-square&logo=deno&logoColor=violet&color=BADFDB" alt="RexThinker Website" src="https://img.shields.io/badge/RexOmni-Paper-Red%25red?logo=arxiv&logoColor=red&color=yellow" alt="RexThinker Paper on arXiv" src="https://img.shields.io/badge/RexOmni-Weight-orange?logo=huggingface&logoColor=yellow" alt="RexThinker weight on Hugging Face"…

Excerpt from the card by IDEA-Research, licensed other.

Configuration

Architecture
Qwen2_5_VLForConditionalGeneration
Context length (tokens)
128,000
Layers
36
Hidden size
2,048
Feed-forward size
11,008
Attention heads
16
Key/value heads
2
Vocabulary size
151,936
Sliding window (tokens)
32,768
RoPE base
1e+06
Stored precision
float32
Model type
qwen2_5_vl

Identity and Version

Repository
IDEA-Research/Rex-Omni
Publisher
IDEA-Research
Task
Image and text to text
Modality
Image and text
Library
transformers
Parameters
4.1B parameters
Languages
en
Revision
0e5693d24657f6c0e091008dd6809bb1bd28988c
First published
2025-10-09
Last updated
2025-10-16

Files and Weights

16 files, 8.1 GB in total. The weights are 2 files totalling 8.1 GB in safetensors.

Weights2 files · 8.1 GB
Configuration6 files · 69.3 KB
Tokenizer3 files · 5.2 MB
Documentation2 files · 12.5 KB
Other2 files · 2.4 MB
Repository1 file · 1.6 KB
Every file
FileTypeSizeSHA-256
model-00001-of-00002.safetensorsWeights5.0 GB e1b516f2425c
model-00002-of-00002.safetensorsWeights3.1 GB c1bb12842e32
added_tokens.jsonConfiguration605 B
chat_template.jsonConfiguration1.0 KB
config.jsonConfiguration1.5 KB
generation_config.jsonConfiguration121 B
model.safetensors.index.jsonConfiguration65.5 KB
preprocessor_config.jsonConfiguration575 B
LICENSEDocumentation7.0 KB
README.mdDocumentation5.5 KB
assets/logo.pngOther175.5 KB 5ce67bcaa869
assets/teaser.pngOther2.2 MB 45504a193142
.gitattributesRepository1.6 KB
merges.txtTokenizer1.7 MB
tokenizer_config.jsonTokenizer192.1 KB
vocab.jsonTokenizer3.4 MB

License and Download

License
other
Access
Open weights, no gate
Download size
8.1 GB
Download from IDEA-Research

Released by IDEA-Research through its official repository on Hugging Face.

Built From

  • Derived from Qwen/Qwen2.5-VL-3B-Instruct
  • Described by arXiv:2311.13596
  • Described by arXiv:2405.10300
  • Described by arXiv:2411.14347
  • Described by arXiv:2411.18363
  • Described by arXiv:2503.08507
  • Described by arXiv:2506.04034
  • Described by arXiv:2510.12798

Memory Requirements

PrecisionWeights in memory
As published8.1 GB
16-bit8.1 GB
8-bit4.1 GB
4-bit2.0 GB

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

Questions About Rex-Omni

How much GPU memory does Rex-Omni need?

About 9.8 GB at 16-bit and 2.4 GB at 4-bit: the weights (4.1B parameters) plus a working margin. A long context needs more.

What is the cheapest GPU to run Rex-Omni 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 Rex-Omni released under?

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

What is Rex-Omni's context length?

128,000 tokens, from the maximum position embeddings in its published configuration.

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