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Open-weight model · Image and text to text

REX-Intern-S2-Bio-F3

by AI45Research AI45Research/REX-Intern-S2-Bio-F3

REX-Intern-S2-Bio-F3 is an open-weight model for image and text to text from AI45Research, released under Apache License 2.0. It has 36.1B parameters. At 16-bit it needs about 86.7 GB of GPU memory, which fits on 1x MI300X from $1.85 an hour, at the lowest prices in the SAVRN Index. It draws 18 downloads a month.

Parameters36.1B
Context—
Weights—
Licenseapache-2.0
AccessOpen weights
Monthly Downloads18

Runs On

What it takes to serve REX-Intern-S2-Bio-F3 (36.1B 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 72.3 GB 86.7 GB 1x MI300X (192 GB)
Vultr
$1.85 1x MI325X $2.00 · 1x MI355X $2.59
8-bit 36.1 GB 43.4 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
4-bit 18.1 GB 21.7 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 20, 2026.

REX-Intern-S2-Bio-F3 on every accelerator the SAVRN Index prices, at every precision

Model Card

Identity and Version

Repository
AI45Research/REX-Intern-S2-Bio-F3
Publisher
AI45Research
Task
Image and text to text
Modality
Image and text
Library
transformers
Parameters
36.1B parameters
Languages
rex
Revision
c89ce73384367c19dbbb5ac51b1d177df8475295
First published
2026-10-16
Last updated
2026-10-20

License and Download

License
apache-2.0
Access
Open weights, no gate
Download from AI45Research

Released by AI45Research through its official repository on Hugging Face. Read the license.

Built From

Memory Requirements

PrecisionWeights in memory
16-bit72.3 GB
8-bit36.1 GB
4-bit18.1 GB

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

Questions About REX-Intern-S2-Bio-F3

How much GPU memory does REX-Intern-S2-Bio-F3 need?

About 86.7 GB at 16-bit and 21.7 GB at 4-bit: the weights (36.1B parameters) plus a working margin. A long context needs more.

What is the cheapest GPU to run REX-Intern-S2-Bio-F3 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 REX-Intern-S2-Bio-F3 commercially?

Yes. REX-Intern-S2-Bio-F3 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.

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