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Open-weight model · Robotics

pi05_cubes

by Sielo Robotics SieloRobotics/pi05_cubes

pi05_cubes is an open-weight model for robotics from Sielo Robotics, released under Apache License 2.0. It has 4.1B parameters. At 16-bit it needs about 9.9 GB of GPU memory, which fits on 1x MI300X from $1.85 an hour, at the lowest prices in the SAVRN Index.

π₀.₅ (Pi05) is a Vision-Language-Action model from Physical Intelligence designed for open-world generalization: it evolves π₀ to generalize to entirely new environments and situations that were never seen during training.

Parameters4.1B
Context—
Weights621.4 GB
Licenseapache-2.0
AccessOpen weights
Monthly Downloads—

Runs On

What it takes to serve pi05_cubes (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 8.3 GB 9.9 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
8-bit 4.1 GB 5.0 GB 1x MI300X (192 GB)
Vultr
$1.85 1x H100 $1.99 · 1x MI325X $2.00
4-bit 2.1 GB 2.5 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 19, 2026.

pi05_cubes on every accelerator the SAVRN Index prices, at every precision

Model Card

By Sielo Robotics, published under apache-2.0, revision 65598e67d991.

π₀.₅ (Pi05) is a Vision-Language-Action model from Physical Intelligence designed for open-world generalization: it evolves π₀ to generalize to entirely new environments and situations that were never seen during training. The LeRobot implementation is adapted from their open-source OpenPI repository. This policy has been trained and pushed to the Hub using LeRobot. Learn how to train and run it in the LeRobot pi05 guide, or browse the full documentation. The policy consumes these observation features and produces these action features. Inputs Outputs New to LeRobot? These guides cover the full workflow: - Install LeRobot — set up the lerobot package. - Hardware setup — assemble, wire, and…

Read Sielo Robotics's full model card

Model Card for pi05

π₀.₅ (Pi05) is a Vision-Language-Action model from Physical Intelligence designed for open-world generalization: it evolves π₀ to generalize to entirely new environments and situations that were never seen during training. The LeRobot implementation is adapted from their open-source OpenPI repository.

This policy has been trained and pushed to the Hub using LeRobot.

Learn how to train and run it in the LeRobot pi05 guide, or browse the full documentation.


Model Details

  • License: apache-2.0
  • Fine-tuned from: lerobot/pi05_base
  • Robot type: rebot_b601_follower
  • Cameras: wrist, top

Inputs & Outputs

The policy consumes these observation features and produces these action features.

Inputs

Feature Type Shape
observation.state STATE (7,)
observation.images.wrist VISUAL (3, 480, 640)
observation.images.top VISUAL (3, 480, 640)

Outputs

Feature Type Shape
action ACTION (7,)

Training Dataset

Training Configuration

Setting Value
Training steps 30000
Batch size 16
Optimizer adamw
Learning rate 2.5e-05
Seed 1000
LeRobot version 0.6.2

How to Get Started with the Model

New to LeRobot? These guides cover the full workflow:

The short version to run and train this policy:

Run the policy on your robot

lerobot-rollout \
  --strategy.type=base \
  --robot.type=rebot_b601_follower \
  --robot.port=<your_robot_port> \
  --robot.cameras="{ <camera_1>: {type: opencv, index_or_path: <index_or_path>, width: 640, height: 480, fps: 30}, <camera_2>: {type: opencv, index_or_path: <index_or_path>, width: 640, height: 480, fps: 30}}" \
  --policy.path=SieloRobotics/pi05_cubes \
  --task="pick up the cubes and place them into the box" \
  --duration=60

Replace the remaining <...> placeholders with your own values: --robot.port and the camera names/indices are specific to your machine, and the camera names must match the observation keys this policy was trained on.

When --strategy.type=base is used the script doesn't record the episodes. Skipping duration will make the policy run indefinitely. For more information look at rollout documentation.

Train your own policy

This policy type is usually fine-tuned from the pretrained base model lerobot/pi05_base:

lerobot-train \
  --dataset.repo_id=${HF_USER}/<dataset> \
  --policy.path=lerobot/pi05_base \
  --output_dir=outputs/train/<policy_repo_id> \
  --job_name=lerobot_training \
  --policy.device=cuda \
  --policy.repo_id=${HF_USER}/<policy_repo_id> \
  --wandb.enable=true

Writes checkpoints to outputs/train/<policy_repo_id>/checkpoints/.


Evaluation

No evaluation results have been provided for this policy yet.


Citation

If you use this policy, please cite the method linked in the description above, along with LeRobot:

@misc{cadene2024lerobot,
    author = {Cadene, Remi and Alibert, Simon and Soare, Alexander and Gallouedec, Quentin and Zouitine, Adil and Palma, Steven and Kooijmans, Pepijn and Aractingi, Michel and Shukor, Mustafa and Aubakirova, Dana and Russi, Martino and Capuano, Francesco and Pascal, Caroline and Choghari, Jade and Moss, Jess and Wolf, Thomas},
    title = {LeRobot: State-of-the-art Machine Learning for Real-World Robotics in Pytorch},
    howpublished = "\url{https://github.com/huggingface/lerobot}",
    year = {2024}
}

Identity and Version

Repository
SieloRobotics/pi05_cubes
Publisher
Sielo Robotics
Task
Robotics
Modality
Control
Library
lerobot
Parameters
4.1B parameters
Languages
Not stated by the source
Revision
65598e67d9916d4c9041a7f4d4a6772afd1c1290
First published
2026-10-09
Last updated
2026-10-14

Files and Weights

361 files, 622.3 GB in total. The weights are 128 files totalling 621.4 GB in safetensors.

Weights128 files · 621.4 GB
Configuration179 files · 745.8 KB
Tokenizer52 files · 894.1 MB
Documentation1 file · 6.1 KB
Repository1 file · 4.0 KB
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License and Download

License
apache-2.0
Access
Open weights, no gate
Download size
621.4 GB
Download from Sielo Robotics

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

Built From

  • Derived from lerobot/pi05_base
  • Trained on (disclosed) SieloRobotics/rebot_pick_place

Memory Requirements

PrecisionWeights in memory
As published621.4 GB
16-bit8.3 GB
8-bit4.1 GB
4-bit2.1 GB

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

Questions About pi05_cubes

How much GPU memory does pi05_cubes need?

About 9.9 GB at 16-bit and 2.5 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 pi05_cubes 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 pi05_cubes commercially?

Yes. pi05_cubes 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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