fastsafetensors

fastsafetensors is an efficient safetensors loader. If you develop your own code that loads large safetensors files, you can try fastsafetensors APIs (see docs). For example, vLLM and SGLang have --load-format fastsafetensors command-line argument to speed up their initialization.

This library supports Linux/CUDA, ROCm, Windows, 3FS, unified-memory systems such as DGX Spark, and so on. We welcome more platform/storage-specific optimizations like them by adding new copier backends. Our CI tests Python 3.10-3.14 with PyTorch 2.11.0 and Python 3.15 with PyTorch 2.14.1.

Performance Highlights

Performance highlights from the CLOUD 2025 paper and benchmark docs:

Standalone model loading was 4.8x-7.5x faster than the default safetensors deserializer on Llama, Falcon, and Bloom models, and reached 26.4 GB/s NVMe read throughput for Llama-70B on four GPUs with GDS.
In the paper's vLLM integration experiment, startup time dropped from 12.39s to 4.74s for Llama-2-13B on 4x L40S GPUs, and from 16.04s to 6.88s on 1x A100.
On AMD ROCm without GDS, the documented nogds path reached 6.02 GB/s for GPT-2 Medium versus 1.28 GB/s with mmap (4.7x throughput), and 2.62 GB/s for GPT-2 versus 1.01 GB/s with mmap (2.6x throughput). See the report for more details.

Quick Start

pip install fastsafetensors
pip install vllm # for quick demo
vllm serve Qwen/Qwen3-0.6B --load-format fastsafetensors
...
Loading safetensors using Fastsafetensor loader:   0% Completed | 0/1 [00:00<?, ?it/s]
Loading safetensors using Fastsafetensor loader: 100% Completed | 1/1 [00:00<00:00,  1.23it/s]

Design Details

See Overview for features, basic API usage, and configuration.

Code of Conduct

Please refer to Foundation Model Stack Community Code of Conduct.

Development

See Development.

Publication

Takeshi Yoshimura, Tatsuhiro Chiba, Manish Sethi, Daniel Waddington, Swaminathan Sundararaman. (2025) Speeding up Model Loading with fastsafetensors arXiv:2505.23072 and IEEE CLOUD 2025.

Metadata

Release files for fastsafetensors 0.5.0

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for fastsafetensors 0.5.0
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fastsafetensors-0.5.0.tar.gz	128.3 kB	Oct 17, 2026	Without provenance	Details for fastsafetensors-0.5.0.tar.gz

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Total release size: 39.8 MB

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fastsafetensors-0.5.0-cp314-cp314-win_amd64.whl 522.7 kB Oct 17, 2026 Without provenance	CPython 3.14	CPython 3.14	Windows x86-64	Details for fastsafetensors-0.5.0-cp314-cp314-win_amd64.whl
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fastsafetensors-0.5.0-cp313-cp313-win_amd64.whl 511.2 kB Oct 17, 2026 Without provenance	CPython 3.13	CPython 3.13	Windows x86-64	Details for fastsafetensors-0.5.0-cp313-cp313-win_amd64.whl
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fastsafetensors-0.5.0-cp311-cp311-win_amd64.whl 509.7 kB Oct 17, 2026 Without provenance	CPython 3.11	CPython 3.11	Windows x86-64	Details for fastsafetensors-0.5.0-cp311-cp311-win_amd64.whl
fastsafetensors-0.5.0-cp311-cp311-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl 2.7 MB Oct 17, 2026 Without provenance	CPython 3.11	CPython 3.11	Linux glibc 2.27+ x86-64, Linux glibc 2.28+ x86-64	Details for fastsafetensors-0.5.0-cp311-cp311-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl
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fastsafetensors-0.5.0-cp310-cp310-win_amd64.whl 508.0 kB Oct 17, 2026 Without provenance	CPython 3.10	CPython 3.10	Windows x86-64	Details for fastsafetensors-0.5.0-cp310-cp310-win_amd64.whl
fastsafetensors-0.5.0-cp310-cp310-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl 2.7 MB Oct 17, 2026 Without provenance	CPython 3.10	CPython 3.10	Linux glibc 2.28+ x86-64, Linux glibc 2.27+ x86-64	Details for fastsafetensors-0.5.0-cp310-cp310-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl
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fastsafetensors 0.5.0