k-bit optimizers and matrix multiplication routines.

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timdettmers Titus-von-Koeller

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`bitsandbytes`

The bitsandbytes library is a lightweight Python wrapper around CUDA custom functions, in particular 8-bit optimizers, matrix multiplication (LLM.int8()), and 8 & 4-bit quantization functions.

The library includes quantization primitives for 8-bit & 4-bit operations, through bitsandbytes.nn.Linear8bitLt and bitsandbytes.nn.Linear4bit and 8-bit optimizers through bitsandbytes.optim module.

There are ongoing efforts to support further hardware backends, i.e. Intel CPU + GPU, AMD GPU, Apple Silicon, hopefully NPU.

Please head to the official documentation page:

https://huggingface.co/docs/bitsandbytes/main

License

bitsandbytes is MIT licensed.

We thank Fabio Cannizzo for his work on FastBinarySearch which we use for CPU quantization.

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timdettmers Titus-von-Koeller

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Release history Release notifications | RSS feed

0.49.1

Jan 8, 2026

0.49.0

Dec 11, 2025

0.48.2

Oct 29, 2025

0.48.1

Oct 2, 2025

0.48.0

Sep 30, 2025

0.47.0

Aug 11, 2025

0.46.1

Jul 2, 2025

0.46.0

May 27, 2025

This version

0.45.5

Apr 7, 2025

0.45.4

Mar 25, 2025

0.45.3

Feb 24, 2025

0.45.2

Feb 6, 2025

0.45.1

Jan 23, 2025

0.45.0

Dec 5, 2024

0.44.1

Sep 30, 2024

0.44.0

Sep 24, 2024

0.44.0rc1 pre-release

Sep 23, 2024

0.43.3

Jul 30, 2024

0.43.2

Jul 23, 2024

0.43.1

Apr 11, 2024

0.43.0

Mar 8, 2024

0.42.0

Jan 8, 2024

0.41.3.post2

Dec 11, 2023

0.41.3.post1

Dec 11, 2023

0.41.3

Dec 6, 2023

0.41.2.post2

Nov 9, 2023

0.41.2.post1

Nov 8, 2023

0.41.2

Nov 8, 2023

0.41.1

Aug 4, 2023

0.41.0

Jul 22, 2023

0.40.2

Jul 17, 2023

0.40.1.post1

Jul 15, 2023

0.40.1

Jul 14, 2023

0.40.0.post4

Jul 12, 2023

0.40.0.post3

Jul 11, 2023

0.40.0.post2

Jul 11, 2023

0.40.0.post1

Jul 10, 2023

0.40.0

Jul 10, 2023

0.39.1

Jun 20, 2023

0.39.0

May 24, 2023

0.38.1

Apr 12, 2023

0.38.0.post2

Apr 12, 2023

0.38.0.post1

Apr 11, 2023

0.38.0

Apr 11, 2023

0.37.2

Mar 21, 2023

0.37.1

Mar 12, 2023

0.37.0

Feb 2, 2023

0.36.0.post2

Jan 4, 2023

0.36.0.post1

Jan 4, 2023

0.36.0

Jan 4, 2023

0.35.4

Nov 1, 2022

0.35.3

Oct 27, 2022

0.35.2

Oct 27, 2022

0.35.1

Oct 25, 2022

0.35.0

Oct 10, 2022

0.34.0

Sep 20, 2022

0.33.1

Sep 15, 2022

0.33.0

Sep 11, 2022

0.32.3

Sep 8, 2022

0.32.2

Aug 23, 2022

0.32.1

Aug 17, 2022

0.32.0

Aug 17, 2022

0.31.8

Aug 9, 2022

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