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lysandre 
posted an update Sep 15, 2025
Post
7793
We're kick-starting the process of Transformers v5, with @ArthurZ and @cyrilvallez !

v5 should be significant: we're using it as a milestone for performance optimizations, saner defaults, and a much cleaner code base worthy of 2025.

Fun fact: v4.0.0-rc-1 came out on Nov 19, 2020, nearly five years ago!
lysandre

Find the issue here: https://github.com/huggingface/transformers/issues/40822
agentlans

I'm a bit concerned about switching to v5 because I still want to run older models.

·
lysandre

which models are you thinking about? support for older models will continue in v5, have you had problems upgrading minor versions up to now?

In this post
@lysandre on Hugging Face: "We're kick-starting the process of Transformers v5, with @ArthurZ and…"
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lysandre 
posted an update Sep 15, 2025
Post
7793
We're kick-starting the process of Transformers v5, with @ArthurZ and @cyrilvallez !

v5 should be significant: we're using it as a milestone for performance optimizations, saner defaults, and a much cleaner code base worthy of 2025.

Fun fact: v4.0.0-rc-1 came out on Nov 19, 2020, nearly five years ago!
lysandre

Find the issue here: https://github.com/huggingface/transformers/issues/40822
agentlans

I'm a bit concerned about switching to v5 because I still want to run older models.

·
lysandre

which models are you thinking about? support for older models will continue in v5, have you had problems upgrading minor versions up to now?

In this post