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Transformers Release 5.17.0

PreviewVerifiedAdded Sep 22, 2026

Release v5.17.0 New Model additions HYV4 Hy4-Preview is a 780B-parameter mixture-of-experts language model that activates 49B parameters per token. Each MoE layer holds 256 routed experts plus one always-active shared expert and routes every token to 8 of them. The context window is 1M tokens.

Read Hugging Face's release notes

https://github.com/huggingface/transformers/releases/tag/v5.17.0

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