# Hugging Face — Transformers v5: Simple model definitions powering the AI ecosystem

- Company: Hugging Face (huggingface.co)
- Announced: 2025-12-01T00:00:00+00:00
- Category: developer-tool-release
- Subject: Platform
- Source: https://huggingface.co/blog/transformers-v5
- Record: https://forck.live/items/1577-transformers-v5-simple-model-definitions-powering-the-ai-ecosystem

Hugging Face releases Transformers v5, focusing on simplicity, training, inference, and production. Key changes include a modular design, removal of Flax/TensorFlow support in favor of PyTorch, simplification of tokenization (removing Fast/Slow tokenizers), and new tooling for model conversion.

## Evidence

Verbatim from https://huggingface.co/blog/transformers-v5:

> Today, as we launch v5, Transformers is installed more than 3 million times each day via pip - up from 20,000/day in v4 🤯. Altogether, it has now surpassed 1.2 billion installs!

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