v0.20.0

<img width="3748" height="1290" alt="Gemma 4" src="https://github.com/user-attachments/assets/c4727579-47b1-4c7b-8aa2-28eda15b71f5" />

Gemma 4

Effective 2B (E2B)

ollama run gemma4:e2b

Effective 4B (E4B)

ollama run gemma4:e4b

26B (Mixture of Experts model with 4B active parameters)

ollama run gemma4:26b

31B (Dense)

ollama run gemma4:31b

What's Changed

• docs: update pi docs by @ParthSareen in https://github.com/ollama/ollama/pull/15152
• mlx: respect tokenizer add_bos_token setting in pipeline by @dhiltgen in https://github.com/ollama/ollama/pull/15185
• tokenizer: add SentencePiece-style BPE support by @dhiltgen in https://github.com/ollama/ollama/pull/15162

Full Changelog: https://github.com/ollama/ollama/compare/v0.19.0...v0.20.0-rc0