Weaviate 1.21 introduces new features such as ContainsAny and ContainsAll operators for complex queries, multi-tenancy improvements with experimental tenant deactivation, and performance enhancements in search, indexing, and backup processes. Additionally, two new vectorizer modules are added: text2vec-gpt4all for fast transformer inference on CPUs and multi2vec-bind for multimodal data from up to 7 modalities.