Streamlit 1.63.0 Adds New Widgets, Rust-Powered Cache, and Built-In LLM Support

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Streamlit released version 1.63.0 on September 1, 2026, bringing significant upgrades to its open-source data-app framework used by over 1.2 million monthly active developers. The update introduces three new interactive UI components — a searchable multi-select dropdown, a color-picker with palette presets, and collapsible accordion panels — alongside an expanded theming API. A rewritten Rust-based caching subsystem delivers roughly 20% faster data-loading performance, cutting load time for a 500 MB CSV file from 3.2 to 2.5 seconds. The release also adds native integration with OpenAI, Anthropic, and Cohere APIs through the st.chat_message component, enabling developers to stream LLM responses directly into their apps with minimal code. Streamlit's next version, 1.64.0, is tentatively planned for early 2027 and is expected to focus on real-time collaborative editing and a visual workflow builder.

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