Granite Switch 4.1 3B Preview Model Summary: Granite Switch 4.1 3B Preview is a modular LLM built on IBM Granite 4.1 3B with embedded adapters from the Granite Libraries collection. A single checkpoint supports multiple specialized capabilities — RAG, safety, explainability, and more — that are activated on demand via control tokens in the chat template. For full details on model composition and adapter configuration, see BUILD.md. Base Model: ibm granite/granite 4.1 3b (3B params, 128K context) Adapters: 12 adapters from granitelib rag r1.0, granitelib core r1.0, and granitelib guardian r1.0 License: Apache 2.0 Release Date: May 5th, 2026 Backends: HuggingFace Transformers, vLLM Automatically Composed with: granite switch Granite Switch is also available in granite switch 4.1 8b preview and granite switch 4.1 30b preview. Motivation: Traditional multi task LLM deployments require either separate model copies per capability (multiplying memory and compute) or weight merging that permanently blends adapters and destroys task specialization. Granite Switch takes a different approach: independently trained activated LoRA adapters are embedded in a single checkpoint and dynamically sel…
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