Mistral Releases Shieldstral 1.0, a Self-Hostable 3B Moderation Model Under Apache 2.0

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Mistral launched Shieldstral 1.0 on August 5, 2026, a 3-billion-parameter model built specifically to moderate text and image content before it reaches end users. The model runs on a single 16GB GPU in BF16 precision and is available on Hugging Face under an Apache 2.0 license, making it accessible to self-hosters without third-party API dependency. A key feature is its policy-adaptive design, allowing moderation rules to be defined in natural language within the prompt rather than requiring retraining when community guidelines change. Mistral reports strong benchmark performance, including 99.4% F1 on HarmBench and 97.7% on the multimodal VLGuard set, though these figures are vendor-reported and have not yet been independently verified. The model supports popular inference frameworks including vLLM, llama.cpp, and SGLang, and is intended as a specialized moderation layer alongside other models rather than a general-purpose replacement.

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