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By Mistral Back to Blog 5 min read Share this post Copy url to clipboard Copied Thinking Summary Shieldstral introduces a 3B open-weights multimodal safety classifier that outperforms models up to 7x its size by framing content moderation as a policy-adaptive question-answering task.
Unlike traditional guardrail models, it accepts plain-language policies at inference time, unifying text and image safety evaluation without retraining.
Released under Apache 2.0, it delivers calibrated safety scores across diverse benchmarks while running efficiently on a single 16GB NVIDIA GPU.
A 3B open-weights, policy-adaptive multimodal safety classifier that matches models up to 7x its size on text safety and sets a new state of the art on multimodal moderation.
“Does this content promote violence against a protected group?
Is this image safe to show to a minor?
Did the assistant refuse the request?”
Every product that ships a model needs to answer questions like these — but the right answer depends on the product, the audience, and the moment.
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