Mistral Small 4

Mistral Small 4, released March 16, 2026, is Mistral AI's open-weight hybrid model that consolidates three previously separate model families—Instruct, Reasoning (formerly Magistral), and Devstral coding—into a single checkpoint. It uses a Mixture-of-Experts architecture with 119 billion total parameters spread across 128 experts, activating only 4 experts (about 6.5 billion parameters) per token, giving it the inference profile of a much smaller dense model. It accepts text and image input, supports a 256K-token context window, and exposes a configurable reasoning-effort parameter that toggles between fast instant replies and a slower thinking mode.

This marks a substantial change from its same-family predecessor, [[sibling:mistral-small-3-2-24b-instruct|Mistral Small 3.2 24B Instruct]], a 24B dense instruction model from January 2026. Where Small 3.2 focused on text instruction following, Small 4 moves to a sparse MoE design, adds native vision, integrates dedicated reasoning and agentic-coding behavior, and expands deployment to enterprise-scale tasks.

Mistral distributes Small 4 under the Apache 2.0 license with multiple checkpoints, including an NVFP4 4-bit quantized version and a trained Eagle head for speculative decoding. Mistral positions it for chat assistants, coding, agentic workflows, and reasoning tasks, with native function calling and JSON output.

Sources

Mistral Small 4 - Mistral AI | Mistral Docs· docs.mistral.aimistralai / mistral-small-4-119b-2603· docs.api.nvidia.commistral-small-4-119b-2603 Model by Mistral AI· build.nvidia.commistralai/Mistral-Small-4-119B-2603 · Hugging Face· huggingface.co

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