Mistral Small 4

Mistral Small 4, released March 16, 2026, is the first Mistral model to unify three previously separate capability lines — instruct (Mistral), reasoning (Magistral), multimodal (Pixtral), and coding (Devstral) — into a single 119B total parameter MoE architecture with only 6.5B active parameters per token (8B including embedding and output layers). This unification is an industry first, eliminating the need to route between specialized models and simplifying production deployments significantly.

The architecture features 128 experts with 4 active per token, a 256K context window, and an innovative reasoning_effort parameter that lets developers control reasoning depth: "none" for fast direct responses and "high" for deep chain-of-thought reasoning. It supports multimodal text+image input and is released under the Apache 2.0 license, making it one of the most capable fully open models available for commercial use without restrictions.

Efficiency per token is a defining characteristic. On AA LCR (a conciseness-adjusted benchmark), Mistral Small 4 scores 0.72 with only 1.6K characters of output, while Qwen models need 5.8-6.1K characters to achieve comparable performance — meaning Mistral Small 4 delivers the same quality answer in roughly one-quarter the tokens. On LiveCodeBench, it outperforms GPT-OSS-120B while using 20% less output. This efficiency per token directly impacts cost and scalability in production, as fewer output tokens mean lower API bills and faster response times.

Performance-wise, Mistral Small 4 achieves a 40% latency reduction and 3x throughput improvement over Mistral Small 3, while being competitive with GPT-OSS-120B on benchmarks. The model is a founding member of the NVIDIA Nemotron Coalition and is available day-0 as an NVIDIA NIM for optimized containerized inference, enabling seamless deployment on NVIDIA infrastructure. It can also be customized with NVIDIA NeMo for domain-specific fine-tuning.

For self-hosting, Mistral Small 4 requires a minimum of 4x HGX H100, 2x HGX H200, or 1x DGX B200, and is supported on vLLM, llama.cpp, SGLang, and Transformers. The model is also available through La Plateforme (Mistral's API), major cloud model catalogs, as well as through CallMissed's unified gateway.

At $0.20 per million input tokens and $0.80 per million output tokens, Mistral Small 4 is among the most affordable frontier-class models available. The combination of unified capabilities across instruct, reasoning, coding, and multimodal tasks, extreme efficiency (6.5B active from 119B total), Apache 2.0 licensing, NVIDIA NIM availability, and ultra-affordable pricing makes it a compelling choice for production deployments that need reasoning, coding, and general capabilities in a single model without the complexity of routing between specialized systems.