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Mistral Medium 3.5

Mistral Medium 3.5 is Mistral’s first flagship merged model, designed to unify chat, reasoning, and coding in a single set of weights. It is a dense 128B model with a 256K context window, configurable reasoning effort per request, and a vision encoder trained from scratch for variable image sizes and aspect ratios. Mistral positions it for long-horizon tasks, reliable multi-tool calling, and structured outputs for downstream systems, and reports 77.6% on SWE-Bench Verified while saying it can self-host on as few as four GPUs.
New Multimodal Gen 3
Released: April 27, 2026

Overview

Mistral Medium 3.5 is Mistral’s new flagship merged model for instruction following, reasoning, and coding. It is a dense 128B model with a 256K context window, built for long-horizon productivity and agentic work, with configurable reasoning effort and strong self-hosted efficiency.

About Mistral AI

Mistral AI is a company that specializes in artificial intelligence and machine learning solutions.

Industry: Artificial Intelligence
Company Size: 316
Location: Paris, FR
Website: mistral.ai
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Last updated: May 3, 2026
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