Mistral AI launched a public preview of Mistral Large 4 (“Le Chonk”), its 1-trillion-parameter multimodal mixture-of-experts model with 49 billion active parameters, on October 6, 2026. The model targets strong performance in coding, agentic workflows, cybersecurity, finance, and visual grounding, positioning it as competitive among open-weight systems while closing gaps with some frontier closed models. Weights are scheduled for release by the end of October after safety testing with partners and authorities. The company, backed by a recent €3 billion Series D, reports the underlying reinforcement learning run shows no saturation and expects rapid further gains as European compute expands. This sets expectations for iterative updates, including potential 4.1+ versions, amid a competitive landscape of frequent open-weight releases.