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Mistral Large 4 is Mistral AI's flagship multimodal mixture-of-experts model (about 1.05T total, 49B active parameters, 1.6B vision encoder), released in public preview on October 6, 2026 with a 1M-token context window (524K on OpenRouter) and open weights planned for later in October. It targets complex reasoning, coding, agentic workflows, and multilingual and image-understanding tasks as the successor to Mistral Large 3.

GPT-6 Luna is the fast, low-cost tier of OpenAI's GPT-6 series (1.05M-token context, text, image, and file input, $0.10/$0.50 per million input/output tokens), released September 22, 2026 below GPT-6 Sol and the flagship GPT-6 Astra. It is built for high-volume tasks with a clear goal, such as summarization, extraction, classification, quick questions, and lightweight agentic steps.