DeepSeek V4 Pro launches with 1.6T MoE params and 1M token context

DeepSeek V4 Pro launched April 24, 2026, featuring 1.6T total parameters (MoE architecture) with 49B active parameters and a verified 1M token context window. The model ships with dual Think and Non-Think modes: thinking mode takes 8–15 seconds and targets multi-step planning, while non-thinking mode responds in ~2 seconds for faster pipelines. At $1.74/1M input and $3.48/1M output, it significantly undercuts GPT-4o ($2.50/$10.00) and Claude Sonnet 4.6 ($3.00/$15.00), and is available under an MIT license. The author reports more reliable function calling compared to V3.2 and describes long-context tasks as "finally viable at scale."