DeepSeek V4.1 Flash officially launched, fully adapted to Harness

DeepSeek officially launched V4.1 Flash on Thursday morning across web, App, and API, featuring a 552B-parameter MoE architecture with native multimodal support, which the company claims surpasses V4 Pro in performance, speed, and efficiency. The V4 Pro API will be retired on September 14, with requests automatically routed to V4.1 Flash, and DeepSeek Harness v0.1.5 is updated in sync. This move could further reduce inference costs and challenge top closed-source models on some benchmarks.