DeepSeek open-sources DeepInfer, the engine behind V4.1-Flash

DeepSeek released DeepInfer, the inference framework that serves its fast, cheap V4.1-Flash model. It is built on vLLM and aims to cut compute costs and energy use when running models.

Why it matters: Publishing the serving stack, not just weights, lets others reproduce DeepSeek's cost advantage on their own hardware. Paired with its recent V4.1-Flash release and open Search and Fetch APIs, it adds to pricing pressure on closed Western providers.