DeepSeek V4.1 Flash takes on frontier AI models at a fraction of the cost

China's open-weight model posts top-tier coding scores while undercutting closed rivals on price and speed DeepSeek ’s latest model was reportedly tested at 90% lower cost while pushing out more than 237 tokens per second, according to a widely shared post on X. The model in question is DeepSeek-V4.1-Flash, and it is quietly forcing an uncomfortable question onto every pricing team at the big AI labs: what exactly are customers paying extra for? DeepSeek launched V4.1-Flash on September 10, 2026. The model carries 552 billion total parameters. It uses a sparse mixture-of-experts design, or MoE, where only about 8 billion parameters are active when the model processes input and roughly 16 billion kick in when it generates output.

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