DeepSeek launches V4.1 Flash: wish-style programming, weights and search API opened simultaneously

DeepSeek launched DeepSeek-V4.1-Flash-1017, with web, app, and API updated simultaneously and prices unchanged; weights are open on Hugging Face and ModelScope under the MIT license. Official comparisons show it rose from 74.2 to 77.0 on DeepSWE v1.1, and from 31.2 to 42.3 on Terminal-Bench 4.0, with the average cost per task at the max tier dropping from 3-4 yuan to 1-2 yuan. The self-developed search API is also open, with Search and Fetch each at 5 yuan per 1,000 calls, and server-side calls will be billed starting at 00:00 Beijing time on November 1, 2026.