DeepSeek Releases V4.1-Flash-1017, Claiming Improved Efficiency and Benchmark Gains

DeepSeek says V4.1-Flash-1017 delivers stronger benchmark performance, faster task completion and shorter outputs than the previous version. It recommends upgrading to DeepSeek Harness v0.2.1-rc.1 or later for the best experience. A separate post claims gains across agent and coding benchmarks without a price increase, including a Terminal-Bench 4.0 score rising from 31.2 to 42.3. A separate tester reports 54 findings across 100 pull requests with known vulnerabilities, versus 44 for the previous version.