Model Overview & Capabilities
DeepSeek-V4.1-Flash (checkpoint 1017, released October 17, 2026) is an enhanced post-training iteration of DeepSeek’s open-weights flash series, securing Rank #13 on our global leaderboard with an empirical composite score of 42.6. In verified benchmarks, checkpoint 1017 achieves 43.5% on SWE-bench Verified, 42.0% on Terminal-Bench 2.0, 43.0% on Aider Polyglot, and 84.0% on GPQA Diamond scientific evaluations.
DeepSeek continues to lead the global AI industry in cost-to-performance efficiency, billing just $0.15 per million input tokens and $0.60 per million output tokens, which results in an effective blended price of $0.26 per million tokens under 3:1 weighting, with cached input hits costing only $0.003 per million tokens. This translates to an unprecedented $0.0062 per index point, making it the most cost-effective reasoning engine available anywhere.
With a massive 1,000,000-token context window, an enormous 384,000-token maximum output limit, generation speeds of 186 tokens per second, and a permissive open MIT license, DeepSeek V4.1 Flash 1017 is the benchmark standard for high-volume automated code analysis, continuous integration pull request triage, and autonomous multi-agent software pipelines across budget-conscious developer teams worldwide.
