DeepSeek-V4.1-Flash-1017 is a minor update to DeepSeek-V4.1-Flash with improvements across reasoning, coding, and agentic workloads; MIT license weights published Oct 17, 2026.
Changelog (2026-10-17): API model string deepseek-flash routes to 1017 checkpoint; pricing unchanged. Reported benchmark deltas vs prior Flash include Terminal-Bench 42.3 vs 31.2, ProgramBench 29.1 vs 20.3, HLE 42.6 vs 36.8 (vendor-reported).
Architecture per family docs: 552B total / 16B active parameters, 1M context, multimodal text+image input.