DeepSeek: DeepSeek v4.1 Flash 1017

What happened: DeepSeek released V4.1 Flash 1017, the October 17, 2026 snapshot of its V4.1 Flash model, served under the deepseek-flash API model name. It is the first model built on DeepSeek's Causal Encoder-Decoder architecture. Key numbers: 552B-parameter backbone; 8B parameters activated on input and 16B on output; compressed KV cache about a quarter of the previous Flash generation; pricing $0.15, $0.60, $0.003; 1.22s Why it matters: DeepSeek positions it as the cost-efficient tier of the V4.1 family and reports it exceeds V4 Pro on performance, speed, and task completion time. Coverage: 3 outlets in 24h

DeepSeek released V4.1 Flash 1017, the October 17, 2026 snapshot of its V4.1 Flash model, served under the deepseek-flash API model name. It is the first model built on DeepSeek's Causal Encoder-Decoder architecture.

DeepSeek positions it as the cost-efficient tier of the V4.1 family and reports it exceeds V4 Pro on performance, speed, and task completion time.