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Latest / Frontier models and safety

Model releaseFrontierChinaConfirmed

DeepSeek releases V4.1-Flash and routes its V4-Pro traffic to it

See how this story connects

Source: DeepSeek API docs: V4.1-Flash

DeepSeek released DeepSeek-V4.1-Flash, a 552-billion-parameter mixture-of-experts model with a new causal encoder-decoder design that uses 8 billion active parameters for input and 16 billion for output, with open weights on Hugging Face. DeepSeek said it beats its flagship V4-Pro on benchmarks, needs a quarter of the HBM for its KV cache, and from 14 September routed all V4-Pro API requests to V4.1-Flash at Flash prices until V4.1-Pro launches.

Why it matters

Developers on DeepSeek’s API moved to a cheaper open-weights model by default, and anyone can download it to run themselves.

When
10 Sep 2026
ID
WTA-N-2026-0126
Where
China
Who
DeepSeek

Summary by wheresthe.ai, from DeepSeek API docs. Checked against the source on 9 Oct 2026.

Read the original at DeepSeek API docs

Source copy: download the page as saved on 18 Oct 2026 (PDF). Also held by the Internet Archive.

Next stop on this Storyline: Led toDeepSeek releases V4.1-Flash-1017 update with open weights

Cite this story

WTA-N-2026-0126: “DeepSeek releases V4.1-Flash and routes its V4-Pro traffic to it.” wheresthe.ai, 10 Sep 2026. https://wheresthe.ai/d/cn-deepseek-v4-1-flash-2026-09/ (source: DeepSeek API docs: V4.1-Flash).

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