---
title: "DeepSeek-V4.1-Flash-1017."
canonical: https://archive2050.xyz/archives/20261017-02-deepseek-v4-1-flash-1017/
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# DeepSeek-V4.1-Flash-1017.

Canonical: https://archive2050.xyz/archives/20261017-02-deepseek-v4-1-flash-1017/
Archive: #20261017-02
Date: 2026-10-17
Stratum: object
Field note on X: https://x.com/xiao_2146/status/2111451427692224971

DeepSeek-V4.1-Flash-1017. Open weights · MIT. Released 2026-10-17.

They upgraded the agent under the same API name.

DeepSeek-V4.1-Flash-1017. Open weights · MIT. Released 2026-10-17.

On that day DeepSeek shipped Flash-1017 on its website, app, and API — better agent scores, faster runs, shorter outputs — and dropped the checkpoint on Hugging Face under MIT. A multimodal MoE with a 552B backbone: about 8B parameters active in prefill, 16B in decode, and a one-million-token window. Builders who never changed their endpoint woke up to a different mind. Search and Fetch went public the same afternoon.

Same endpoint. Same price. Different mind.

We file Flash-1017 as the day an open weight arrived wearing yesterday's API badge — and the ledger recorded a silent upgrade, not a press tour.

The cheap mind did not ask permission to improve.