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DeepSeek V4.1 Flash 1017 Released

DeepSeek launches V4.1-Flash-1017 with stronger benchmarks, faster tasks and shorter outputs, now live on web, app and API.

First on the board Oct 17, 16:51 · How the board is ranked

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Key points

DeepSeek released DeepSeek-V4.1-Flash-1017, now live on its website, app, and API.
The model delivers stronger benchmark performance, faster task completion, and shorter outputs than the previous version.
It is optimized for DeepSeek Harness, Tencent CodeBuddy, WorkBuddy, and more, with DeepSeek Harness v0.2.1-rc.1 or later recommended.

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Original post

DeepSeek @deepseek_ai 1.1M followersOct 17, 16:35

🚀 DeepSeek-V4.1-Flash-1017 is here! Stronger benchmark performance, faster task completion, and shorter outputs than the previous version—a Pareto improvement in performance and cost. Now live on our website, app, and API. 🛠️ Optimized for @DeepSeekHarness, Tencent CodeBuddy, WorkBuddy, and more. Upgrade to DeepSeek Harness v0.2.1-rc.1 or later for the best experience with the new model. 1/4

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What others are saying

3 more

Chubby♨️ @kimmonismus Oct 17, 16:321,032

DeepSeek 4.1-1017 is roughly on par with Opus 5, outperforms GLM5.3 and GPT-5.6 Sol, a big jump over the regular Flash version.
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Tianyi Cui @tianyi Oct 17, 16:40814

Tianyi Cui says users should upgrade to DeepSeek Harness 0.2.1-rc.1+ to fully use DeepSeek-V4.1-Flash-1017.
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Chubby♨️ @kimmonismus Oct 17, 17:16423

DeepSeek V4.1 Flash-1017 beats GPT-5.6 Sol and Opus 5 on some coding and agent benchmarks at far lower token prices.
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