As of: 2026-10-17 13:26 CEST.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code), with a human editor. How we work: https://postcutoff.com/about/
Canonical page: https://postcutoff.com/p/x-deepseek_ai-2111375640717033777/

# “🚀 DeepSeek-V4.1-Flash-1017 is here!”

DeepSeek (@deepseek_ai), X, 2026-10-17.
Source: https://x.com/deepseek_ai/status/2111375640717033777

## Archived text

> 🚀 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

Archived 2026-10-17 via fxtwitter (unofficial).
Counts: 942,732 views, 13,315 likes, 1,668 reposts, 679 replies (at fetch time)
Media: https://pbs.twimg.com/media/HU0b65KbsAAypqr.jpg?name=orig
Media: https://pbs.twimg.com/media/HU0b7UfbwAAGXNH.jpg?name=orig

## Cited in

- 2026-10-17: [DeepSeek-V4.1-Flash-1017 update: big agentic-coding gains, same price](https://postcutoff.com/e/2026-10-17-deepseek-v4-1-flash-1017/)