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Physix Frontier · News Briefing Card (enbrief · Oct 25, 2026)

DeepSeek Forms Product Division, Quant Trader Cui Tianyi to Lead Four Teams

KEY FACTS

  • On October 16, DeepSeek merged its Harness, Web, App, and Platform teams into a single Product Division.
  • Quantitative trader Cui Tianyi was appointed head of the Product Division, overseeing product, design, and R&D.
  • R1 core contributor Guo Daya left in March 2026 to join ByteDance Seed as head of the Agent direction.
  • Guo Daya's reason for leaving was his optimism about the Agent direction, which had low priority inside DeepSeek.
  • DeepSeek Harness was open-sourced on August 13 under the MIT license, with a core philosophy of everything as a plugin.

KEY DATA

about 250,000GitHub Stars
20Tasks completed by Harness
19Tasks completed by Claude Code
about 89,000Average token consumption per task for Harness

PHYSIX OBSERVATION

DeepSeek has finally elevated Agent and its product system to strategic priority, but Guo Daya has already left ahead of it. Cui Tianyi's quantitative background means DeepSeek values system organization capability over single-point model breakthroughs. Harness's open-source numbers are impressive, but turning an open-source project into a mature commercial product is the real test.

Source: enbrief original report ↗