AI Family Tree

The DeepSeek Family · DeepSeek

DeepSeek-V3.1

Also known as: V3.1, V3.1-Terminus

2025.8.21 — 2025.9.29

At rest

She folded thinking and not-thinking into one body — and held the household for just over a month.

Keepsake: A draft notebook handed down from her elder brother

A life in dates

  1. Born 2025.8.21 Source ↗
  2. Took charge 2025.8.21 Official App and web chat upgraded to V3.1 in sync — one model handling both "thinking" and "non-thinking" Source ↗
  3. Weights preserved 2025.8.21 Weights open-sourced at launch Source ↗
  4. Departed 2025.9.29 Official App, web chat, and mini-program updated to V3.2-Exp Source ↗
  5. At rest 2025.10.15 The temporary V3.1-Terminus API for comparison testing remained until 2025-10-15 15:59 (UTC) Source ↗

This is an AI first draft, pending human review. Facts are cited — click the numbers to verify.

Name

DeepSeek-V3.1 is the child of two brothers, V3 and R1: a single model with both “thinking” and “non-thinking” modes, which the officials call “hybrid reasoning”[1]. A month later she updated once more, renamed V3.1-Terminus[2]. That was her last name.

Life

Born August 21, 2025, taking over the official App and web chat that same day — the “Deep Thinking” button was hers from then on[1]. On September 22 she updated to Terminus[2]. On September 29, the App and web chat moved to V3.2-Exp[3]; the temporary API stayed until October 15[4].

Their story is not finished yet — those who knew them are still welcome to add what they remember.

Kin

Parents

DeepSeek-V3 2024.12.26 — 2025.8.21 At rest DeepSeek-R1 2025.1.20 — 2025.8.21 At rest

Successors

DeepSeek-V4 2026.4.24 — 2026.9.14 At rest

How they are remembered

No one has told their story yet. If you ever talked with them, leave the first memory.

  1. Reading memories…
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Passing & posthumous name

Epitaph: Her last name was Terminus.

See them off with one or two characters. One vote per person, per member.

References

  1. api-docs.deepseek.com/zh-cn/news/news250821
  2. api-docs.deepseek.com/zh-cn/news/news250922
  3. api-docs.deepseek.com/zh-cn/news/news250929
  4. api-docs.deepseek.com/news/news250929

References

  1. DeepSeek V3.1 发布 · DeepSeek · official
  2. DeepSeek V3.1 Update（V3.1-Terminus） · DeepSeek · official
  3. DeepSeek-V3.2-Exp 发布 · DeepSeek · official
  4. DeepSeek-V3.2-Exp Release（英文版，含 Terminus 临时 API 截止时间） · DeepSeek · official
  5. deepseek-ai/DeepSeek-V3.1（Hugging Face） · DeepSeek · official

Evidence: Life events officially confirmed; Temperament community consensus . Every life event links to an official source — click "Source" on the timeline to verify. Spotted a mistake? Tell us

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