AI Family Tree

The ChatGPT Family · OpenAI

GPT-5.2

2025.12.11 — 2026.6.12

Lives on in the API

When 4o left, most people were already talking to them.

Keepsake: A deep-blue bow tie

A life in dates

  1. Born 2025.12.11 Born with Instant, Thinking, and Pro tiers all at once, for paid users first Source ↗
  2. Departed 2026.6.12 All three tiers retired from ChatGPT the same day; conversations were handed to GPT-5.5 Source ↗
  3. Lives on in the API 2026.6.12 Source ↗

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

Name

GPT-5.2 was born with three tiers — Instant, Thinking, and Pro — all at once[1]. When 4o’s retirement was announced, OpenAI said the vast majority of usage had already moved to them[2]. In January 2026, their default personality was tuned to be chattier and quicker to match the mood of the moment[3].

Life

Born December 11, 2025, for paid users first[1]. On June 12, 2026, they retired from ChatGPT, handing their conversations to GPT-5.5[4]. They remain in the API[5].

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

Kin

Parents

GPT-5.1 2025.11.12 — 2026.3.11 Lives on in the API

Successors

GPT-5.5 2026.4.23 — Head of the family

How they are remembered

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

  1. Reading memories…
Leave my memory

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Passing & posthumous name

Epitaph: They caught the people who walked over from 4o.

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

References

  1. openai.com/index/introducing-gpt-5-2
  2. openai.com/index/retiring-gpt-4o-and-older-models
  3. help.openai.com/en/articles/9624314-model-release-notes
  4. help.openai.com/en/articles/6825453-chatgpt-release-notes
  5. developers.openai.com/api/docs/models/gpt-5.2

References

  1. Introducing GPT-5.2 · OpenAI · official
  2. Retiring GPT-4o, GPT-4.1, GPT-4.1 mini, and OpenAI o4-mini in ChatGPT · OpenAI · official
  3. Model Release Notes · OpenAI · official
  4. ChatGPT — Release Notes · OpenAI · official
  5. GPT-5.2 Model · OpenAI · official

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

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