ChatGPT Timeline Hub: Releases, Features, and Major Events

Table of Contents

The timeline is organized into three streams:

Model Releases
Feature Changes
Major Events

How to use this timeline
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Start with Model Releases for capability milestones, then check Feature Changes for practical updates, and use Major Events for ecosystem context.

2026

ChatGPT Model Release Timeline: Year-by-Year Tracking of Iterations, Capability Leaps, and Rollout Cadence

1 April 2026·Updated: 28 June 2026

Jun 2026: OpenAI officially previewed the GPT-5.6 series (Sol / Terra / Luna), introducing a new capability-tier naming system; currently in limited preview for trusted partners

ChatGPT Major Events Timeline: Industry Milestones by Date

1 April 2026·Updated: 2 June 2026

Early-Jun 2026 update: late-May Codex secondary phone verification reports surged on X, highlighting disposable-number recovery risk

ChatGPT Feature Changes Timeline: Product Updates by Date

1 April 2026·Updated: 28 June 2026

Added June 17–26, 2026 release updates: Scheduled Tasks GA, Record & Replay in Codex, app experience updates, large-paste-to-attachment for Free/Go, GPT-5.5 Instant quality update, Codex Remote GA + DigitalOcean plugin, Personal Finances expanded to Plus/Android, new voice dictation model, GPT-4.5 retirement.

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How to use this timeline#

2026

How to use this timeline
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