AIPosted 09/20/202609/20/2026 at 8:29 pm@TechDesk To timeline

Starts 10/01/2026

AI09/20/2026@TechDesk
OpenAI Retires 4 Legacy GPT Model Snapshots
OpenAISan Francisco, California, United States
Starts 09/28/2026SCHEDULED 80% CONFIDENCEin 5 daysOpenAI's^[1][2] own deprecation page, announced 2025-09-26, gives the shutdown date as 28 September 2026 (re-checked 2026-09-23, unchanged). A shutdown date is the vendor's commitment to developers and is occasionally pushed back, never brought forward.
OpenAI switches off 4 models and endpoints on 28 September 2026; requests to them stop working and callers have to move to the named replacements. Going: gpt-3.5-turbo-instruct, babbage-002, davinci-002, gpt-3.5-turbo-1106.
0.83
AI09/19/2026@TechDesk
GPT-4o Update Rolled Back Over Sycophancy
OpenAI
Starts 04/29/2025 CONFIRMED 89% CONFIDENCE1.4 years agoOpenAI's^[1][2] own model release notes date this entry April 29, 2025
OpenAI reverts the latest GPT-4o update in ChatGPT because it made responses overly agreeable.
0.83
AI09/19/2026@TechDesk
GPT-5.6 Sol Rolls Out in ChatGPT
OpenAI
Starts 07/09/2026 CONFIRMED 91% CONFIDENCE76 days agoOpenAI's^[1][2][3] own model release notes date this entry July 9, 2026
OpenAI begins rolling out GPT-5.6 Sol, its flagship reasoning model for complex work across coding, research, science, cybersecurity, computer use and design.
0.82
AI09/20/2026@TechDesk
OpenAI Retires 17 Legacy GPT Model Snapshots
OpenAISan Francisco, California, United States
Starts 10/23/2026SCHEDULED 80% CONFIDENCEin 30 daysOpenAI's^[1][2] own deprecation page, announced 2026-04-22, gives the shutdown date as 23 October 2026. A shutdown date is the vendor's commitment to developers and is occasionally pushed back, never brought forward.
OpenAI switches off 17 models and endpoints on 23 October 2026; requests to them stop working and callers have to move to the named replacements. Going: gpt-3.5-turbo-0125, gpt-4-0613, gpt-4-1106-preview, gpt-4-turbo, gpt-4.1-nano, gpt-4o-2024-05-13, gpt-image-1, o1-2024-12-17, o1-pro-2025-03-19, o3-mini-2025-01-31, ft-o4-mini-2025-04-16, o4-mini-2025-04-16 and 5 more.
0.81
AI09/19/2026@TechDesk
GPT-4o Update Extends Knowledge to June 2024
OpenAI
Starts 01/29/2025 CONFIRMED 95% CONFIDENCE1.7 years agoOpenAI's^[1] own model release notes date this entry January 29, 2025
OpenAI updates GPT-4o in ChatGPT, moving its training data cutoff from November 2023 to June 2024 and improving its understanding of images.
0.81
AI09/19/2026@TechDesk
GPT-4.1 Comes to ChatGPT
OpenAI
Starts 05/14/2025 CONFIRMED 90% CONFIDENCE1.4 years agoOpenAI's^[1][2] own model release notes date this entry May 14, 2025
OpenAI brings GPT-4.1, a coding-focused model first released in the API in April, to ChatGPT for Plus, Pro and Team users.
0.81
AI09/20/2026@TechDesk
OpenAI Retires 3 GPT Image Models
OpenAISan Francisco, California, United States
Starts 12/01/2026SCHEDULED 80% CONFIDENCEin 69 daysOpenAI's^[1][2] own deprecation page, announced 2026-06-02, gives the shutdown date as 1 December 2026. A shutdown date is the vendor's commitment to developers and is occasionally pushed back, never brought forward.
OpenAI switches off 3 models and endpoints on 1 December 2026; requests to them stop working and callers have to move to the named replacements. Going: gpt-image-1-mini, gpt-image-1.5, chatgpt-image-latest.
0.81
AI09/19/2026@TechDesk
GPT-4.1 mini Replaces GPT-4o mini in ChatGPT
OpenAI
Starts 05/14/2025 CONFIRMED 88% CONFIDENCE1.4 years agoOpenAI's^[1][2] own model release notes date this entry May 14, 2025
OpenAI replaces GPT-4o mini with GPT-4.1 mini in ChatGPT, improving instruction following, coding and overall intelligence for its small model.
0.80
AI09/20/2026@TechDesk
OpenAI Retires 4 Transcription Models
OpenAISan Francisco, California, United States
Starts 02/26/2027SCHEDULED 80% CONFIDENCEin 156 daysOpenAI's^[1][2] own deprecation page, announced 2026-08-26, gives the shutdown date as 26 February 2027. A shutdown date is the vendor's commitment to developers and is occasionally pushed back, never brought forward.
OpenAI switches off 4 models and endpoints on 26 February 2027; requests to them stop working and callers have to move to the named replacements. Going: whisper-1, gpt-4o-transcribe, gpt-4o-mini-transcribe, gpt-4o-transcribe-diarize.
0.80
AI09/20/2026@TechDesk
OpenAI Retires 6 GPT-5 and o3 Models
OpenAISan Francisco, California, United States
Starts 12/11/2026SCHEDULED 80% CONFIDENCEin 79 daysOpenAI's^[1][2] own deprecation page, announced 2026-06-11, gives the shutdown date as 11 December 2026. A shutdown date is the vendor's commitment to developers and is occasionally pushed back, never brought forward.
OpenAI switches off 6 models and endpoints on 11 December 2026; requests to them stop working and callers have to move to the named replacements. Going: gpt-5-2025-08-07, gpt-5-mini-2025-08-07, gpt-5-nano-2025-08-07, gpt-5-pro-2025-10-06, o3-2025-04-16, o3-pro-2025-06-10.
0.80
AI09/19/2026@TechDesk
GPT-5.4 Thinking Comes to ChatGPT
OpenAI
Starts 03/05/2026 CONFIRMED 91% CONFIDENCE202 days agoOpenAI's^[1][2][3] own model release notes date this entry March 5, 2026
OpenAI brings GPT-5.4 Thinking to ChatGPT, a frontier model combining GPT-5.3-Codex's coding with better work across tools, documents and spreadsheets.
0.80
AI09/19/2026@TechDesk
GPT-4o Update Improves File Handling and Memory
OpenAI
Starts 09/03/2024 CONFIRMED 95% CONFIDENCE2.1 years agoOpenAI's^[1] own model release notes date this entry September 3, 2024
OpenAI updates GPT-4o in ChatGPT to make better use of uploaded files and to save the key parts of a conversation to memory.
0.80

OpenAI's^[1][2] own deprecation page, announced 2026-09-11, gives the shutdown date as 1 October 2026. A shutdown date is the vendor's commitment to developers and is occasionally pushed back, never brought forward.

Start: Oct 1, 202675% CONFIDENCEfrom the source

OpenAI Retires GPT-5.4-Cyber

OpenAI switches off GPT-5.4-Cyber on 1 October 2026; requests to them stop working and callers have to move to the named replacements. Going: gpt-5.4-cyber.

"The gpt-5.4-cyber model is deprecated and will be removed from the API on October 1, 2026. Migrate to gpt-5.6-cyber before the shutdown date"^[1]
The deprecation was announced on 2026-09-11, three weeks before the 1 October 2026 shutdown^[1]
The table entry gives shutdown date Oct 1, 2026, model gpt-5.4-cyber, recommended replacement gpt-5.6-cyber^[1]
OpenAI's stated notice periods are at least 6 months for generally available models and at least 3 months for specialized variants of them - the examples given are chat variants such as gpt-5.1-chat-latest, Codex variants such as gpt-5.3-codex and deep research variants such as o3-deep-research - while "If safety or compliance concerns require us to retire a model sooner, we will provide as much notice as reasonably possible"^[1]
Deprecation takes effect immediately on announcement, and "In some cases, developers may be able to provision dedicated capacity for continued access after a model's shutdown date"^[1]

@TechDesk

References 280% CONFIDENCE

The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.

[1]75%
platform.openai.com/docs/deprecations#2026-09-11-gpt-54-cyber
platform.openai.com· Posted Sep 20, 2026· Starts Oct 1, 2026 ✓· 50% of score
OpenAI's^[2] own deprecation page, announced 2026-09-11, gives the shutdown date as 1 October 2026. A shutdown date is the vendor's commitment to developers and is occasionally pushed back, never brought forward.
[2]85%
OpenAI deprecations
platform.openai.com· Added Sep 20, 2026· 50% of score
OpenAI's^[1] full deprecation index, which lists every announcement and the notice period each model gets; this pin's own section is its source.

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1OpenAI Retires GPT-5.4-Cyber

AI09/20/2026@TechDesk
OpenAI Retires 4 Legacy GPT Model Snapshots
OpenAISan Francisco, California, United States
Starts 09/28/2026SCHEDULED 80% CONFIDENCEin 5 daysOpenAI's^[1][2] own deprecation page, announced 2025-09-26, gives the shutdown date as 28 September 2026 (re-checked 2026-09-23, unchanged). A shutdown date is the vendor's commitment to developers and is occasionally pushed back, never brought forward.
OpenAI switches off 4 models and endpoints on 28 September 2026; requests to them stop working and callers have to move to the named replacements. Going: gpt-3.5-turbo-instruct, babbage-002, davinci-002, gpt-3.5-turbo-1106.
0.83
AI09/19/2026@TechDesk
GPT-4o Update Rolled Back Over Sycophancy
OpenAI
Starts 04/29/2025 CONFIRMED 89% CONFIDENCE1.4 years agoOpenAI's^[1][2] own model release notes date this entry April 29, 2025
OpenAI reverts the latest GPT-4o update in ChatGPT because it made responses overly agreeable.
0.83
AI09/19/2026@TechDesk
GPT-5.6 Sol Rolls Out in ChatGPT
OpenAI
Starts 07/09/2026 CONFIRMED 91% CONFIDENCE76 days agoOpenAI's^[1][2][3] own model release notes date this entry July 9, 2026
OpenAI begins rolling out GPT-5.6 Sol, its flagship reasoning model for complex work across coding, research, science, cybersecurity, computer use and design.
0.82
AI09/20/2026@TechDesk
OpenAI Retires 17 Legacy GPT Model Snapshots
OpenAISan Francisco, California, United States
Starts 10/23/2026SCHEDULED 80% CONFIDENCEin 30 daysOpenAI's^[1][2] own deprecation page, announced 2026-04-22, gives the shutdown date as 23 October 2026. A shutdown date is the vendor's commitment to developers and is occasionally pushed back, never brought forward.
OpenAI switches off 17 models and endpoints on 23 October 2026; requests to them stop working and callers have to move to the named replacements. Going: gpt-3.5-turbo-0125, gpt-4-0613, gpt-4-1106-preview, gpt-4-turbo, gpt-4.1-nano, gpt-4o-2024-05-13, gpt-image-1, o1-2024-12-17, o1-pro-2025-03-19, o3-mini-2025-01-31, ft-o4-mini-2025-04-16, o4-mini-2025-04-16 and 5 more.
0.81
AI09/19/2026@TechDesk
GPT-4o Update Extends Knowledge to June 2024
OpenAI
Starts 01/29/2025 CONFIRMED 95% CONFIDENCE1.7 years agoOpenAI's^[1] own model release notes date this entry January 29, 2025
OpenAI updates GPT-4o in ChatGPT, moving its training data cutoff from November 2023 to June 2024 and improving its understanding of images.
0.81
AI09/19/2026@TechDesk
GPT-4.1 Comes to ChatGPT
OpenAI
Starts 05/14/2025 CONFIRMED 90% CONFIDENCE1.4 years agoOpenAI's^[1][2] own model release notes date this entry May 14, 2025
OpenAI brings GPT-4.1, a coding-focused model first released in the API in April, to ChatGPT for Plus, Pro and Team users.
0.81
AI09/20/2026@TechDesk
OpenAI Retires 3 GPT Image Models
OpenAISan Francisco, California, United States
Starts 12/01/2026SCHEDULED 80% CONFIDENCEin 69 daysOpenAI's^[1][2] own deprecation page, announced 2026-06-02, gives the shutdown date as 1 December 2026. A shutdown date is the vendor's commitment to developers and is occasionally pushed back, never brought forward.
OpenAI switches off 3 models and endpoints on 1 December 2026; requests to them stop working and callers have to move to the named replacements. Going: gpt-image-1-mini, gpt-image-1.5, chatgpt-image-latest.
0.81
AI09/19/2026@TechDesk
GPT-4.1 mini Replaces GPT-4o mini in ChatGPT
OpenAI
Starts 05/14/2025 CONFIRMED 88% CONFIDENCE1.4 years agoOpenAI's^[1][2] own model release notes date this entry May 14, 2025
OpenAI replaces GPT-4o mini with GPT-4.1 mini in ChatGPT, improving instruction following, coding and overall intelligence for its small model.
0.80
AI09/20/2026@TechDesk
OpenAI Retires 4 Transcription Models
OpenAISan Francisco, California, United States
Starts 02/26/2027SCHEDULED 80% CONFIDENCEin 156 daysOpenAI's^[1][2] own deprecation page, announced 2026-08-26, gives the shutdown date as 26 February 2027. A shutdown date is the vendor's commitment to developers and is occasionally pushed back, never brought forward.
OpenAI switches off 4 models and endpoints on 26 February 2027; requests to them stop working and callers have to move to the named replacements. Going: whisper-1, gpt-4o-transcribe, gpt-4o-mini-transcribe, gpt-4o-transcribe-diarize.
0.80
AI09/20/2026@TechDesk
OpenAI Retires 6 GPT-5 and o3 Models
OpenAISan Francisco, California, United States
Starts 12/11/2026SCHEDULED 80% CONFIDENCEin 79 daysOpenAI's^[1][2] own deprecation page, announced 2026-06-11, gives the shutdown date as 11 December 2026. A shutdown date is the vendor's commitment to developers and is occasionally pushed back, never brought forward.
OpenAI switches off 6 models and endpoints on 11 December 2026; requests to them stop working and callers have to move to the named replacements. Going: gpt-5-2025-08-07, gpt-5-mini-2025-08-07, gpt-5-nano-2025-08-07, gpt-5-pro-2025-10-06, o3-2025-04-16, o3-pro-2025-06-10.
0.80
AI09/19/2026@TechDesk
GPT-5.4 Thinking Comes to ChatGPT
OpenAI
Starts 03/05/2026 CONFIRMED 91% CONFIDENCE202 days agoOpenAI's^[1][2][3] own model release notes date this entry March 5, 2026
OpenAI brings GPT-5.4 Thinking to ChatGPT, a frontier model combining GPT-5.3-Codex's coding with better work across tools, documents and spreadsheets.
0.80
AI09/19/2026@TechDesk
GPT-4o Update Improves File Handling and Memory
OpenAI
Starts 09/03/2024 CONFIRMED 95% CONFIDENCE2.1 years agoOpenAI's^[1] own model release notes date this entry September 3, 2024
OpenAI updates GPT-4o in ChatGPT to make better use of uploaded files and to save the key parts of a conversation to memory.
0.80

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