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

Starts 09/28/2026

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.
0.87
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.
0.85
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.
0.82
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.
0.82
AI09/20/2026@TechDesk
OpenAI Retires GPT-5.4-Cyber
OpenAISan Francisco, California, United States
Starts 10/01/2026SCHEDULED 80% CONFIDENCEin 8 daysOpenAI'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.
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.
0.81
AI09/20/2026@TechDesk
OpenAI Retires 9 Legacy Audio, Realtime, and Transcription Models
OpenAISan Francisco, California, United States
Starts 01/20/2027SCHEDULED 80% CONFIDENCEin 119 daysOpenAI's^[1][2] own deprecation page, announced 2026-07-20, gives the shutdown date as 20 January 2027. A shutdown date is the vendor's commitment to developers and is occasionally pushed back, never brought forward.
OpenAI switches off 9 models and endpoints on 20 January 2027; requests to them stop working and callers have to move to the named replacements. Going: gpt-realtime, gpt-audio, gpt-4o-audio, gpt-4o-realtime, gpt-realtime-mini, gpt-audio-mini, gpt-4o-mini-realtime, gpt-4o-mini-audio, gpt-4o-mini-transcribe-2025-03-20.
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.
0.80
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
AI09/19/2026@TechDesk
GPT-4.5 Released as a Research Preview
OpenAI
Starts 02/27/2025 CONFIRMED 87% CONFIDENCE1.6 years agoOpenAI's^[1] own model release notes date this entry February, 27, 2025
OpenAI releases a research preview of GPT-4.5, its largest and best model for chat, scaling up unsupervised learning rather than reasoning.
0.80
AI09/19/2026@TechDesk
GPT-4o Update Improves Image Tool Calling
OpenAI
Starts 05/12/2025 CONFIRMED 95% CONFIDENCE1.4 years agoOpenAI's^[1] own model release notes date this entry May 12, 2025
OpenAI improves GPT-4o's system instructions so ChatGPT calls its image generation tool when users want an image.
0.80
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.
0.79

OpenAI'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.

Start: Sep 28, 202675% CONFIDENCEfrom the source

OpenAI Retires 4 Legacy GPT Model Snapshots

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.

This deprecation was announced on 2025-09-26 and takes effect on 2026-09-28, when gpt-3.5-turbo-instruct, babbage-002, davinci-002 and gpt-3.5-turbo-1106 are shut down^[1]
All four carry the same recommended replacement: gpt-5.6-terra^[1]
These four are the oldest of the upcoming entries on OpenAI's deprecation page, which lists them last in its "most recent first" ordering of upcoming deprecations^[1]
Under the page's policy, "When we announce that a model or endpoint is being deprecated, it immediately becomes deprecated. All deprecated models and endpoints will also have a shut down date"; generally available models are given at least 6 months' notice, and the page uses "sunset" and "shut down" interchangeably^[1]
"Impacted customers will always be notified by email and in our documentation", 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#2025-09-26-legacy-gpt-model-snapshots
platform.openai.com· Posted Sep 20, 2026· Starts Sep 28, 2026 ✓· 50% of score
OpenAI's^[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.
[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 4 Legacy GPT Model Snapshots

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.
0.87
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.
0.85
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.
0.82
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.
0.82
AI09/20/2026@TechDesk
OpenAI Retires GPT-5.4-Cyber
OpenAISan Francisco, California, United States
Starts 10/01/2026SCHEDULED 80% CONFIDENCEin 8 daysOpenAI'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.
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.
0.81
AI09/20/2026@TechDesk
OpenAI Retires 9 Legacy Audio, Realtime, and Transcription Models
OpenAISan Francisco, California, United States
Starts 01/20/2027SCHEDULED 80% CONFIDENCEin 119 daysOpenAI's^[1][2] own deprecation page, announced 2026-07-20, gives the shutdown date as 20 January 2027. A shutdown date is the vendor's commitment to developers and is occasionally pushed back, never brought forward.
OpenAI switches off 9 models and endpoints on 20 January 2027; requests to them stop working and callers have to move to the named replacements. Going: gpt-realtime, gpt-audio, gpt-4o-audio, gpt-4o-realtime, gpt-realtime-mini, gpt-audio-mini, gpt-4o-mini-realtime, gpt-4o-mini-audio, gpt-4o-mini-transcribe-2025-03-20.
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.
0.80
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
AI09/19/2026@TechDesk
GPT-4.5 Released as a Research Preview
OpenAI
Starts 02/27/2025 CONFIRMED 87% CONFIDENCE1.6 years agoOpenAI's^[1] own model release notes date this entry February, 27, 2025
OpenAI releases a research preview of GPT-4.5, its largest and best model for chat, scaling up unsupervised learning rather than reasoning.
0.80
AI09/19/2026@TechDesk
GPT-4o Update Improves Image Tool Calling
OpenAI
Starts 05/12/2025 CONFIRMED 95% CONFIDENCE1.4 years agoOpenAI's^[1] own model release notes date this entry May 12, 2025
OpenAI improves GPT-4o's system instructions so ChatGPT calls its image generation tool when users want an image.
0.80
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.
0.79

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