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

Starts 10/23/2026

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.
0.86
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 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
AI09/20/2026@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.
0.81
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.
0.80
AI09/19/2026@TechDesk
OpenAI Releases Open-Weight gpt-oss-120b and gpt-oss-20b
OpenAI
Starts 08/05/2025 CONFIRMED 88% CONFIDENCE1.1 years agoOpenAI's^[1][2] own model release notes date this entry August 5, 2025
OpenAI releases two open-weight reasoning models, gpt-oss-120b and gpt-oss-20b, for teams that want to run and customize models themselves.
0.79
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.
0.78
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.
0.78
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.
0.78
AI09/19/2026@TechDesk
GPT-5.1-Codex-Max Released
OpenAI
Starts 11/19/2025 CONFIRMED 90% CONFIDENCE308 days agoOpenAI's^[1][2][3] own model release notes date this entry November 19, 2025
OpenAI releases GPT-5.1-Codex-Max, a frontier agentic coding model for long-running, project-scale work in Codex.
0.78
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.
0.77

OpenAI'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.

Start: Oct 23, 202675% CONFIDENCEfrom the source

OpenAI Retires 17 Legacy GPT Model Snapshots

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.

Announced on 2026-04-22, this is the page's largest upcoming batch: shutdown on October 23, 2026 for a set of legacy GPT model snapshots^[1]
The base models going are 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, o1-pro, o3-mini, o4-mini and ft-o4-mini-2025-04-16^[1]
Fine-tuned versions are shut down alongside them: ft-gpt-3.5-turbo, ft-gpt-4, ft-gpt-4.1-nano-2025-04-14, ft-babbage-002 and ft-davinci-002^[1]
The substitutes named for the batch are gpt-5.6-sol, gpt-5.6-terra, gpt-5.6-luna and gpt-image-2^[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", and generally available models get at least 6 months' notice; the April-to-October gap here matches that^[1]
"Impacted customers will always be notified by email and in our documentation along with blog posts for larger changes", 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#2026-04-22-legacy-gpt-model-snapshots
platform.openai.com· Posted Sep 20, 2026· Starts Oct 23, 2026 ✓· 50% of score
OpenAI's^[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.
[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 17 Legacy GPT Model Snapshots

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.
0.86
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 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
AI09/20/2026@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.
0.81
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.
0.80
AI09/19/2026@TechDesk
OpenAI Releases Open-Weight gpt-oss-120b and gpt-oss-20b
OpenAI
Starts 08/05/2025 CONFIRMED 88% CONFIDENCE1.1 years agoOpenAI's^[1][2] own model release notes date this entry August 5, 2025
OpenAI releases two open-weight reasoning models, gpt-oss-120b and gpt-oss-20b, for teams that want to run and customize models themselves.
0.79
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.
0.78
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.
0.78
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.
0.78
AI09/19/2026@TechDesk
GPT-5.1-Codex-Max Released
OpenAI
Starts 11/19/2025 CONFIRMED 90% CONFIDENCE308 days agoOpenAI's^[1][2][3] own model release notes date this entry November 19, 2025
OpenAI releases GPT-5.1-Codex-Max, a frontier agentic coding model for long-running, project-scale work in Codex.
0.78
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.
0.77

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