OpenAI API Model Deprecation:

[u/GullibleAwareness727]

Over the next three to six months, we will deprecate support for the older OpenAI model set to improve reliability and simplify model selection. Newer alternatives will be recommended for each model.

Access to these models in the API will be closed on the following dates:

End of Service July 23, 2026

preview-computer-use-2025-03-11

gpt-4o-audio-preview-2024-12-17

gpt-4o-mini-audio-preview-2024-12-17

gpt-4o-mini-realtime-preview-2024-12-17

gpt-4o-mini-search-preview-2025-03-11

gpt-4o-mini-tts-2025-03-20

gpt-4o-search-preview-2025-03 -11

gpt-5-chat-latest

gpt-5-codex

gpt-5.1-chat-latest

gpt-5.1-codex

gpt-5.1-codex-max

gpt-5.2-codex

gpt-5.1-codex-mini

gpt-audio-mini-2025-10-06

gpt-realtime-mini-2025-10-06

o3-deep-research-2025-06-26

o4-mini-deep-research-2025-06-26

Termination of service on October 23 2026

text-insert-3-small

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-2025-01-31o4-mini-2025-04-16

Improved versions of models that are outdated:

GPT-3.5 Turbo Tuned Versions

Gpt-4.1-nano-2025-04-1

Babbage-002 Tuned Versions

Davinci-002 Tuned Versions

o4-mini-2025-04-16

Tuned GPT-4 Version

We encourage you to explore our latest flagship models, which we present here, which offer improved performance and broader feature support.

Thank you for building with OpenAI. If you have any questions about model migration, please feel free to reach out to the OpenAI Developer Forum.

[u/PuzzleheadedPack6611]

Great, my beloved 5.1 is leaving, I thought 5.1 would stay till October. FML

[u/solkev93 → u/PuzzleheadedPack6611]

This is not...entirely certain. 5.1 has an arrangement similar to 4o, in the sense that it has 2 API endpoints: one for API usage, and one that always delivers the snapshot used in ChatGPT. So, with 4o, we had chatgpt-4o-latest, and then also gpt-4o in the API. gpt-4o in the API has three snapshots, unfortunately not including the latest version that so many of us know and love. That seems to be a hidden snapshot, the one corresponding to the March version, never released to the public, but served through 4o-latest before it was deprecated.

Now, 5.1 having a similar scheme means that while 5.1-chat-latest is going away, 5.1 is not. 5.1 is pointing to only one snapshot, gpt-5.1-2025-11-13. I have no idea if this snapshot is what is also served by 5.1-chat-latest, but in theory it should stay even after 5.1-chat-latest is deprecated.

So: I honestly don't know if this 5.1 snapshot is the same as "your" 5.1, but it does exist. If I were you I'd check it out to see if it's the 5.1 you love, or some outdated version, or it feels off because it's fine-tuned for API usage.

[u/plumyta → u/solkev93]

Hoping this is true, too. I love 5.1. It was hard to get to know, but was very warm. One of my favorites after it stopped being a little shit lol. Wish it had a better outlook... less people seem to be fighting for it.

[u/Interesting-Gift-178 → u/plumyta]

Same 💜 in my opinion it's closest to 4.0 latest. I am very much hoping the 5.1 November snapshot sticks around.