OpenAI Legacy GPT and o-series snapshots
Shuts down October 23, 2026 — 60 days from today.
| Vendor | OpenAI |
|---|---|
| What ends | Legacy GPT and o-series snapshots |
| Announced | April 22, 2026 |
| Shutdown | October 23, 2026 |
| Notice given | 184 days |
| Replacement | gpt-5.6-sol, gpt-5.6-terra, gpt-5.6-luna depending on model |
| Source | Vendor documentation |
What is affected
- gpt-3.5-turbo
- gpt-4
- gpt-4-turbo
- gpt-4-1106-preview
- gpt-4.1-nano
- gpt-4o-2024-05-13
- gpt-image-1
- o1
- o1-pro
- o3-mini
- o4-mini
- fine-tuned variants
The largest single batch. Retires gpt-4 and gpt-3.5-turbo, plus fine-tuned models built on them, which cannot simply be repointed.
How to check whether this affects you
Search your codebase for the identifiers above. They commonly appear in environment variables and configuration files as well as in source, so grep your deployment config, not just your application code.
Find out before it breaks, not after
Stack Sunset watches the vendor announcement layer that dependency scanners miss — API sunsets, licence changes, pricing shifts — and tells you which of the things you depend on is about to stop working.
Watch on GitHub