Direct answer
The model’s human-readable name is OpenAI o3. Its API model ID is o3; OpenAI also lists the dated snapshot o3-2025-04-16. Both are marked deprecated and scheduled for removal from the API on December 11, 2026. As of November 12, 2026, that announced shutdown date is still in the future: deprecated does not mean already shut down. (developers.openai.com)
Name, API ID, and snapshot
| What you mean | Name |
|---|---|
| Human-readable model name | OpenAI o3, or o3 |
| API model ID | o3 |
| Dated snapshot | o3-2025-04-16 |
OpenAI explains that snapshots let you lock in a specific model version. Its o3 documentation lists both o3 and o3-2025-04-16 as deprecated. The announced API shutdown date applies to the o3 models scheduled in the deprecation notice. (developers.openai.com)
What this means for a production API
OpenAI’s o3 model page lists both the Chat Completions and Responses endpoints. In a Chat Completions request, the model identifier goes in the model field; OpenAI’s API reference gives o3 as an example model ID. (developers.openai.com)
If you already call o3, plan to migrate before December 11, 2026 and test a replacement against your own requirements. For a new integration, choose a model that is currently listed in OpenAI’s model catalog rather than starting with an identifier that is scheduled for shutdown. OpenAI’s deprecation guidance defines shutdown as the point when the model is no longer accessible. (developers.openai.com)
In short: search for “OpenAI o3” to find the model; use o3 as its API ID only while planning for the announced shutdown. Don’t mistake the dated snapshot for a way to avoid that shutdown—OpenAI lists it as deprecated too. (developers.openai.com)
Sources
Create chat completion | OpenAI API Reference