## Models
### New Features
- Use the new GPT-5.4 model, OpenAI's best model for broad
general-purpose work. Control how long the model spends thinking in
Advanced Options. Set reasoning effort to none for the non-thinking
version of this model.
- Use GPT-5.3 Chat, which points to the GPT-5.3 snapshot currently used
in ChatGPT. We recommend GPT-5.4 for most assistants. Control how long
the model spends thinking in Advanced Options.

### Updates & Improvements
- Use eligible models with tools when reasoning is set to 'none' for
quicker responses.
- A "Newer models available" notice appears when not using the latest
Latest or Pinned model.
- Updates to helper language to clarify that Latest models move to the
newest release within the same model family.
- Added "More models above" notice within the model selector to ensure
users can see all models.

### Resolved Issues
- Fixed: Some unavailable models may appear in the model selector when
using Azure as the AI provider. ]

### Deprecations
- The following models are now considered legacy and are not available
for selection in new assistants:
- Latest models: gpt-5.2, gpt-4o, gpt-realtime-mini,
gpt-4o-realtime-preview, gpt-4o-mini-realtime-preview.
- Pinned models: gpt-5.2-2025-12-11, gpt-5.2-chat-latest,
gpt-5.1-2025-11-13, gpt-5.1-chat-latest, gpt-5-2025-08-07,
gpt-5-mini-2025-08-07, gpt-4.1-mini-2025-04-14, gpt-4o-2024-11-20,
gpt-4o-2024-08-06, gpt-4o-mini-2024-07-18, gpt-realtime-mini-2025-10-06,
gpt-4o-realtime-preview-2024-12-17, gpt-4o-realtime-preview-2024-10-01,
gpt-4o-mini-realtime-preview-2024-12-17.