# GPT-4.5

GPT-4.5 is an AI model released by OpenAI on Feb 27 2025.

## Facts

| Field | Value |
| --- | --- |
| Model | GPT-4.5 |
| Developer | OpenAI |
| Release date | Thursday, Feb 27 2025 |
| Licensing | Proprietary |

## Questions and answers

### When was GPT-4.5 released?

GPT-4.5 was released by OpenAI on Thursday, Feb 27 2025.

### Who made GPT-4.5?

GPT-4.5 was built by OpenAI. Creators of ChatGPT and the GPT series of models. Pioneered large-scale language model research.

### Is GPT-4.5 open source?

No. GPT-4.5 is a proprietary model. The weights are not published — it is available only through the provider's own API, apps, or partner platforms.

### What came before and after GPT-4.5?

OpenAI's previous tracked release was o3-mini-high on Jan 31 2025, 27 days earlier. It was followed by o1-pro on Mar 19 2025.


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Canonical page: https://aireleasetracker.com/model/openai/gpt-4.5
Full dataset: https://aireleasetracker.com/llms-full.txt · JSON: https://aireleasetracker.com/models.json
Source: AI Release Tracker (https://aireleasetracker.com). Most benchmark scores come from lab launch material; gathered results identify the leaderboard that published them.