GPT-4.1 nano
GPT-4.1 nano is an AI model released by OpenAI on Monday, Apr 14 2025, the same day as GPT-4.1 mini. It has a 1M token context window.
GPT-4.1 nano — frequently asked questions
- When was GPT-4.1 nano released?
- GPT-4.1 nano was released by OpenAI on Monday, Apr 14 2025.
- Who made GPT-4.1 nano?
- GPT-4.1 nano was built by OpenAI. Creators of ChatGPT and the GPT series of models. Pioneered large-scale language model research.
- What is the context window of GPT-4.1 nano?
- GPT-4.1 nano has a context window of 1M. That is the maximum amount of input plus output the model can hold in a single request.
- Is GPT-4.1 nano open source?
- No. GPT-4.1 nano 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-4.1 nano?
- OpenAI's previous tracked release was GPT-4.1 mini on Apr 14 2025. It was followed by o3 on Apr 16 2025.