# GPT-4.1 nano

GPT-4.1 nano is an AI model released by OpenAI on Apr 14 2025. It has a 1M context window.

## Facts

| Field | Value |
| --- | --- |
| Model | GPT-4.1 nano |
| Developer | OpenAI |
| Release date | Monday, Apr 14 2025 |
| Licensing | Proprietary |
| Context window | 1M |

## API pricing

All rates in USD per 1,000,000 tokens, pay-as-you-go.

| Tier | Input | Cached input | Output |
| --- | --- | --- | --- |
| All documented contexts | $0.10 | $0.025 | $0.40 |

Verified August 18, 2026 against the first-party source: https://developers.openai.com/api/docs/models/gpt-4.1-nano

## Questions and answers

### 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.

### How much does GPT-4.1 nano cost?

GPT-4.1 nano costs $0.10 per million input tokens and $0.40 per million output tokens through the OpenAI API. Cached input is $0.025 per million tokens. Rates are pay-as-you-go API prices verified against OpenAI's published pricing on August 18, 2026.

### 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.


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Canonical page: https://aireleasetracker.com/model/openai/gpt-4.1-nano
Full dataset: https://aireleasetracker.com/llms-full.txt · JSON: https://aireleasetracker.com/models.json
Source: AI Release Tracker (https://aireleasetracker.com). Benchmark scores are the figures published by the releasing lab at launch.