# GPT-4.1 nano

> GPT-4.1 nano is a proprietary language model from OpenAI, released on 14 Apr 2025. It accepts text and images and generates text, with a 1M-token context window and up to 33K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $0.10 per million input tokens and $0.40 per million output tokens (OpenRouter), across 2 providers we track. OpenAI has deprecated this model.

Source page: https://www.aimodel.directory/models/gpt-4-1-nano
Last verified: 4 Oct 2026

## Specifications

- **Developer:** OpenAI
- **Release date:** 14 Apr 2025 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-4.1-nano.toml)
- **Status:** Deprecated (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-4.1-nano.toml)
- **Weights:** Proprietary (API only) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-4.1-nano.toml)
- **Context window:** 1M (1,047,576 tokens) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-4.1-nano.toml)
- **Max output:** 33K tokens (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-4.1-nano.toml)
- **Knowledge cutoff:** Apr 2024 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-4.1-nano.toml)
- **Input:** Text and images (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-4.1-nano.toml)
- **Output:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-4.1-nano.toml)
- **Reasoning mode:** No (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-4.1-nano.toml)
- **Tool calling:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-4.1-nano.toml)
- **Structured output:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/openai/models/gpt-4.1-nano.toml)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| OpenRouter | $0.10 | $0.40 | $0.03 | 1M |
| Vercel AI Gateway | $0.20 | $0.80 | $0.05 | 1M |

## FAQ

### What is the context window of GPT-4.1 nano?

GPT-4.1 nano has a context window of 1,047,576 tokens (1M) and can generate up to 32,768 tokens in a single response, according to models.dev.

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

GPT-4.1 nano is listed from $0.10 per million input tokens and $0.40 per million output tokens (OpenRouter). Prices last verified 4 Oct 2026.

### Is GPT-4.1 nano open source?

No. GPT-4.1 nano is a proprietary model; OpenAI has not released its weights. It is available through APIs including OpenRouter, Vercel AI Gateway.

### When was GPT-4.1 nano released?

OpenAI released GPT-4.1 nano on 14 Apr 2025, according to models.dev.

### Which providers offer GPT-4.1 nano?

We track GPT-4.1 nano on 2 providers: OpenRouter, Vercel AI Gateway.

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Data licensed CC BY 4.0. Cite as: AI Model Directory, "GPT-4.1 nano", https://www.aimodel.directory/models/gpt-4-1-nano