GPT-4.1 nano
Summary
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.
Tiny GPT-4.1 option for classification, routing, and very high-volume tasks
Last verified 4 Oct 2026. Every figure on this page links to its source.
Specifications
| Developer | OpenAI |
|---|---|
| Release date | 14 Apr 2025 [models.dev] |
| Status | Deprecated [models.dev] |
| Weights | Proprietary (API only) [models.dev] |
| Context window | 1M (1,047,576 tokens) [models.dev] |
| Max output | 33K tokens [models.dev] |
| Knowledge cutoff | Apr 2024 [models.dev] |
| Input | Text and images [models.dev] |
| Output | Text [models.dev] |
| Reasoning mode | No [models.dev] |
| Tool calling | Yes [models.dev] |
| Structured output | Yes [models.dev] |
GPT-4.1 nano API pricing by provider
USD per million tokens. Sorted by input price.
| Provider | Input | Output | Cached input | Context | Source |
|---|---|---|---|---|---|
| OpenRouter openai/gpt-4.1-nano | $0.10 | $0.40 | $0.03 | 1M | OpenRouter, 4 Oct 2026 |
| Vercel AI Gateway openai/gpt-4.1-nano-fast | $0.20 | $0.80 | $0.05 | 1M | models.dev, 4 Oct 2026 |
Frequently asked questions
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.
Change history
No changes detected since we started tracking this model. We re-check every source daily.