Question 1

What is the cost of GPT-5.4 Nano by OpenRouter?

Accepted Answer

GPT-5.4 Nano by OpenRouter costs $0.0000 per 1M input tokens and $0.0000 per 1M output tokens. Cached reads cost $0.0000 per 1M tokens.

Question 2

What is the context window of GPT-5.4 Nano by OpenRouter?

Accepted Answer

GPT-5.4 Nano by OpenRouter has a context window of 400K tokens. It supports up to 400K input tokens and can generate up to 128K output tokens.

Question 3

What are the capabilities of GPT-5.4 Nano by OpenRouter?

Accepted Answer

GPT-5.4 Nano by OpenRouter supports tool calling/function calling, structured output, adjustable temperature, file attachments. It has closed weights.

Question 4

What input and output types does GPT-5.4 Nano support?

Accepted Answer

GPT-5.4 Nano by OpenRouter accepts text, image, pdf as input and can generate text as output.

Question 5

Is GPT-5.4 Nano by OpenRouter open source?

Accepted Answer

No, GPT-5.4 Nano by OpenRouter has closed weights. The model is only available through the OpenRouter API.

Question 6

Does GPT-5.4 Nano support function calling?

Accepted Answer

Yes, GPT-5.4 Nano by OpenRouter supports tool calling (also known as function calling), allowing it to interact with external tools and APIs during conversations.

Question 7

What is the knowledge cutoff date for GPT-5.4 Nano?

Accepted Answer

GPT-5.4 Nano by OpenRouter has a knowledge cutoff date of 2025-08-31. This means the model was trained on data available up until that date.

GPT-5.4 Nano API

Input Modalities

Output Modalities

Standard (per 1M tokens)

Caching (per 1M tokens)