Question 1

What is the cost of GPT-5.1 by OpenRouter?

Accepted Answer

GPT-5.1 by OpenRouter costs $1.25 per 1M input tokens and $10.00 per 1M output tokens. Cached reads cost $0.13 per 1M tokens.

Question 2

What is the context window of GPT-5.1 by OpenRouter?

Accepted Answer

GPT-5.1 by OpenRouter has a context window of 400K tokens. It supports up to 272K input tokens and can generate up to 128K output tokens.

Question 3

What are the capabilities of GPT-5.1 by OpenRouter?

Accepted Answer

GPT-5.1 by OpenRouter supports advanced reasoning, tool calling/function calling, structured output, file attachments. It has closed weights.

Question 4

What input and output types does GPT-5.1 support?

Accepted Answer

GPT-5.1 by OpenRouter accepts image, text, pdf as input and can generate text as output.

Question 5

Does GPT-5.1 by OpenRouter support reasoning?

Accepted Answer

Yes, GPT-5.1 by OpenRouter supports advanced reasoning capabilities.

Question 6

Is GPT-5.1 by OpenRouter open source?

Accepted Answer

No, GPT-5.1 by OpenRouter has closed weights. The model is only available through the OpenRouter API.

Question 7

Does GPT-5.1 support function calling?

Accepted Answer

Yes, GPT-5.1 by OpenRouter supports tool calling (also known as function calling), allowing it to interact with external tools and APIs during conversations.

Question 8

What is the knowledge cutoff date for GPT-5.1?

Accepted Answer

GPT-5.1 by OpenRouter has a knowledge cutoff date of 2024-09-30. This means the model was trained on data available up until that date.

GPT-5.1 API

Input Modalities

Output Modalities

Standard (per 1M tokens)

Caching (per 1M tokens)