Question 1

What is the cost of GPT-5.1-Codex by GitHub Copilot?

Accepted Answer

GPT-5.1-Codex by GitHub Copilot costs Free per 1M input tokens and Free per 1M output tokens.

Question 2

What is the context window of GPT-5.1-Codex by GitHub Copilot?

Accepted Answer

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

Question 3

What are the capabilities of GPT-5.1-Codex by GitHub Copilot?

Accepted Answer

GPT-5.1-Codex by GitHub Copilot supports advanced reasoning, tool calling/function calling. It has closed weights.

Question 4

What input and output types does GPT-5.1-Codex support?

Accepted Answer

GPT-5.1-Codex by GitHub Copilot accepts text, image as input and can generate text as output.

Question 5

Does GPT-5.1-Codex by GitHub Copilot support reasoning?

Accepted Answer

Yes, GPT-5.1-Codex by GitHub Copilot supports advanced reasoning capabilities.

Question 6

Is GPT-5.1-Codex by GitHub Copilot open source?

Accepted Answer

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

Question 7

Does GPT-5.1-Codex support function calling?

Accepted Answer

Yes, GPT-5.1-Codex by GitHub Copilot 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-Codex?

Accepted Answer

GPT-5.1-Codex by GitHub Copilot 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-Codex API

Input Modalities

Output Modalities

Standard (per 1M tokens)