How many parameters does GPT-5.1 Chat have?

Parameter count for GPT-5.1 Chat is not available. See the Hugging Face model page for full specifications.

Who created GPT-5.1 Chat?

GPT-5.1 Chat was published by OpenAI on Hugging Face.

GPT-5.1 Chat

Name: GPT-5.1 Chat
Author: OpenAI

Multimodalby OpenAI·Model page ↗

OpenAI's chat-optimized multimodal model with file and image support and a 128K-token context.

Max output

Most tokens the model can return in a single response.

16Ktokens

Pricing

per 1M tokens

Input$1.25 /1M

Output$10 /1M

Cache read$0.125 /1M

Web search$0.01

Model Description

GPT-5.1 Chat (AKA Instant is the fast, lightweight member of the 5.1 family, optimized for low-latency chat while retaining strong general intelligence. It uses adaptive reasoning to selectively “think” on...

Author

OpenAI

Organization · ✓

openai

Details

Downloads—

Likes—

AccessClosed Source

Context128K tokens

Input price$1.25 /1M

Output price$10 /1M

CreatedNov 13, 2025

Updated—

View on Hugging Face

Get the full context.