OpenAI: GPT-5.1 Chat

Tool Calling Attachments

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...

Providers 2

Released Jan 1, 2025

Input Modalities image, pdf, text

Output Modalities text, image

Tarsk Use coding

Available Providers (2)

Provider	Model ID	Input Cost	Output Cost	Context	Max Output	Docs
Kilo Gateway	`openai/gpt-5.1-chat`	$1.25/MTok	$10.00/MTok	128K	16.4K
Helicone	`gpt-5.1-chat-latest`	$1.25/MTok	$10.00/MTok	128K	16.4K

Capabilities

Reasoning

Tool Calling

Attachments

Open Weights

Structured Output