OpenAI: GPT-5.3 Chat

Tool Calling Attachments

GPT-5.3 Chat is an update to ChatGPT's most-used model that makes everyday conversations smoother, more useful, and more directly helpful. It delivers more accurate answers with better contextualization and significantly...

Providers 1

Released Mar 4, 2026

Input Modalities image, pdf, text

Output Modalities text

Tarsk Use coding

Available Providers (1)

Provider	Model ID	Input Cost	Output Cost	Context	Max Output	Docs
Kilo Gateway	`openai/gpt-5.3-chat`	$1.75/MTok	$14.00/MTok	128K	16.4K

Capabilities

Reasoning

Tool Calling

Attachments

Open Weights

Structured Output