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openai

OpenAI: GPT-5.3 Chat

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...

openai/gpt-5.3-chat

Context Size

128K

Input Price

262,500 pts/M

Output Price

2,100,000 pts/M


Architecture

Text
Image
File

Supported Parameters

max_completion_tokensmax_tokensresponse_formatseedstructured_outputstool_choicetools

Details

TokenizerGPT
Max Completion16,384 tokens
Provider Context128K tokens
ModeratedNo
CreatedMar 3, 2026