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OpenAI
Released March 2026
GPT-5.3 Chat
Conversational quality, accurate answers, natural flow
Tool Use
Vision
About this model
GPT-5.3 Chat is an update to ChatGPT's most-used model focused on improving conversational quality. It delivers more accurate answers with better contextualization and significantly reduces unnecessary refusals, caveats, and overly cautious phrasing that can interrupt conversational flow. It supports tool use, structured outputs, and native web search.
Context Window
128K
Input Cost
$1.75/M
Output Cost
$14/M
Input Types
Text, Image, File