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...
Developer
OpenAI
Release Date
March 3, 2026
Context Window
128,000 tokens≈ 171 words
API Access
Publicly AvailableIntegrate via official API
Input Cost
$1.75per million tokens
Output Cost
$14.00per million tokens
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