GPT-5.3 Chat
by OpenAItext+image+file->text2 endpoints
Overview
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...
Capabilities
Text generation
Image understanding
Tool use / Function calling
Structured output
Prompt caching
Long context
File input
Deterministic seed
Modalities
Input
TextImageFile
Output
Text
Technical Specifications
Context Window
128K tokens
Max Output
16.4K tokens
Tokenizer
GPT
Content Moderation
Enabled
Uptime (24h)
9999.3%
Supported Parameters
max_completion_tokensmax_tokensresponse_formatseedstructured_outputstool_choicetools