GPT-5.3 Chat

Chat Completions

gpt-5.3-chat

OpenAI|Created Mar 4, 2026|128k context

Chat Completions

GPT-5.3 Chat is an updated version of ChatGPT’s most widely used model, designed to make everyday conversations smoother, more practical, and more directly helpful. It provides more accurate answers with stronger context awareness and noticeably cuts down on unnecessary refusals, excessive caveats, and overly cautious wording that can disrupt the flow of conversation.

Overview Specifications Activity Performance Uptime Examples

Pricing-50%

Pay-as-you-go rates for this model. More details can be found here.

Input Tokens (1M)

$0.88

Cached Input Tokens (1M)

$0.09

Output Tokens (1M)

$7.00

Capabilities

Input Modalities

TextImageFile

Output Modalities

Text

Supported Parameters

Available parameters for API requests

Frequency PenaltyFunction CallFunctionsLogit BiasMax Completion TokensParallel Tool CallsPredictionPresence PenaltyReasoning EffortResponse FormatStopTool ChoiceToolsWeb Search Options