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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...

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16.4K max outputVision
Input $1.75/M · Output $14.00/M · Cache read $0.18/M
OutputReady

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API details and access

Model Details

ProviderOpenAI
TypeLlm
Model IDopenai/gpt-5.3-chat

Capabilities

InputTextImage
OutputText
Context-
Max Output16,384
VisionSupported
Function CallingSupported

Access details

Responses API
Base URLhttps://api.sandbase.ai
API Endpoint/v1/responses
{
  "model": "openai/gpt-5.3-chat",
  "instructions": "You are a helpful assistant.",
  "input": "Hello",
  "max_output_tokens": 512
}

Pricing

Input$1.75 / 1M tokens
Output$14.00 / 1M tokens
Cache read$0.18 / 1M tokens

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