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openai/gpt-5.3-codex

GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. It ach...

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128K max outputVision
Input $1.75/M · Output $14.00/M · Cache read $0.18/M
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API details and access

Model Details

ProviderOpenAI
TypeLlm
Model IDopenai/gpt-5.3-codex

Capabilities

InputTextImage
OutputText
Context-
Max Output128,000
VisionSupported
Function CallingSupported

Access details

Responses API
Base URLhttps://api.sandbase.ai
API Endpoint/v1/responses
{
  "model": "openai/gpt-5.3-codex",
  "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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