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openai/gpt-5.1-codex-max

GPT-5.1-Codex-Max is OpenAI’s latest agentic coding model, designed for long-running, high-context software development tasks. It is based on an updated version of the 5.1 reasoning stack and trained on agentic workflows...

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128K max outputVision
Input $1.25/M · Output $10.00/M · Cache read $0.13/M
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API details and access

Model Details

ProviderOpenAI
TypeLlm
Model IDopenai/gpt-5.1-codex-max

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-5.1-codex-max",
  "instructions": "You are a helpful assistant.",
  "input": "Hello",
  "max_output_tokens": 512
}

Pricing

Input$1.25 / 1M tokens
Output$10.00 / 1M tokens
Cache read$0.13 / 1M tokens

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