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GPT-5.1-Codex-Max
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OpenAIOpenAIGPT Moderated

GPT-5.1-Codex-Max

400K context$1.25/M input$10.00/M output

GPT-5.1-Codex-Max is an AI model from OpenAI built for agent workflows, with support for text, image input and text output. 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...

What is GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max is an AI model from OpenAI that Agent Mag tracks for pricing, context window, modalities, benchmarks, and API compatibility. Builders can use this page to compare GPT-5.1-Codex-Max against other models for agent workflows and production deployments.

Model ID

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...

Modalities
Input
textimage
Output
text
Supported Parameters
include_reasoningmax_completion_tokensmax_tokensreasoningresponse_formatseedstructured_outputstool_choicetools

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