GPT-5.1-CODEX-MAX
OpenAI's GPT-5.1-CODEX-MAX is a chat model capable of handling a wide range of tasks, including code completion, generation, and review, as well as extended thinking and tool use. It is particularly suited for applications that require processing large amounts of context, thanks to its extensive context window of 272,000 tokens.
Input
Output
Context
272K
Max Output
128K
Parameters
-
Technical Specifications
Model TypeCode
Context Window272,000 tokens
Max Output Tokens128,000 tokens
ParametersNot available
Release DateNov 20, 2025
Training CutoffSep 30, 2024
Licenseproprietary
Open SourceNo
Input Modalities
ImageText
Output Modalities
Text
Capabilities
Resources & Links
proprietary, Proprietary - API access only
Related Tools
Data sourced from official provider APIs and documentation
Last updated: Jun 23, 2026
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