OpenAI releases coding-oriented AI 'GPT-5.1-Codex-Max,' automatically compressing long context to complete tasks
OpenAI released GPT-5.1-Codex-Max , an AI model specialized for coding tasks, on Wednesday, November 19, 2025. GPT-5.1-Codex-Max offers higher performance at a lower cost than
Building more with GPT-5.1-Codex-Max | OpenAI
https://openai.com/index/gpt-5-1-codex-max/
GPT-5.1-Codex-Max is a model that can be used with the coding agent Codex. It is unique in that it has been trained taking into account Windows user operations.
GPT-5.1-Codex-Max allows you to choose from four levels of thinking time: 'low,' 'medium,' 'high,' and 'xhigh.' The graph below shows the performance of GPT-5.1-Codex-Max (blue) and GPT-5.1-Codex (light blue) for each number of thinking tokens. It can be seen that GPT-5.1-Codex-Max performs better with fewer thinking tokens than GPT-5.1-Codex-Max in all three levels: 'low,' 'medium,' and 'high.' Additionally, while GPT-5.1-Codex-Max's 'xhigh' setting significantly increases the number of thinking tokens, its performance also increases accordingly.
Below is a graph comparing the benchmark results of GPT-5.1-Codex(high) and GPT-5.1-Codex-Max(xhigh). GPT-5.1-Codex-Max(xhigh) recorded higher scores in both
OpenAI has also published the results of inputting the following 'prompt for creating a Kanban-style task management tool' into GPT-5.1-Codex and GPT-5.1-Codex-Max.
Give me a work management platform that helps teams organize, track, and manage their projects and tasks. Give me the platform with a kanban board, not the landing page. Give me some initial tasks and data already prepopulated so I can see how it looks. Make sure I can create new tasks, and drag them around. Make it look and feel like a fully featured work management/Kanban app.
Save to index.html
First, the task management tool output by GPT-5.1-Codex is below.
And the output of GPT-5.1-Codex-Max is below. GPT-5.1-Codex-Max is visually superior and also has delete and edit buttons.
GPT-5.1-Codex-Max has a context compression feature to solve the problem of reaching the context window limit and failing the task, which is a common problem for coding agents. If the context grows and approaches the limit during task processing, it automatically performs context compression to allow the task to proceed to completion.
GPT-5.1-Codex-Max is available to ChatGPT users with Plus, Pro, Business, Edu, and Enterprise subscriptions. The API will also be released soon.
Related Posts:
in AI, Posted by log1o_hf