OpenAI plans to launch GPT-5.1-Codex-Max for larger-scale projects, declaring that "Codex is now powered by GPT-5.1-Codex-Max, our latest frontier agentic coding model," claiming that the model is smarter, faster, and capable of performing long-running, project-scale than its predecessor coding work. This text mainly appears on personal social accounts, forum posts, and relayed screenshots, and is not from OpenAI's official blog, official website, or developer documentation, so it is a revelation in terms of source, rather than an official announcement that has been issued.
Compared with the information currently available to the public, OpenAI has clearly listed relevant models including GPT-5.1, GPT-5.1-codex, and GPT-5.1-codex-mini, among which GPT-5.1-codex has been officially positioned as an agent-based coding model for long-term, multi-step engineering tasks, which can handle large code repositories and project-level workflows. However, the name "GPT-5.1-Codex-Max" has not yet appeared in the model list, Codex official descriptions, and partner announcements, let alone the official wording "Codex has fully switched to GPT-5.1-Codex-Max drivers". Therefore, it is safer to judge that the description of "Codex-Max" and its specific capabilities should be considered unconfirmed advance news or internal planning rumors and will be subject to confirmation in subsequent official documents or announcements.
Frequently Asked Questions
Q: Is GPT-5.1-Codex-Max considered released now?
A: From the perspective of public channels, there is no official page or document listing this model, and it has only been mentioned in social platforms and communities, and cannot be regarded as an official release.
Q: Can the phrase "Codex is now powered by GPT-5.1-Codex-Max" be taken seriously?
A: This sentence currently only appears in personal posts or screenshots, and OpenAI's official page and Codex documentation do not state that Codex is powered by a certain "Codex-Max" model, so it is more likely to be an advance revelation of internal testing or planning rather than an official change that has already taken effect.
Q: What are the officially confirmed Codex-related models?
A: Officially listed include GPT-5.1 (general-purpose model), GPT-5.1-codex (for long-term agent-based coding scenarios), and GPT-5.1-codex-mini (smaller, cheaper version), which have appeared several times in documentation and partner announcements.
Q: Does the existing gpt-5.1-codex already support "big project, long work"?
A: Yes, GPT-5.1-codex itself is designed as an agent-based coding model that can run for a long time, handle multiple files and large codebases, and can perform multiple rounds of testing, refactoring, and integration tasks, covering most "project-scale" use cases.
Q: If GPT-5.1-Codex-Max is really available in the future, how should I confirm it immediately?
A: The most reliable way is to follow OpenAI's official website blog, model documentation, and official Codex pages, as well as updates from official partners such as GitHub Copilot and cloud services.
