GPT-5.1-Codex-Max System Card

OpenAI released the GPT-5.1-Codex-Max system card detailing the capabilities and improvements of their latest large language model. This update enhances code generation and understanding, making it more efficient for developers. The release matters because it advances AI-assisted programming and software development tools.

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PublishedWednesday, November 19, 2025 at 1:00 AMNov 19, 01:00 AM

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This system card outlines the comprehensive safety measures implemented for GPT‑5.1-CodexMax. It details both model-level mitigations, such as specialized safety training for harmful tasks and prompt injections, and product-level mitigations like agent sandboxing and configurable network access.

GPT‑5.1‑Codex‑Max is our new frontier agentic coding model. It is built on an update to our foundational reasoning model trained on agentic tasks across software engineering, math, research, medicine, computer use and more. It is our first model natively trained to operate across multiple context windows through a process called compaction, coherently working over millions of tokens in a single task. Like its predecessors, GPT‑5.1‑Codex‑Max was trained on real-world software engineering tasks like PR creation, code review, frontend coding and Q&A.

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GPT-5.1-Codex-Max System Card

Original article excerpt