Addendum to GPT-5.2 System Card: GPT-5.2-Codex

OpenAI released an addendum to the GPT-5.2 system card introducing GPT-5.2-Codex. This update focuses on enhanced code generation capabilities. It matters because it improves developer productivity and coding assistance.

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PublishedThursday, December 18, 2025 at 1:00 AMDec 18, 01:00 AM

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This system card outlines the comprehensive safety measures implemented for GPT‑5.2-Codex. 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‑5.2‑Codex is our most advanced agentic coding model yet for complex, real-world software engineering. A version of GPT‑5.2⁠ optimized for agentic coding in Codex, it includes further improvements on long-horizon work through context compaction, stronger performance on project-scale tasks like refactors and migrations, and improved performance in Windows environments—and significantly stronger cybersecurity capabilities.

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Addendum to GPT-5.2 System Card: GPT-5.2-Codex

Original article excerpt