tech
December 20, 2025
Addendum to GPT-5.2 System Card: GPT-5.2-Codex
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.
TL;DR
- GPT‑5.2-Codex is an advanced agentic coding model for complex software engineering.
- Improvements include context compaction for long-horizon work and better performance on project-scale tasks.
- Enhanced capabilities in Windows environments and significantly stronger cybersecurity.
- Safety measures include specialized training for harmful tasks and prompt injections, agent sandboxing, and configurable network access.
- Evaluated under the Preparedness Framework, it shows high capability in cybersecurity but has not reached 'High' capability.
- Models are expected to reach the 'High' cybersecurity threshold in the near future.
- Treated as High capability in biology, with corresponding safeguards for the GPT‑5 family.
- Does not reach High capability on AI self-improvement.
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