AI BriefingGPT-5 System Card Addendum: GPT-5-Codex
Key point
OpenAI has released a system card addendum detailing the safety measures for GPT-5-Codex, optimized for coding agent tasks.
Details
GPT-5-Codex is a GPT-5 model optimized to perform agentic coding within the Codex environment. Like its predecessor codex-1, it was trained via Reinforcement Learning on real-world coding tasks across a variety of environments.
The model reflects human coding styles and PR preferences, and has the ability to follow instructions precisely and iteratively run code until tests pass.
Users can access the model through the following paths:
- Local: Terminal or IDE via Codex CLI and IDE extensions
- Cloud: Codex web, GitHub, ChatGPT mobile app
This addendum covers comprehensive safety measures at both the model and product levels.
- Model level: Specialized safety training to prevent harmful tasks and Prompt Injection
- Product level: Agent Sandboxing and configurable network access controls
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