GPT-5 System Card

GPT-5.5 System Card

GPT-5.4 Thinking System Card

Addendum to GPT-5 system card: GPT-5-Codex

This addendum to the GPT-5 system card shares a new model: GPT-5-Codex, a version of GPT-5 further optimized for agentic coding in Codex. GPT-5-Codex adjusts its thinking effort more dynamically based on task complexity, responding quickly to simple conversational queries or small tasks, while independently working for longer on more complex tasks.

GPT-5.5 Instant System Card

GPT-5.3-Codex System Card

GPT‑5. 3-Codex is the most capable agentic coding model to date, combining the frontier coding performance of GPT‑5.

GPT-5.1 Instant and GPT-5.1 Thinking System Card Addendum

This GPT-5 system card addendum provides updated safety metrics for GPT-5. 1 Instant and Thinking, including new evaluations for mental health and emotional reliance.

GPT-5.3 Instant System Card

Introducing GPT-5.5

Introducing GPT-5. 5, our smartest model yet—faster, more capable, and built for complex tasks like coding, research, and data analysis across tools.

GPT-5.1-Codex-Max System Card

This system card outlines the comprehensive safety measures implemented for GPT‑5. 1-CodexMax.

Introducing GPT-5.4 mini and nano

GPT-5. 4 mini and nano are smaller, faster versions of GPT-5.

GPT-4o System Card

Update to GPT-5 System Card: GPT-5.2

GPT-5. 2 is the latest model family in the GPT-5 series.