GPT-5.5 Instant System Card capability introduced

AI Impact Summary

GPT-5.5 now exposes an Instant System Card capability, enabling per-call configuration of model behavior and governance controls. This allows services to enforce prompts, constraints, or routing policies on a per-request basis without code changes, accelerating experimentation and policy compliance. Teams should update integrations to pass system-card payloads, adjust logging to capture card contents, and review security boundaries to prevent leakage of sensitive prompts.