GPT-5.5 Instant System Card capability — prebuilt system prompts for consistent behavior

AI Impact Summary

GPT-5.5 Instant System Card introduces a dedicated capability to apply predefined system-level prompts via a System Card, enabling consistent behavior across calls and faster initialization for new deployments. This will change how deployments configure model behavior, since teams can reference a card rather than composing per-call prompts, tightening policy enforcement and reducing boilerplate. Organizations should plan a migration to card-based initialization, validate card versions across environments, and monitor for drift in outputs as cards are updated.