GPT-5.5 adds Instant System Card capability for rapid system prompts

AI Impact Summary

GPT-5.5 introduces an Instant System Card capability, enabling clients to apply a predefined system configuration quickly across sessions. This matters for teams enforcing governance, safety policies, or domain-specific constraints, as it reduces the need to embed system prompts in every request. The business impact is faster rollout of consistent AI behavior and policy updates across apps, but teams should align payload formats with existing System Card usage to avoid conflicts and ensure backward compatibility.