GPT-5 System Card introduces unified routing across gpt-5-main, gpt-5-thinking, and gpt-5-thinking-nano

AI Impact Summary

The GPT-5 System Card describes a unified model routing layer that dispatches requests to gpt-5-main for general use, gpt-5-thinking for reasoning-heavy tasks, and lightweight variants like gpt-5-thinking-nano for latency-sensitive workloads. This architecture enables task-appropriate model selection, potentially reducing response times and operational costs while sustaining result quality for complex prompts. Technical teams should plan for changes to client SDKs or middleware to leverage the routing layer and implement monitoring to compare per-model performance and accuracy across workloads.