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Abstract

GPT-5 is a unified system comprising high-throughput models (gpt-5-main) and deep reasoning models (gpt-5-thinking), managed by a real-time router that optimizes model selection based on complexity and intent. The system introduces "safe-completions" to replace binary refusals, aiming to improve helpfulness while maintaining safety. The model demonstrates significant advancements in reducing hallucinations and sycophancy, while implementing precautionary safeguards for high-capability risks in biological and chemical domains.