OpenAI: GPT-5.3 Chat

GPT-5.3 Chat, released by OpenAI on March 3, 2026, is designed to enhance conversational AI experiences. This model consistently performs among the fastest models, ranking in the 65th percentile for speed across various benchmarks. However, it is positioned at premium pricing levels, falling into the 13th percentile for cost. A standout feature is its exceptional reliability, demonstrating a 100% success rate across all evaluated benchmarks, indicating minimal technical failures. The model exhibits remarkable accuracy across several critical categories. It achieved perfect scores in General Knowledge and Ethics, with the latter also being the most accurate model at its price point and speed. Its ability to appropriately acknowledge uncertainty in the Hallucinations benchmark is strong at 98.0% accuracy. GPT-5.3 Chat also excels in complex tasks, achieving 94.0% in Mathematics, 92.0% in Instruction Following (96th percentile), 98.0% in Reasoning (90th percentile), and an impressive 98.0% in Coding (99th percentile). While its Email Classification accuracy is solid at 98.0%, it ranks in the 55th percentile for this specific task. Overall, its key strengths lie in its high accuracy across diverse and challenging domains, coupled with robust reliability, though at a premium price point.