OpenAI: GPT-5.5

OpenAI's GPT-5.5, created on April 24, 2026, is a frontier model designed for complex professional workloads, featuring a 1M+ token context length. It performs among the fastest models, typically ranking in the top tier for speed (63rd percentile). However, it is positioned at premium pricing levels (9th percentile). GPT-5.5 demonstrates exceptional reliability, achieving a perfect 100% success rate across all 8 benchmarks, indicating minimal technical failures. The model exhibits outstanding performance in critical areas such as General Knowledge, Reasoning, and Ethics, achieving perfect 100% accuracy in all three, often being the most accurate model at its price point and speed. It also shows strong capabilities in Instruction Following (94th percentile) and Mathematics (86th percentile), and robust performance in Coding (85th percentile). While its Hallucinations accuracy (96.0%) and Email Classification accuracy (98.0%) are solid, they are closer to the median compared to its other exceptional scores. Overall, GPT-5.5's key strengths lie in its superior reasoning, ethical understanding, and broad general knowledge, making it highly suitable for demanding professional applications despite its premium cost.