OpenAI: GPT-5.6 Sol

OpenAI's GPT-5.6 Sol, released on July 9, 2026, is a flagship model designed for complex reasoning, coding, and agentic workflows, with a particular aptitude for command-line and multi-step coding tasks. It performs among the fastest models, typically ranking in the top tier for speed (78th percentile across 8 benchmarks). However, its pricing tends to be at premium levels (18th percentile). A standout feature is its exceptional reliability, demonstrating a 100% success rate across all evaluated benchmarks, indicating minimal technical failures. The model exhibits strong performance across various categories. It achieves perfect accuracy in both General Knowledge and Ethics, with the former also being the most accurate at its price point and speed. Its Instruction Following (91.0% accuracy, 95th percentile), Coding (95.0% accuracy, 89th percentile), Reasoning (98.0% accuracy, 88th percentile), and Mathematics (96.0% accuracy, 92nd percentile) capabilities are particularly robust, aligning with its intended use cases. While its Hallucinations (98.0% accuracy) and Email Classification (98.0% accuracy) scores are good, they are not as exceptionally high as its top-tier performances in other areas. Overall, GPT-5.6 Sol is a highly reliable and performant model, especially for demanding analytical and coding tasks, albeit at a premium cost.