Z.ai: GLM 5.1

Z.ai's GLM-5.1, released on April 7, 2026, demonstrates moderate speed performance, ranking in the 20th percentile across benchmarks. It is positioned at a premium price point, falling into the 10th percentile for cost. A standout feature is its exceptional reliability, achieving a 100% success rate across all 8 benchmarks, indicating consistent and dependable operation. The model excels in several key areas. It achieves perfect accuracy in Hallucinations, General Knowledge, and Reasoning, often being the most accurate model at its price point and speed. Its coding capabilities are particularly strong, scoring 96.0% accuracy and ranking in the 96th percentile, aligning with its description of a major leap in coding. Instruction Following and Mathematics also show strong performance, with 83.0% and 95.0% accuracy respectively, placing them in high percentiles. While its Ethics and Email Classification scores are respectable at 98.0% and 97.0%, they rank lower in comparison to other models in those specific categories. The model's primary strength lies in its high accuracy across complex cognitive tasks and its robust reliability, making it a powerful tool despite its moderate speed and premium pricing.