Z.ai: GLM 5

Z.ai's GLM-5, released on February 11, 2026, is positioned as a flagship open-source foundation model for complex systems design and long-horizon agent workflows, targeting expert developers. With a substantial context length of 202800, it aims for production-grade performance. The model exhibits exceptional reliability, boasting a 97% success rate across benchmarks, indicating consistent operational stability. However, GLM-5 tends to have longer response times, ranking in the 7th percentile for speed, and is positioned at premium pricing levels, ranking in the 11th percentile for cost. In terms of performance across categories, GLM-5 demonstrates significant strengths in Coding (95.8% accuracy, 95th percentile) and Instruction Following (77.0% accuracy, 86th percentile), aligning with its design for complex programming tasks. Its Reasoning capabilities are also strong at 93.6% accuracy (81st percentile). General Knowledge is robust at 98.9% accuracy, though its percentile ranking is moderate (62nd). A notable weakness is observed in its handling of Hallucinations, with an 80.0% accuracy (25th percentile), suggesting room for improvement in acknowledging uncertainty. Email Classification and Ethics benchmarks show solid, albeit not top-tier, performance at 98.0% and 99.0% accuracy respectively. The model's high cost and duration across several benchmarks, particularly Hallucinations, General Knowledge, and Coding, underscore its slower processing and premium pricing.