z-ai/glm-5.1GLM-5.1 delivers a major leap in coding capability with significant gains in handling long-horizon tasks. Released April 7, 2026. 202,752 token context. Unlike previous models built around minute-level interactions, GLM-5.1 can work independently and continuously on a single task for more than 8 hours, autonomously planning, executing, and improving itself throughout the process, ultimately delivering complete, engineering-grade results. Pricing: $1.05/M input, $3.50/M output.