Z.ai GLM 5.2 is a large-scale reasoning model that excels at coding and tool use across long-running tasks. It maintains engineering context and follows standards consistently through a full development workflow. Accessed via OpenRouter with a context window of up to 1M tokens. Well suited for long-horizon agent workflows, project-level software engineering, and complex multi-step automation. Use the reasoning-effort dropdown to tune thinking depth; pick high or xhigh for hard problems. For everyday chat, Seed or the local models cost less; for deep Chinese-language work, consider Qwen 3.5.