As advanced models, GLM-5.1, GLM-5 and GLM-5-Turbo are comparable to Claude Opus model. Usage for these models will be calculated and deducted at “3 times the standard rate during peak hours and 2 times the standard rate during off-peak hours”; [...] As a limited-time benefit, GLM-5.1 and GLM-5-Turbo will only consume 1× quota during off-peak hours, valid through the end of April.
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From the docs
https://docs.z.ai/devpack/faq#glm-coding-plan-details