GLM 5.3 Review: Painfully Slow, Unusable Speed Compared to Competitors
Scobleizer · x · 2026-08-15
A user review of Zai's GLM 5.3 highlights speed as the critical flaw, disregarding model quality. Described as "painfully, absurdly slow" and "basically unusable," it is reported to be 2–3x slower than even notoriously slow models like Kimi or DeepSeek. The user notes that after 9 hours, the model remains unsuitable for serious work and suggests Zai should follow Moonshot's example of pausing new subscriptions to protect service quality for existing users.
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