What is GLM 5.2?

GLM 5.2 is an open-weight language model developed by a Chinese company. According to Nathaniel Whittemore, it achieved top rankings on Bridgebench and reasoning benchmarks, outperforming Fable 5 at a fraction of the cost and with high inference speed.

• Jun 2026 - Nathaniel Whittemore reported that GLM 5.2 is number one on Bridgebench and number one on reasoning, beating Fable 5 at 1/10 of the cost and 300 tokens per second.
• Jun 2026 - Ryan Sean Adams described GLM 5.2 as a Chinese model with performance on par with or surpassing Opus 4.8.
• Jul 2026 - Nathaniel Whittemore stated that GLM 5.2 was the first open-weight model to make the fallback strategy feel like genuine competition for the frontier.