GLM-5.2 is probably the most powerful text-only open weights LLM

Z.ai has released GLM-5.2, a 753 billion parameter text-only model with a 1 million token context window, significantly larger than its predecessor GLM-5.1, which had a 200,000 token limit. This model utilizes a Mixture of Experts architecture with 40 active parameters and has been benchmarked as the leading open weights model on the Artificial Analysis Intelligence Index, although it is noted to be token-hungry, requiring 43k output tokens per task. Its performance in frontend web development tasks is notable, ranking second on the Code Arena WebDev leaderboard, highlighting its potential for practical applications despite the absence of image input capabilities.