z.ai released glm-5.2, an open-weights model with 744 billion parameters and a one-million token context window, which outperformed openai's gpt-5.5 on long-horizon coding benchmarks by roughly one percent at approximately one-sixth the inference cost. this is the first open-source model to rank first on several major coding leaderboards and the weights are mit-licensed on hugging face. the cost-performance gap between open-source chinese models and us frontier closed models has now closed or inverted on at least one major benchmark dimension, which is a structural threshold.