GLM-5.2 vs Claude Sonnet 5: how they compare on coding

GLM-5.2 and Claude Sonnet 5 are two prominent coding models evaluated on their performance and cost-effectiveness, with GLM-5.2 known for its affordability and detailed output, while Claude Sonnet 5 is recognized for its speed and reliability, especially in mobile responsiveness. Released in June 2026, both models utilize a 1,000,000-token context window, but they differ significantly in pricing, with GLM-5.2 offering lower rates compared to Claude Sonnet 5's premium pricing. Evaluations using DesignArena's Fullstack App Quality rubric indicate Claude Sonnet 5 outperforms GLM-5.2 in areas such as UI quality and error handling, although GLM-5.2 is cited for producing more specific and detailed content at a lower cost. Despite this, Claude Sonnet 5 was quicker and maintained a higher level of responsiveness in a practical test scenario. Merge's Gateway service allows users to optimize their AI model selection based on various factors like budget, speed, and specific project requirements, offering flexibility and control over the routing of AI model requests.

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