Using OSS models to save on inference costs without cutting quality

Open-source models have significantly advanced in performing tasks crucial for coding agents, such as reading long contexts and retrieving precise information from extensive codebases, at a fraction of the cost compared to frontier models. GLM-5.2, one of the leading open-source models, is available on Braintrust, where users can compare its performance with existing models using their own prompts and traces until July 31. In a comparative evaluation with Claude Opus 4.8, GLM-5.2 showed slightly less accuracy but was substantially more cost-effective, performing at about one-sixth of the cost per correct answer. Braintrust offers a streamlined experience for running GLM-5.2, eliminating the need for a separate inference setup, thereby allowing users to evaluate the model's quality and production behavior efficiently. This model is particularly beneficial for high-volume agent workflows, where cost savings may outweigh minor differences in accuracy.

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