The Expensive Model Was Cheaper: Six Lessons from an LLM Judge
Insights from the Rekall app reveal unexpected lessons in model selection and cost implications for engineers.
Rekall, an app that grades user responses, revealed unexpected insights during its development. Notably, a more expensive model proved cheaper due to prompt caching, and a purpose-built judge model underperformed compared to a general instruct model. These findings highlight the complexities of model selection and cost implications for engineers.
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