Source record

Published by Hugging Face Blog (T1.5 source). The original is at https://huggingface.co/blog/ibm-research/model-routing-is-simple-until-it-isnt.

Pipeline notes

The summary and note below are generated by the signal pipeline — they are Beyond Desk’s reading, not quotations from the source.

IBM Research describes challenges in model routing for agentic systems. Testing 417 tasks on AppWorld Test Challenge with the same CodeAct agent, Claude Sonnet 4.6 cost $79 total while GPT-4.1 cost $155, despite lower token pricing. The difference stems from cache-hit economics: Sonnet's lower cache-read pricing made it cheaper for context-heavy agent workloads.

Counterintuitive cost data from a 417-task benchmark shows caching, not sticker price, drives real agent-system economics. Reframes routing as systems optimization, not classification.

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