Model routing can become an antipattern when cache breaks across tasks
kevinkern · x · 2026-07-24
The poster argues that model routing is often an antipattern unless you truly need different models for quality/task fit, latency, cost, or privacy/local-use constraints.
A key caveat is multi-turn workflow reuse: if a user keeps working in the same chat and the router switches models for a harder task, you can break cache locality and lose more than you save. In many cases, if one model can cover the full range and only reasoning effort needs to vary, routing may be unnecessary.
Related event: Switching Models Mid-Chat Breaks Context Cache(2 posts)→
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