Engineers mix models to balance speed and reasoning, or to catch hallucinations...

https://lukasnpyy234.cavandoragh.org/the-multi-model-fallacy-why-you-aren-t-orchestrating-you-re-just-switching

Engineers mix models to balance speed and reasoning, or to catch hallucinations via disagreement. But be careful. Auto-synthesis can hide model dissent and leak data across providers. Focus on reliability over hype—don't over-engineer the stack.