Run the intelligence where you trust it. Carry only the controls in your pocket.
A phone can be the control surface while a home machine handles private or repeated work and a cloud model handles the exceptions. Start with 80/20 as a hypothesis, then keep the split only if representative runs support it—and always show where each request actually runs.
Design the phone-to-model route
Prefer localPrivate, repeated, latency-sensitive
Document search, transcription, extraction, classification, code assistance and drafts where a smaller model passes the acceptance test—even when the request arrives from your phone.
Escalate to cloudHard, bursty or frontier-dependent
Complex reasoning, very large context, peak demand, advanced multimodal work or managed enterprise controls.
Route deliberatelyPolicy before model preference
Set allowed data, cost ceilings, latency targets and fallback behavior. Show phone, home or cloud as the execution location and log why an escalation occurred.
Verify either wayLocation is not reliability
A local hallucination is still a hallucination. Keep citations, deterministic tools, tests and approval gates around consequential output.
A coding-agent preprint separately reports 45–79% cloud-token savings from local routing plus prompt compression, depending on workload. These results point toward selective cloud escalation; they do not make 80/20 a population-wide measured fact.