Routing versus orchestration
A smart router may pick the cheapest or fastest suitable model for a request. Multi-model orchestration manages an objective across time: plan the work, dispatch specialists, collect outputs, resolve conflicts and produce a final artifact.
You can build orchestration on top of any capable gateway. The architectural question is whether mission state belongs in your application framework or in the control plane itself.
Why persistent state matters
Long-horizon jobs eventually encounter worker restarts, network failures and provider errors. If the mission exists only in process memory, recovery becomes difficult and duplicate work becomes likely.
Persistent task state lets the worker lease a mission, checkpoint completed work, retry failed specialists and resume from the last durable phase.
Review before synthesis
Parallel agents often produce plausible but conflicting answers. A dedicated review pass should look specifically for contradictions, unsupported claims, missing evidence and untested assumptions.
If the reviewer identifies a material gap, targeted follow-up work is usually more efficient than rerunning the entire mission. The final synthesis should then reconcile evidence rather than concatenate specialist outputs.
Independent final verification
A synthesis model is biased toward defending the answer it just created. A separate verification call can inspect the draft against the original objective and prior review notes, identify remaining errors and return a corrected final answer.
That extra call costs more, so it is not appropriate for every request. It is most valuable for longer, higher-stakes knowledge work where silent contradictions are expensive.