Noam Brown says that on some benchmarks, four-agent systems finish twice as quickly as the comparison setup while costing twice as much.

“but for some of the benchmarks,”

“basically if you have four agents working on the problem,”

“it is done twice as fast.”

“So you're basically paying,”

“because there's four agents working for half as long,”

“you're paying a 2x more to get an answer twice as quickly.”