New Tracer Open-Source App Combines Opus 5 and Codex Workflows
TL;DR
The open-source desktop app Tracer puts Opus 5 and Codex to work in clearly separated roles. Opus 5 handles strategic planning while Codex generates and refines the code. Universe of AI walks through how that split turns complex problems into a structured workflow. It is a concrete look at what multi-model development setups look like in everyday practice.
Nauti's Take
Splitting roles between models is a promising approach. Separating planning from implementation removes exactly the failures that appear when one model does everything at once.
The limit is overhead: two models mean double the cost, more latency, and one more failure point at the handoff. Nauti suggests trying it on complex refactors, since small edits rarely repay the extra machinery.
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