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Set effort in the harness you already use. Nexus Auto reads it when it picks a model for the turn. Higher effort asks for a more thorough attempt. Lower effort asks for a lighter one.

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Claude Code

Open /model. Effort appears under the model list, for example High effort. Press the left and right arrow keys to change it. Enter saves it as the default. s applies it to this session only.

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Codex and the ChatGPT desktop app

Open the model picker. In the Codex CLI, that is /model, titled Select Model and Effort. Choose the effort there. The ChatGPT desktop app reads the same Codex config, so the effort applies to both.

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Other harnesses

Use the harness’s own effort control where it has one. Nexus CLI does not set effort for you. The old --routing-preference flag has no effect.