> ## Documentation Index
> Fetch the complete documentation index at: https://fireworks.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Effort

> Set effort in your coding harness. Nexus Auto uses that when it picks a model.

Higher effort asks for a more thorough attempt. Lower effort asks for a lighter one.

## Claude Code

In [Claude Code](https://fireworks.ai/docs/nexus/harnesses/claude-code.md), open `/model`. Effort appears under the model list, for example **High effort**. Use the left and right arrow keys to change it, then press Enter to save it as the default, or press `s` to apply it to this session only.

## Codex and the ChatGPT desktop app

Open the model picker and choose the effort. In the [Codex](https://fireworks.ai/docs/nexus/harnesses/codex.md) CLI, that is `/model`, titled **Select Model and Effort**. The ChatGPT desktop app reads the same Codex config, so the effort applies to both.

## Other harnesses

Use the harness's own effort control where it has one. Nexus CLI does not set effort.

* The old `--routing-preference` flag has no effect.


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