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Once you’ve configured one or more model providers, you can choose which one Cyrus uses by default for every Linear issue and agent run.

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Change the Default Model Provider

1

Go to Behaviours settings

Navigate to app.atcyrus.com/settings/behaviours.
2

Select a provider

Find the Default Model Provider dropdown and select the provider you want Cyrus to use by default (e.g. Claude, OpenAI/Codex, Cursor).
This setting applies globally — every new issue and agent run will use the selected provider unless overridden per-issue.

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Override the Provider per Issue

You can override the default provider for a specific issue in two ways:

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Using an inline tag in the issue description

Add one of the following tags anywhere in your Linear issue description: 
[agent=claude]
[agent=codex]
[agent=cursor]
[agent=gemini]

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Using a Linear label

Apply the provider name as a label on the issue: 
claude
codex
cursor
gemini

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Override the Model per Issue

You can also override the specific model (not just the provider) for a given issue:

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Using an inline tag in the issue description

Add one of the following tags anywhere in your Linear issue description: 
[model=opus]
[model=sonnet]
[model=haiku]

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Using a Linear label

opus
sonnet
haiku
For more on model labels, see Labels and Routing.

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Agent Sessions

The agent (provider) cannot be switched within an active agent session. If you need to use a different provider on the same issue, a new agent session will be spawned with the selected agent.
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