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  • Instructions: write clear, detailed prompts for the agent. Check Prompting 101: How to Talk to Your Agents for more advice.
  • Advanced > Model selection: choose the model the agent runs on, and its reasoning effort.

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Which model should I choose?

Start with an auto model, and use Standard unless you have a reason not to. The auto models page explains which one to use for different kinds of work. Pick a specific model only when you need a guarantee that the agent always runs on one exact model, for example to reproduce a known output.

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What reasoning effort should I set?

Reasoning effort only applies when you pick a specific model, and only the levels that model supports are selectable. See Reasoning effort for the levels and their tradeoffs.

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Can I change the model without editing the agent?

Yes. Use the model picker in the composer. It applies to your next message in that conversation only and leaves the agent untouched.