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The model menu in the generation input picks which AI model the agent runs on. It also holds the thinking effort setting, which trades speed for depth. Seven of the nine models work on every plan. The two Fable models need a paid plan. Every model uses credits.
The model menu open in the generation input

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Pick a model

  1. Click the model name in the generation input.
  2. Pick a model from the list. Your next prompt uses it.
  3. Polymet asks whether to make it your default, for example Use Claude Sonnet 5.5 as your default model? Click Set as default to start every new thread with it, or Not now to use it in this thread only.
You can also type /model in the generation input, then part of a model’s name, and pick from the list. The model can’t be changed while the agent is waiting for you to approve an action. The menu says Model is locked during tool confirmation until you answer.

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The models

On the Free plan, the Fable models are greyed out and marked Paid plans. Every paid plan includes them, Keep Alive too. See Plans. If your default model is one your plan no longer includes, the model button shows a lock. Pick another model before you send. Credits are charged by AI model usage, so a model with higher rates, a higher thinking effort or a longer generation spends more. See How credits work.

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Thinking effort

Open the model menu and drag the Thinking effort slider between Faster and Smarter: The setting is yours, not your project’s. It applies to all your generations, on every model and in every project. The globe button in the generation input lets the agent search and read the web while it works, for example to look up a library’s docs or read a page you name. It is on to start with.
  • On: Web search is on — the model can search and read the web
  • Off: Web search is off — the model can’t search the web
Like thinking effort, this setting is yours and applies in every project.