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

# MODEL PARAMETERS AND PROMPTS

> System prompts and model parameters to customize your model's behavior

## OVERVIEW

You may want to run a quick experiment to determine which system prompt or model parameters are best for your use-case. The Playground allows you to adjust
these independently for each panel, or to apply the same settings to all panels at once.

***

## SET A SYSTEM PROMPT

Click the gear icon in any panel header to open **System Prompts**. The dialog gives every open model its own column and its own text box, so each panel can carry a different instruction.

* Leave a box empty to send no system message at all.
* Click `Apply to all` on a column to copy that column's text into every other column.
* Click `Update` to commit. Closing the dialog any other way discards your edits.

System prompts apply to every request the panel makes from then on, including messages already in the conversation history.

***

## TUNE SAMPLING PARAMETERS

Click the sliders icon in a panel header to open **Model Parameters** for that panel alone.

| Parameter     | What it does                                                                | Accepted range                                     |
| ------------- | --------------------------------------------------------------------------- | -------------------------------------------------- |
| `Temperature` | Higher values make output more random                                       | 0 to 2, or 0 to 1 for Anthropic-backed deployments |
| `Top P`       | Sample from the smallest set of tokens whose probability sums to this value | Greater than 0, at most 1                          |
| `Max Tokens`  | Cap on the length of the response                                           | Whole number, 1 or more                            |
| `Seed`        | Fixes sampling so a repeated prompt returns the same answer                 | Whole number                                       |
| `Top K`       | Sample only from the K most likely tokens                                   | Whole number. Use `-1` to disable                  |

Only the parameters the panel's model actually accepts are shown, so the set differs by what sits behind the panel:

| Backing the panel                            | Temperature | Top P | Max Tokens | Seed | Top K |
| -------------------------------------------- | ----------- | ----- | ---------- | ---- | ----- |
| Oumi base models and your own trained models | Yes         | Yes   | Yes        | Yes  | Yes   |
| Deployments backed by OpenAI                 | Yes         | Yes   | Yes        | Yes  | No    |
| Deployments backed by Anthropic              | Yes         | Yes   | Yes        | No   | Yes   |

Leave a field blank to omit it from the request entirely, in which case the model's own default applies. Values outside the accepted range are rejected before the request is sent.

Click `Update` to apply the parameters to this panel, or `Apply to all` to copy them to every panel. When you apply to all, any parameter a panel cannot use is dropped and any value outside that panel's range is pulled to its nearest limit, so a comparison never fails because one model is stricter than another.