> For the complete documentation index, see [llms.txt](https://docs.nexos.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.nexos.ai/workspace/chat.md).

# nexos.ai Chat

Learn how nexos.ai Chat works. Pick a model or let Auto choose, adjust settings like temperature and system prompts, and compare models side by side.

nexos.ai Chat lets you start a conversation with any model from a single interface. Pick a model manually or let Auto select the best fit for your prompt, then refine responses with advanced settings like temperature and system prompts. You can also compare multiple models side by side to see which one performs best for your task.

## Getting Started

Starting an [AI chat](https://nexos.ai/features/ai-chat/) takes three steps: open a new chat window, choose the model that fits your task, and enter your prompt.

{% stepper %}
{% step %}

### Click **New chat**

Click **New chat** on the left side of the screen.
{% endstep %}

{% step %}

### Choose your preferred model

Choose a model from the selection window (see image below), or select **Auto** to let nexos.ai choose the best model for your request based on context and your workspace rules. 

Each model shows context window size, supported inputs, and supported outputs.

Match your task to the model's capabilities. For images, choose models like DALL-E with image output. For text, any text-output model works.

<figure><img src="https://4112003433-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FDcOhapgXnoeDvgGQ8Jm4%2Fuploads%2Fs4CGoqz7ydYyXUfzlUyO%2Fezgif.com-video-to-gif-converter.gif?alt=media&amp;token=4abdf48b-a59d-4d8e-9279-b9fdb636a90a" alt="nexos.ai chat interface showing a prompt with an attached CSV file requesting help building a quarterly report."><figcaption></figcaption></figure>

{% hint style="info" %}
Tech details info:

* Context window: measured in tokens, determines how much text can be processed
* Input types: text, image, audio, file compatibility
* Output types: text, image, code generation capabilities
  {% endhint %}
  {% endstep %}

{% step %}

### Begin your conversation

Enter your prompt in the chat interface. Use web search (click **Web search**) to enhance results with current information. Upload files (click the **+** icon) or images to include additional context in your conversation. See example below:

<figure><img src="https://4112003433-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FDcOhapgXnoeDvgGQ8Jm4%2Fuploads%2FpuTQo4blcfyUwqx6kHsP%2FScreenRecording2026-03-27at18.14.07-ezgif.com-video-to-gif-converter.gif?alt=media&amp;token=2d708252-555c-49a4-9ec2-301eaa2a8d11" alt="nexos.ai model selection window showing Claude Opus 4.1 details including context window, input/output types, and reasoning capability."><figcaption></figcaption></figure>
{% endstep %}
{% endstepper %}

## Advanced options

This is completely optional, if you'd like - you can configure these settings to customize how the AI responds and behaves in your chat.

{% stepper %}
{% step %}

### Max completion tokens

Limits the length of the AI's response.

<figure><img src="https://4112003433-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FDcOhapgXnoeDvgGQ8Jm4%2Fuploads%2FDUDp0B9wveKFqt1K9lBB%2FScreenRecording2026-03-27at18.18.00-ezgif.com-video-to-gif-converter.gif?alt=media&amp;token=cca2f5fc-ffe7-4f8f-8a8d-b13401c3ad1b" alt="nexos.ai max completion tokens limit." width="513"><figcaption></figcaption></figure>
{% endstep %}

{% step %}

### Temperature

Controls response randomness. Lower values (0.1) produce more focused answers, higher values (0.9) create more **creative** responses.
{% endstep %}

{% step %}

### Top P

Narrows word choices during generation. Lower values make responses more predictable.
{% endstep %}

{% step %}

### System prompt

Sets the AI's behavior and role before the conversation starts. Acts as instructions for how the assistant should respond.
{% endstep %}
{% endstepper %}

## Compare models

Compare model capabilities & choose models that fit your needs best.

{% stepper %}
{% step %}

### Select models

Choose multiple models you want to test from the model search, and enter your prompt.
{% endstep %}

{% step %}

### Send prompt and compare

Review responses from all selected models side by side

<figure><img src="https://4112003433-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FDcOhapgXnoeDvgGQ8Jm4%2Fuploads%2F8xsP8SxOeTGtpCJiV5vh%2Fimage.png?alt=media&amp;token=c3468d39-e1b9-4d8b-8a38-f12a15a4d635" alt="nexos.ai new chat screen with model selector and suggested prompt shortcuts."><figcaption></figcaption></figure>
{% endstep %}
{% endstepper %}


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.nexos.ai/workspace/chat.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.