---
title: "Models"
description: "Pick which model powers a conversation from the AI Chat toolbar, and what each available model is best suited to."
---

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

# Models

## Selecting a model for a conversation


The chat input toolbar includes a model picker (the sparkle icon with the model name) that lets you choose which AI model powers the current conversation. The available models as of this writing are:

- **Claude Sonnet 4.6** (Anthropic), fast and balanced. The default for most workspaces.
- **Claude Opus 4.8** (Anthropic), Anthropic's highest-capability model; includes extended thinking. Indicated by a sparkle icon in the picker.
- **GPT-5.5** (OpenAI)
- **GPT-5.4 mini** (OpenAI)
- **Gemini 2.5 Flash** (Google)

Models that support extended thinking are marked with a sparkle icon next to their name in the dropdown. The model is fixed for the life of a conversation; to switch models start a new chat.

## Choosing an assistant

Next to the model picker is an assistant picker (the person icon). Assistants give the model a persona and set of instructions that shape how it responds. The built-in assistants are:

- **General**, default, all-purpose responses
- **Researcher**, structured analysis and synthesis
- **Marketer**, copy and content-oriented responses
- **Sales**, deal and prospect-focused responses
- **Recruiter**, hiring and candidate-oriented responses

You can also create custom assistants with your own instructions. Click **Create new assistant** at the top of the assistant picker dropdown, or manage your assistants at **Profile** under the **AI Assistant** section. Custom assistants appear under **Your Assistants** in the picker.

## Setting a workspace default model

To avoid picking a model every time, set a default at **Profile > AI Assistant**. Under the **Default AI model** section, choose the model you want from the dropdown and the setting saves immediately. Individual chats can still override the default using the model picker in the input toolbar.

## Related articles

- [How to create custom AI Chat prompts](https://intercom.help/speak-ai/en/articles/6875284)
- [AI Chat FAQ](https://intercom.help/speak-ai/en/articles/6836930)

The fastest way to reach us is the live chat in the app (the chat bubble in the bottom corner). You can also email [success@speakai.co](mailto:success@speakai.co).

Want a hand setting this up? [Book a free consult](https://calendly.com/speak-ai/consult?utm_source=docs&utm_campaign=consult) and we'll do it together on your account.

---
Related: [AI Chat](/help/ai-chat/) · [Attachments](/help/ai-chat/attachments/)

Source: https://docs.speakai.co/help/ai-chat/models/index.mdx