---
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 screen in Speak with the model picker open above the chat input. The dropdown has a Search models box and groups models by provider, showing a Gemini group with Gemini 2.5 Flash, Gemini 3 Flash and Gemini 3.5 Flash, each marked "Supports extended thinking", and an OpenAI group starting below it. The toolbar under the input shows the Marketer assistant and Gemini 2.5 Flash as the selected model.](/help/media/ai-chat/ai-chat-models.jpg)
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.

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