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

# Agent Models

> LLM models available for Bizzy agents

Each agent runs on an LLM you choose. Bizzy offers a curated set of models from
multiple providers, so you can match each agent's model to the reasoning depth,
speed, and cost its job calls for.

## Available models

| Model                         | Typical use                                                    |
| ----------------------------- | -------------------------------------------------------------- |
| **Claude Sonnet** *(default)* | Balanced reasoning + cost for most agent tasks                 |
| **Claude Haiku**              | Fast, cheap — great for simple classification or short replies |
| **Claude Opus**               | Hardest reasoning, highest cost                                |
| **GPT-4o**                    | Strong general model with broad tool use                       |
| **GPT-4o Mini**               | Smaller GPT-4o for cost-sensitive work                         |
| **Gemini Flash**              | Low-latency model                                              |
| **Gemini Pro**                | Higher-capability Gemini model                                 |

<Note>
  No tier gating today — every organization can select any of these models.
  Usage is billed by the token, converted into Bizzy credits. See [Admin Guide
  → Billing](/admin-guide/billing/index) for how credits work.
</Note>

## Picking a model

Rough guidance:

* **Default to Claude Sonnet.** It hits the best balance of quality and cost for
  most agent workloads.
* **Move to Haiku or Flash** if latency and per-call cost matter more than
  reasoning depth (for example, a classifier agent that only picks a label).
* **Move to Opus** only when a task consistently fails at Sonnet — the cost
  delta is substantial.

## Changing the model

Open the agent's detail page and edit the **Model** field. The change applies to
all new conversations; conversations already in progress continue on whichever
model they started.

## Next steps

<CardGroup cols={2}>
  <Card title="Tool permissions" icon="shield-check" href="/user-guide/agents/tool-permissions">
    Control what the agent can do
  </Card>

  <Card title="Chat with an agent" icon="comments" href="/user-guide/agents/chat">
    The chat UI
  </Card>
</CardGroup>