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

# AI Models

> Anthropic, OpenAI, and Google Gemini are available in every Felix account by default.

No connection or setup required — reference them directly in any step using `@Anthropic`, `@OpenAI`, or `@Gemini`. Use them to analyse documents, extract structured data, classify records, generate content, and reason across complex inputs.

## Available AI connectors

| Connector     | Model  | Best for                                                          |
| ------------- | ------ | ----------------------------------------------------------------- |
| `@Anthropic`  | Claude | Long documents, legal and financial reasoning, complex extraction |
| `@OpenAI`     | GPT    | Classification, generation, structured extraction                 |
| `@Gemini`     | Gemini | Long-context tasks, multimodal inputs                             |
| `@Perplexity` | —      | Web-grounded research, finding current information                |
| `@Exa`        | —      | Neural search across web content                                  |

`@Anthropic`, `@OpenAI`, and `@Gemini` require no setup. `@Perplexity` and `@Exa` require an API key — add them from **Settings → Connectors**.

## Using AI models in steps

Describe what you want the AI to do in plain language. Felix constructs the prompt and API call automatically.

```
Use @Anthropic to review each contract from the previous step and
identify clauses that deviate from our standard terms.
Return a list of deviations with a short explanation for each.
```

```
Use @OpenAI to classify each application from the previous step as
low risk, medium risk, or high risk based on the stated income,
loan amount, and credit history. Return a confidence score for
each classification.
```

## Working with documents

AI connectors work directly with PDFs and documents. You don't need to extract text manually before passing a document to an AI step.

```
Pass each uploaded PDF to @Anthropic. Extract the applicant name,
requested amount, stated income, and any disclosed liabilities.
Output as a structured table.
```

## Web research

Use `@Perplexity` or `@Exa` when a step needs to find current information from the web.

```
Use @Perplexity to find the current regulatory requirements for
CASP licence applications in the Czech Republic. Return a
structured summary with source links.
```

## Controlling where AI is applied

Felix applies AI only at the steps that need it. Steps that fetch data, write to a spreadsheet, or send a notification run as structured code — no AI involved. This keeps costs predictable and execution reliable.

## Tips

* **Be specific about what to extract or produce.** Precise descriptions produce consistent outputs.
* **Use `@Anthropic` for long or complex documents.** Claude handles long-context tasks well — contracts, regulatory filings, and multi-page reports.
* **Use `@Perplexity` or `@Exa` for research steps.** When a step needs current information rather than processing a document.
* **Add a Human Checkpoint after AI steps** that produce content going downstream — especially before anything is sent or published.