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

# ApiFormat

Only tools usable on this API format

## Example Usage

```typescript theme={null}
import { ApiFormat } from "@openrouter/sdk/models/operations";

let value: ApiFormat = "responses";

// Open enum: unrecognized values are captured as Unrecognized<string>
```

## Values

```typescript theme={null}
"responses" | "chat-completions" | "anthropic-messages" | Unrecognized<string>
```