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

# Loop models require Anthropic API key, not just Bedrock

export const plans_0 = "Any"

export const deployments_0 = "Any"

export const data_plane_version_0 = undefined

export const use_case_0 = "Use case - Organizations using only AWS Bedrock as their AI provider who encounter failures when trying to use Claude model names in Loop"

<Note>
  **Applies to:**

  * Plan - {plans_0}
  * Deployment - {deployments_0}
  * {data_plane_version_0}
  * {use_case_0}
</Note>

## Summary

**Issue:** Models listed in the Loop picker (e.g., `Claude 4.6 Sonnet`) fail to work even though AWS Bedrock models like `us.anthropic.claude-opus-4-5-20251101-v1:0` function correctly.

**Cause:** Loop's default model picker shows Anthropic direct-API model names, which route through Anthropic's API — not through a configured Bedrock provider.

**Resolution:** Add Anthropic as a separate AI provider with a valid API key, or use the full Bedrock model identifier in Loop.

## Resolution steps

### If you want to use the friendly model names shown in Loop (e.g., `Claude 4.6 Sonnet`)

#### Step 1: Add Anthropic as a provider

Go to **<Icon icon="settings-2" /> Settings** > [**<Icon icon="sparkle" /> AI providers**](https://www.braintrust.dev/app/~/configuration/org/secrets), select **Anthropic**, enter your Anthropic API key, and save.

#### Step 2: Confirm models are available in Loop

Go to **<Icon icon="settings-2" /> Settings** > [**<Icon icon="blend" /> Loop**](https://www.braintrust.dev/app/~/configuration/org/loop) and verify the Anthropic models are enabled.

### If you only have AWS Bedrock configured and want to stay with Bedrock

#### Step 1: Use the full Bedrock model identifier

When selecting a model in Loop, use the full Bedrock identifier instead of the friendly name.

**Example:**

```
us.anthropic.claude-opus-4-5-20251101-v1:0
```

## Notes

* The Loop model picker displays Anthropic direct-API model names by default, even when only Bedrock is configured. This is a known UX issue.
* Bedrock and Anthropic direct API are separate providers. Configuring one does not enable the other.
* Org-level provider configuration is required. Project-level model settings do not apply in Loop.