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

# Claude Sonnet 4 missing from playground model picker

> [!NOTE]
>
> **Applies to:**
>
> * Plan - Any
> * Deployment - Any
> *
> * Use case - Migrating from Claude Sonnet 4 to a newer version and needing to run playground comparisons when Sonnet 4 no longer appears in the model picker

## Summary

**Issue:** `claude-sonnet-4-20250514` no longer appears as a selectable model in the Braintrust Playground model picker, even though it works in existing prompts that already had it selected.

**Cause:** The built-in catalog entry for Claude Sonnet 4 is marked deprecated, which hides it from new selections without removing it from configurations that already reference it.

**Resolution:** Restore access by adding a custom model entry for your provider, or use the correct provider-specific model ID.

## Resolution steps

### If using Anthropic direct

#### Step 1: Add a custom model

Go to **Settings > Models** and open your Anthropic provider. On **Setup**, expand **More settings**. Under **Models**, click  **Custom model** and enter `claude-sonnet-4-20250514`. Click the  settings icon beside the model to configure **Flavor** and **Format**:

* **Model name:** `claude-sonnet-4-20250514`
* **Flavor:** `Chat`
* **Format:** `Anthropic`

Click **Update**. `claude-sonnet-4-20250514` will now appear in the Playground model picker.

### If using AWS Bedrock

#### Step 1: Use the regional inference profile ID

Do not use the base ID `anthropic.claude-sonnet-4-20250514-v1:0`. It will fail with:

```
Invocation of model ID anthropic.claude-sonnet-4-20250514-v1:0 with
on-demand throughput isn't supported. Retry your request with the ID
or ARN of an inference profile that contains this model.
```

Instead, select the regional variant:

```
us.anthropic.claude-sonnet-4-20250514-v1:0
```

Other regional prefixes (e.g., `eu.`, `ap.`) follow the same pattern.

### If using Vertex AI

#### Step 1: Select the versioned model ID

Use either of the following IDs when configuring the model:

```
publishers/anthropic/models/claude-sonnet-4@20250514
publishers/anthropic/models/claude-sonnet-4
```

## Additional notes

Deprecated catalog entries remain functional in existing prompts and playgrounds. The model only disappears from the picker for **new** selections. Once restored via custom model or the correct provider ID, Sonnet 4 and Sonnet 4.6 can be used side by side in the Playground for migration comparison.


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