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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

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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.

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Resolution steps

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If using Anthropic direct

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Step 1: Add a custom model

Go to Settings > AI providers 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.

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If using AWS Bedrock

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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:
Instead, select the regional variant:
Other regional prefixes (e.g., eu., ap.) follow the same pattern.

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If using Vertex AI

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Step 1: Select the versioned model ID

Use either of the following IDs when configuring the model:

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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.