OpenAI 4.1 family

The GPT-4.1 family is now live on Retell AI! Here’s how the models compare:

Intelligence:

GPT 4.1 > GPT 4o mini > GPT 4o > GPT 4.1 mini > GPT 4.1 nano

Latency (lower is faster):

GPT 4.1 nano < GPT 4.1 mini < GPT 4o mini < GPT 4o < GPT 4.1

Price (per minute):

GPT-4.1 nano ($0.004) < GPT-4o mini ($0.006) < GPT-4.1 mini ($0.016) < GPT-4.1 ($0.045) < GPT-4o ($0.050)

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Version Control for Agents

You can now create and manage agent versions directly in the Agent Builder:

• Make changes and test your agent safely—without affecting your live production calls.

• Revert to any previous version with a single click.

Just hit the “Deployment” button to save a version, and use the history button to view and restore previous versions.

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Test Outbound Calls with Dynamic Variables

You can now enter dynamic variables when sending a test call directly from the platform—making it easier to simulate real scenarios during testing.

Note: The test call will automatically pull in the dynamic variables you’ve set in the agent configuration.

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Expanded Multilingual Support

Multilingual has updated!

Now support seamlessly switching between English, Spanish, French, German, Hindi, Russian, Portuguese, Japanese, Italian, Dutch.

(using nova 3)

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More Languages

We’ve also added support for 10 more languages:

Romanian, Danish, Finnish, Greek, Indonesian, Norwegian, Slovak, Swedish, Bulgarian, Hungarian.

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Opt in Secure URL

If you want to prevent unauthorized access in case the URL is leaked, you can opt in for secure URLs. Secure URLs automatically expire 24 hours after they are generated, providing an additional layer of security.