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How Underlord uses AI creditsEach prompt uses credits for Underlord’s reasoning (the “agent brain”). When Underlord runs a tool or applies an effect on your behalf you’ll be charged for both the agent brain and the tool itself.Underlord is also non-deterministic: the same prompt can cost different amounts on different runs. All of these costs show up under “Underlord” in your Usage tab. For the full picture, see Track and understand your media minutes and AI credits.

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How do I open / where is Underlord?

Open any project, click the Underlord icon in the right-hand sidebar, and start chatting with Underlord.

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Choose your model

Choose which model powers Underlord by clicking the model selector (the cube icon) near the bottom of the Underlord chat window. Premium models are available on paid plans. Model picker interface in Descript showing available AI model options

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Available models

Auto (Descript’s choice)
Claude Fable 5
Claude Haiku 4.5
Claude Sonnet 5 / Sonnet 4.6 / 4.5 and 4.6 Thinking
Claude Opus 5 + Thinking / Opus 4.8 / 4.7 / 4.6
GPT 5.4 / 5.4 Thinking
GPT 5.5
Gemini 3.1 Pro
Gemini 3.5 Flash

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What can Underlord do?

Ask Underlord to help with nearly any editing goal. While we provide a few examples below, the possibilities are endless, and we encourage exploration. If you don’t see it here—try it anyway, and see what happens.
Looking for AI Tool buttons?Tools like Remove Filler Words, Shorten Word Gaps, and Edit for Clarity are now part of the AI tools panel. You can still use them manually — or ask Underlord to take care of them for you as part of a prompt. Learn more about manually applying AI tools.

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How to leave feedback

Underlord is still in beta, and we’re actively improving it. Try bold prompts, mix tasks together, and find out just how capable your new co-editor is. Try it out and let us know how it’s going. Click the thumbs up or thumbs down icon in the action bar below Underlord’s response, and drop us a note with your thoughts. AUFeedback-2.gif

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What to expect when working with Underlord

Descript’s AI features, including Underlord, are powered by large language models that can do remarkable things, but they’re still learning and sometimes get things wrong. These tools are designed to be helpful, fast, and flexible, but they don’t always know when they’re out of their depth. At times, Underlord might overpromise, make incorrect assumptions, or follow you into workflows it’s not equipped to complete. That can be frustrating, especially when you’re on a deadline or expecting hands-off results. We understand. We’re actively working to improve both the AI’s honesty and its humility. This means adding better safeguards so the agent doesn’t agree to do things it can’t actually deliver, and making it more transparent about its current limitations. In the meantime, Underlord works best when treated like a fast, talented collaborator who still needs clear instructions, context, and regular check-ins. For example, it can’t make edits in the background while you’re recording—it needs your narration or script in place first. And when you ask it to do something complex, it helps to check its work and give feedback as you go. Point Underlord at specific scenes, layers, or script passages to give it the context it needs. AI isn’t magic, but it is a powerful creative partner when used thoughtfully. As we continue improving Underlord, your experiences—good and bad—help shape its future. If you run into issues or have suggestions, we’d love to hear from you. Thanks for building with us.