When the agent generates something for you, it uses a model picked for the job. Models lets you swap that model for another. Open it in Settings › Customize › Models. Nothing here needs setting up. If you change nothing, every job runs on its default.
Models in Simple mode with Images, Vector art, Video and Music, light themeModels in Simple mode with Images, Vector art, Video and Music, dark theme

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Simple and Advanced

Simple asks once for each kind of output:
RowWhat it covers
ImagesEverything the agent draws, at every quality. Product shots and photos of people use it too when the model can do them
Vector artLogos and icons as real SVG, at every quality
VideoClips from a prompt or a still image
MusicInstrumental and vocal music from a description
SpeechReading text aloud
Advanced lists every job on its own, so you can pick a different model for each:
JobWhen it is used
ImagesEverything the agent draws, unless one of the jobs below applies
Images, best qualityOnly when you ask for maximum quality in so many words
Vector artLogos and icons, as real SVG rather than a picture of one
Vector art, best qualityThe same, at the higher tier
Product and mockupsFlat light and front-on framing: packaging, mockups, catalogue shots
Product and mockups, best qualityThe same framing at 2K
Photos of a personPhoto series, restyling and face swaps, which work from a reference photo
Video, Music, SpeechAs in Simple
Models in Advanced mode with a row for each image job, light themeModels in Advanced mode with a row for each image job, dark theme

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Pick a model

Open the list on a row and choose a model. Each one shows its price in credits. A long list has a search field at the top.
The list of image models with their prices in credits, light themeThe list of image models with their prices in credits, dark theme
Under the row you see what the chosen model costs, such as “About 50 credits per 5 seconds” for video, and what it is good at. The change applies to everything the agent generates from then on. Once you have picked something other than the default, Reset to default appears under the row.
The Video row with a chosen model and Reset to default, light themeThe Video row with a chosen model and Reset to default, dark theme

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Back to Simple

If you picked models job by job in Advanced and they differ within a group, switching to Simple asks first. Use one model runs the whole group on the model now set for it, wherever that model can do the job. The other jobs go back to their defaults.
The Use one model per group window, light themeThe Use one model per group window, dark theme

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On the free plan

Choosing models is part of a paid plan. On the free plan you can see every model and its price, and your generations run on the defaults.
Models with the notice that choosing models is part of a paid plan, light themeModels with the notice that choosing models is part of a paid plan, dark theme