Models, quality, credits, and daily limits

Every render has a model, quality, and image count. CAD Scene shows the total credit cost before you send.

Choose a model

A project has a default model. New Composer sends start with that model. Changing the model for one send does not change the project default.

Four models are currently available.

Nano Banana 2

• Supports Create, Enhance, and Edit.
• Supports composer references in all three modes.
• Offers Low, Medium, and High quality.
• Uses the discounted Flash credit rates.

Nano Banana Pro

• Supports Create, Enhance, and Edit.
• Supports composer references in all three modes.
• Offers Low, Medium, and High quality.
• Uses the standard credit rates.

Nano Banana

• Supports Create, Enhance, and Edit.
• Supports composer references in all three modes.
• Offers Low quality only.
• Uses the discounted Flash credit rate.

GPT Image 2

• Supports Create, Enhance, and Edit.
• Supports composer references in Create and Enhance.
• Does not accept composer references in Edit.
• Offers Low, Medium, and High quality.
• High quality uses a premium credit rate.

Model capability is a compatibility choice. CAD Scene does not promise that one model is always faster or visually better.

Quality and cost

Quality is chosen per send. A model change can move the current selection to the nearest supported quality. CAD Scene does not move to a higher unsupported price tier silently.

For Nano Banana 2 and Nano Banana Pro, quality maps to output resolution:

• Low: 1K
• Medium: 2K
• High: 4K

Nano Banana supports 1K output only. GPT Image 2 receives its own Low, Medium, or High provider quality setting.

Current render costs are per image:

• Nano Banana 2: Low 2 credits, Medium 4, High 10.
• Nano Banana Pro: Low 2 credits, Medium 5, High 13.
• Nano Banana: Low 2 credits.
• GPT Image 2: Low 2 credits, Medium 5, High 20.

Image count multiplies the per-image cost. Four Nano Banana Pro Medium images cost 20 credits. The Composer cost preview performs this calculation before submit.

The free 4K upscale is a separate Lanczos resize. It does not turn a Low or Medium generation into a new provider generation.

Credits and limits

Render credits are charged when the send is submitted. One send with multiple images creates one charge equal to the per-image rate multiplied by the count.

Other generation actions have fixed costs:

• Generate Composition: 5 credits.
• Generate one field: 3 credits.
• Lanczos 4K upscale: 0 credits.

Variations, retries, regenerations, and the Shrink or Enlarge actions submit new renders. They charge the selected or action-defined model and quality rate.

Credits and rolling daily limits are separate checks. Having enough credits does not bypass a limit.

Current rolling 24-hour limits are:

• 200 render submissions.
• 50 Composition generation requests.
• 30 field generation requests.

The render limit counts submissions, not output tiles. A single send with several parallel images uses one render-submission quota entry. It still charges for every image.

When a limit is reached, CAD Scene reports the estimated reset time. Wait for the rolling window or contact support for a higher cap.

Refunds

Failed and successfully cancelled render jobs refund their charged credits. Each output image has its own job and refund record. A failed tile does not cancel or refund its successful siblings.

Composition and field generation debit before the provider call. A provider or response failure refunds that operation.

Retry, Retry with model, Regenerate with model, Variations, Shrink, and Enlarge are new submissions. They create a new charge. A refund for the failed original does not make the replacement free.

An insufficient-credit rejection does not create renders or jobs. The transaction is rolled back.