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Document Understanding user guide

Metering and charging logic (Flex Plan)

When using UiPath® Document UnderstandingTM modern projects, it's essential to understand the consumption of AI units.

Tip:

How charging works for modern projects

For Document Understanding modern projects, AI units are charged per operation. You pay only for the operations you run on each page:

OperationAI units per page
Digitization (including OCR)0
Classification0.2
Extraction (with prior classification)0.8
Extraction (without prior classification)1

Per-page cap: A page that is both classified and extracted never exceeds 1 AI unit in total. Digitization is always free.

The per-operation rate is the same regardless of which classifier or extractor you use, including:

  • Classifiers: Generative, Predefined, ML, and Helix Classifier 1.0.
  • Extractors: Generative, Predefined, Legacy, Helix Extractor 1.0, and Helix Extractor 2.0.

This applies to both robotic process automation (RPA) and REST API operations. For full REST API pricing — including how classic-project API calls are charged — see Metering and Charging in the API guide.

Note:

If multiple extractors are applied to the same page, each extraction is counted separately and charged at 0.8 AI units, or 1 AI unit without prior classification. Applying the same model multiple times to the same page does not multiply the charge.

Through Document Understanding activity packages

For both DocumentUnderstanding.Activities and IntelligentOCR.Activities, the per-operation rates apply, based on the operation performed.

The per-operation rates apply only when:

  • For DocumentUnderstanding.Activities: a pre-defined generative or modern project classifier or extractor is in use.
  • For IntelligentOCR.Activities: a modern project classifier or extractor is in use.

If you use any other classifier or extractor, the respective consumption logic from classic projects is added to the per-operation charge. For more information, see Mixed projects.

Generative features — Activities 24.12-preview and above

This consumption applies in the following situations:

  • Using activities version 24.12-preview and above with PredefinedGenerative projects.
  • Using Document Understanding API v1.1 with PredefinedGenerative projects.

There are no additional AI units consumed when using Generative Classification and Generative Extraction. They follow the same per-operation rates as any other classifier or extractor, which means 0.2 AI units for classification and 0.8 AI units for extraction with prior classification, capped at 1 AI unit per page.

Note:
  • Generative features are included in the per-operation rate when using IntelligentOCR.Activities versions newer than 6.23.2-preview, or DocumentUnderstanding.Activities versions newer than 2.13.2-preview. On earlier versions, generative features use the separate consumption logic described in the following section.
  • Using Generative Validation consumes an additional 1 AI unit per processed page, bringing the total to 2 AI units per page when it runs.

Generative features — Activities up to 24.12-preview

This consumption applies in the following situations:

  • Using activities version up to 24.12-preview with the Predefined project.
  • Using Document Understanding API v1.0 with the Predefined project.

In these versions, generative features incur specific charges per operation, as described in the following table.

Table 1. Generative features AI units consumption for activities versions up to 24.12-preview

Generative featureConsumed AI units
Generative Classifier0.2 per operation
Generative Extraction1.2 per operation
Generative Validation1 per operation

Model training

There are no AI units charged when training and serving models. You can train models freely to improve performance, develop new capabilities, and experiment without incurring additional AI units charges.

Mixed projects (modern + classic)

When a project uses both classic and modern experiences, both pricing models apply based on their respective consumption.

The pricing model for classic projects applies in the following circumstances:

  • Extraction and classification done using classic projects, regardless of the activity package used (IntelligentOCR or DocumentUnderstanding.Activities).
  • Extraction and classification done using the out-of-the-box models included with the pre-defined project, regardless of the activity package used.
  • REST API calls against classic-project models — classic per-capability rates apply, not the 1 AI unit per-page rule.

For full classic-project metering — including activity-based rates per OCR engine, classifier, and extractor — see the Document Understanding User Guide for Classic Experience. For classic-project REST API rates specifically, see Metering and Charging in the API guide.

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