AI Model Support in Appian

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This page tracks the lifecycle status and support for generative AI (artificial intelligence) models used by Appian. It provides information about supported models, regional availability, deprecation timelines, and guidance for administrators managing AI model configurations.

As AI models are added, updated, or deprecated, refer to this page to:

Understand which AI models are supported.
Plan for model deprecations and transitions.
Identify regional restrictions that may affect feature availability.
Take required administrative actions to maintain AI functionality.

Use the interactive tool below to explore which models power each feature, view their processing regions, and understand which regions your data may be processed in. Refer to AWS Bedrock documentation for the most up-to-date model information, including regional availability and deprecation dates.

AI Feature Model & Region Explorer

Select a feature to see which models power it, their processing regions, and regional data routing.

Feature

Region

Supported AI models in Appian

The following Appian-provided AI models are supported in Appian:

Model	Availability	Notes
Amazon Nova 2 Lite	Requires processing region	Fast model for text and vision tasks; not available for GovCloud
Amazon Textract	Multiple regions	Document analysis and text extraction
Claude Haiku 3.5	Limited regions	Fast, efficient language model
Claude Haiku 3	Multiple regions	Quick and accurate targeted performance
Claude Haiku 4.5	Requires processing region	Fast model with near-frontier intelligence
Claude Haiku 5.5	Requires processing region	Fastest model built for high-volume, latency-sensitive work
Claude Sonnet 3.5 v2	Limited regions	Updated version with improved capabilities
Claude Sonnet 3.7	Requires processing region	High-performance model with improved reasoning
Claude Sonnet 3	Limited regions	Balance of intelligence and speed
Claude Sonnet 4.5	Requires processing region	Smartest model for complex AI agents and coding
Claude Sonnet 4.6	Requires processing region	Reasoning model with larger context window
Claude Sonnet 4	Requires processing region	High intelligence and balanced performance
GPT 5.4	Limited regions	Latest flagship model with cutting-edge reasoning capabilities; extended thinking always enabled
GPT 5.5	Limited regions	Most capable model with advanced reasoning and multimodal understanding; extended thinking always enabled
Titan Text Embeddings V2	Multiple regions	Text embedding for semantic search

Tip: Feature availability depends on both model support and regional availability.

PDF processing limits by model

The PDF limits for "Visual elements & text" document processing mode vary by AI model:

Model	Max pages	Max file size
Claude Sonnet 5	100	24 MB
Claude Sonnet 4.6	100	24 MB
Claude Sonnet 4	100	24 MB
Claude Sonnet 4.5	100	24 MB
Claude Haiku 4.5	100	24 MB
Amazon Nova 2 Lite	100	18 MB
All Azure OpenAI GPT models	100	24 MB
All Appian GPT models	100	24 MB
Claude Sonnet 3.5 (legacy)	20	25 MB
Claude Sonnet 3.7 (legacy)	20	25 MB

Note: For "Text only" document processing mode, the maximum file size is 25 MB for all models.

Region-restricted AI models

Some AI models are not supported in all regions. Feature availability depends on whether the AI model's selected inference profile includes a region where the model is supported.

To ensure AI features continue to work as expected, make sure your environment uses an AI model that supports the inference profile for the region where your data is processed. Review your inference profile configuration in the Administration Console under AI Services.

AI model deprecation schedule

AI models are periodically deprecated by their respective providers, such as Anthropic and AWS. When this happens, Appian updates the available AI models to ensure the best performance, security, and compliance. Older models may be deprecated as part of this lifecycle. Appian communicates these changes in advance to help you plan transitions.

The following table lists all AI model deprecations, both past and scheduled. The Status column shows whether each deprecation has already taken effect or is still upcoming. Refer to AWS Bedrock documentation for the most up-to-date model information, including regional availability and deprecation dates.

Click any column heading to sort the table.

Model	Status	Deprecation date	Replacement	Impacted regions
Claude Haiku 3.5	Deprecated	February 19, 2026		All regions where this model is offered
Claude Sonnet 3.5 v2	Deprecated	March 1, 2026	Latest available Sonnet model	US East (N. Virginia), US West (Oregon), Europe (Frankfurt), Europe (Zurich)
Claude Sonnet 3.5 v2	Deprecated	June 1, 2026	Latest available Sonnet model	Europe (Zurich)
Claude Sonnet 3.5 v2	Deprecated	July 30, 2026	Latest available Sonnet model	GovCloud (US-West), GovCloud (US-East), Asia Pacific (Tokyo), Asia Pacific (Sydney)
Claude Sonnet 3	Deprecated	July 30, 2026	Latest available Sonnet model	Asia Pacific (Tokyo), Asia Pacific (Seoul), Asia Pacific (Sydney), Europe (Ireland), Europe (Paris), US East (N. Virginia), US West (Oregon)
Claude Haiku 3	Deprecated	September 10, 2026		Asia Pacific (Tokyo), Asia Pacific (Sydney), Europe (Frankfurt), Europe (Ireland), Europe (London), Europe (Paris), US East (N. Virginia), US West (Oregon), GovCloud (US-West), GovCloud (US-East)
Claude Sonnet 4	Deprecated	October 14, 2026	Latest available Sonnet model	All regions where this model is offered
Claude Haiku 3	Scheduled	November 13, 2026		Asia Pacific (Seoul), Asia Pacific (Mumbai), Asia Pacific (Singapore), Europe (Zurich), South America (Sao Paulo), Canada (Central)
Claude Sonnet 3.5 v2	Scheduled	November 13, 2026		Asia Pacific (Seoul), Asia Pacific (Mumbai), Asia Pacific (Singapore)
Claude Sonnet 3.7	Scheduled	November 13, 2026		Asia Pacific (Mumbai), Europe (London)
Claude Sonnet 3	Scheduled	November 13, 2026		Asia Pacific (Mumbai), Asia Pacific (Singapore), Canada (Central), Europe (London), South America (Sao Paulo)
Claude Sonnet 4.5	Scheduled	April 8, 2027		All regions where this model is offered

Note: Update your AI models before the deprecation date to prevent disruptions.

What happens when an AI model is deprecated

When an AI model is deprecated:

If the AI skill uses a specific model: Existing AI skills using the deprecated model continue to function until the model is fully removed. Appian provides advance notice so you can update your skills to use a replacement model.
Required actions: Administrators must update all AI skills and agents that use a specific deprecated model before the deprecation deadline to avoid service disruptions. AI skills using Auto mode do not require updates for model deprecations.
Regional implications: If a replacement model has different regional availability than the deprecated model, you must adjust your inference profile configuration.

Prepare for AI model deprecations

To ensure smooth operation of AI features and prepare for AI model changes:

Enabled AI models: Verify enabled AI models in the Administration Console under AI Services.
Inference profiles: Review inference profiles to ensure they include regions that support your required AI models.
Feature availability: Check feature availability in the Regional Availability page.
Deprecation timelines: Monitor deprecation timelines in the AI model deprecation schedule section and plan updates accordingly.
Testing: Test AI skills and agents after making any model or inference profile changes.
Release notes: Review release notes to stay informed about AI model updates and deprecations.

For more information about AI model configuration and availability, see the following pages:

For configuration, see AI Services.
For regional availability and inference profiles, see Regional Availability.
For data processing and encryption details, see Security & Compliance.

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