[Enhancement]: Allow PDF > 4.5MB when using 'Upload to provider' on bedrock with claude/nova models

[btribonde]

What features would you like to see added?

Hello,

LibreChat currently rejects Bedrock document uploads above 4.5 MB with an error like:

Document validation failed: File size (8.6MB) exceeds the 4.5MB limit for Bedrock

However, AWS Bedrock documentation now describes model-specific exceptions to the 4.5 MB document limit:

• For Claude 4 and subsequent versions, the 4.5 MB document size restriction does not apply to PDF
• For Nova models, the 4.5 MB document size restriction does not apply to PDF and DOCX

Relevant AWS docs:

• https://docs.aws.amazon.com/bedrock/latest/userguide/inference-api-restrictions.html
• https://docs.aws.amazon.com/nova/latest/userguide/modalities-document.html
• https://docs.aws.amazon.com/nova/latest/nova2-userguide/using-multimodal-models.html#document-understanding

Current LibreChat behavior

The current Bedrock validation path appears to enforce a hard 4.5 MB limit for all Bedrock documents, including PDFs:

• packages/api/src/files/validation.ts
• validatePdf(...) routes Bedrock PDFs to validateBedrockDocument(...)
• validateBedrockDocument(...) sets providerLimit = mbToBytes(4.5) and returns:
  • File size (...) exceeds the ... limit for Bedrock

LibreChat docs also currently state:

• "AWS Bedrock Document Upload Limits"
• "Maximum file size per document: 4.5 MB"

So both the implementation and docs seem to reflect the older / more conservative Bedrock rule rather than the newer model-specific exceptions.

Why this is a problem

This prevents valid Bedrock uploads for models that now support larger media documents through the API.

Examples:

• Claude 4 / 4.5 on Bedrock should be able to accept PDFs above 4.5 MB
• Nova should be able to accept PDF/DOCX media documents above 4.5 MB

This means LibreChat may reject files client/server-side that Bedrock would otherwise accept.

Reproduction

1. Configure an AWS Bedrock endpoint in LibreChat
2. Select a Claude 4+ model (for example Claude Sonnet 4 / 4.5) or a Nova model
3. Choose Upload to Provider
4. Attach:
   • a PDF > 4.5 MB for Claude 4+
   • or a PDF / DOCX > 4.5 MB for Nova
5. Send the message

Actual behavior

LibreChat rejects the upload before the request is sent to Bedrock, with an error such as:

Document validation failed: File size (8.6MB) exceeds the 4.5MB limit for Bedrock

Expected behavior

Bedrock validation should be model-aware instead of applying a blanket 4.5 MB rule to all documents.

Suggested behavior:

For Anthropic Claude on Bedrock

• If model is Claude 4 or later and file type is PDF:
  • do not enforce the 4.5 MB per-document validator
  • still enforce other applicable constraints (for example request-size / page-count / encryption checks where relevant)

For Amazon Nova on Bedrock

• If model is Nova and file type is PDF or DOCX:
  • do not enforce the 4.5 MB per-document validator
  • instead validate against Nova’s media-document rules

For other Bedrock models / document types

• keep the existing 4.5 MB validation where appropriate

Important note about AWS docs inconsistency

• The Bedrock User Guide says Claude 4+ PDFs and Nova PDF/DOCX are exceptions to the 4.5 MB limit
• But the Bedrock API Reference still says each document must be no more than 4.5 MB

Relevant API reference:

• https://docs.aws.amazon.com/bedrock/latest/APIReference/API_runtime_Message.html

Additional Claude PDF note: visual PDF support on Bedrock

Anthropic’s Bedrock PDF documentation says that on Bedrock Converse API there are two PDF modes:

• without citations: basic text extraction only
• with citations enabled: full visual PDF understanding (charts, images, layout)

Relevant docs:

• https://platform.claude.com/docs/en/build-with-claude/pdf-support
• https://docs.aws.amazon.com/bedrock/latest/userguide/model-parameters-claude.html

So there may be a second improvement area here:

Optional enhancement

Support Bedrock Claude PDF uploads in a way that can expose or enable the citations path for "visual PDF" understanding.

Maybe could be a path for a new OCR endpoint using bedrock Claude visual understanding for PDF.

Thanks!

More details

NA

Which components are impacted by your request?

Endpoints

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