Abstract Class: ChunkingStrategy

September 24, 2025 ยท View on GitHub

@cdklabs/generative-ai-cdk-constructs

@cdklabs/generative-ai-cdk-constructs / bedrock / ChunkingStrategy

Abstract Class: ChunkingStrategy

Properties

configuration

abstract configuration: ChunkingConfigurationProperty

The CloudFormation property representation of this configuration

DEFAULT

readonly static DEFAULT: ChunkingStrategy

Fixed Sized Chunking with the default chunk size of 300 tokens and 20% overlap.

FIXED_SIZE

readonly static FIXED_SIZE: ChunkingStrategy

Fixed Sized Chunking with the default chunk size of 300 tokens and 20% overlap. You can adjust these values based on your specific requirements using the ChunkingStrategy.fixedSize(params) method.

HIERARCHICAL_COHERE

readonly static HIERARCHICAL_COHERE: ChunkingStrategy

Hierarchical Chunking with the default for Cohere Models.

  • Overlap tokens: 30
  • Max parent token size: 500
  • Max child token size: 100

HIERARCHICAL_TITAN

readonly static HIERARCHICAL_TITAN: ChunkingStrategy

Hierarchical Chunking with the default for Titan Models.

  • Overlap tokens: 60
  • Max parent token size: 1500
  • Max child token size: 300

NONE

readonly static NONE: ChunkingStrategy

Amazon Bedrock treats each file as one chunk. Suitable for documents that are already pre-processed or text split.

SEMANTIC

readonly static SEMANTIC: ChunkingStrategy

Semantic Chunking with the default of bufferSize: 0, breakpointPercentileThreshold: 95, and maxTokens: 300. You can adjust these values based on your specific requirements using the ChunkingStrategy.semantic(params) method.

Methods

fixedSize()

static fixedSize(props): ChunkingStrategy

Method for customizing a fixed sized chunking strategy.

Parameters

props

FixedSizeChunkingConfigurationProperty

Returns

ChunkingStrategy

hierarchical()

static hierarchical(props): ChunkingStrategy

Method for customizing a hierarchical chunking strategy. For custom chunking, the maximum token chunk size depends on the model.

  • Amazon Titan Text Embeddings: 8192
  • Cohere Embed models: 512

Parameters

props

HierarchicalChunkingProps

Returns

ChunkingStrategy

semantic()

static semantic(props): ChunkingStrategy

Method for customizing a semantic chunking strategy. For custom chunking, the maximum token chunk size depends on the model.

  • Amazon Titan Text Embeddings: 8192
  • Cohere Embed models: 512

Parameters

props

SemanticChunkingConfigurationProperty

Returns

ChunkingStrategy