language_models/base

calculateMaxTokens→ Promise<number>

getEmbeddingContextSize→ number

getModelContextSize→ number

Get the context window size (max input tokens) for a given model.

Context window sizes are sourced from official model documentation:

getModelNameForTiktoken→ TiktokenModel

isOpenAITool→ tool is ToolDefinition

Whether or not the input matches the OpenAI tool definition.

Classes

class

BaseLangChain

Base class for language models, chains, tools.

class

BaseLanguageModel

Base class for language models.

Interfaces

BaseFunctionCallOptions

BaseLangChainParams

BaseLanguageModelCallOptions

BaseLanguageModelInterface

Base interface implemented by all runnables. Used for cross-compatibility between different versions of LangChain core.

Should not change on patch releases.

BaseLanguageModelParams

Base interface for language model parameters. A subclass of BaseLanguageModel should have a constructor that takes in a parameter that extends this interface.

BaseLanguageModelTracingCallOptions

Shared interface for token usage return type from LLM calls.

ToolDefinition

Type Aliases

BaseLanguageModelInput: BasePromptValueInterface | string | BaseMessageLike[]

FunctionCallOption

LanguageModelLike: Runnable<BaseLanguageModelInput, LanguageModelOutput>

LanguageModelOutput: BaseMessage | string

SerializedLLM: __type & Record<string, any>

StructuredOutputMethodOptions