Index

LLM

Bases: BaseLLM

The LLM class is the main class for interacting with language models.

Attributes:

Name	Type	Description
system_prompt	Optional[str]	System prompt for LLM calls.
messages_to_prompt	Callable	Function to convert a list of messages to an LLM prompt.
completion_to_prompt	Callable	Function to convert a completion to an LLM prompt.
output_parser	Optional[BaseOutputParser]	Output parser to parse, validate, and correct errors programmatically.
pydantic_program_mode	PydanticProgramMode	Pydantic program mode to use for structured prediction.

metadata abstractmethod property

metadata: LLMMetadata

LLM metadata.

Returns:

Name	Type	Description
LLMMetadata	LLMMetadata	LLM metadata containing various information about the LLM.

class_name classmethod

class_name() -> str

Get the class name, used as a unique ID in serialization.

This provides a key that makes serialization robust against actual class name changes.

as_query_component

as_query_component(partial: Optional[Dict[str, Any]] = None, **kwargs: Any) -> QueryComponent

Get query component.

chat abstractmethod

chat(messages: Sequence[ChatMessage], **kwargs: Any) -> ChatResponse

Chat endpoint for LLM.

Parameters:

Name	Type	Description	Default
messages	Sequence[ChatMessage]	Sequence of chat messages.	required
kwargs	Any	Additional keyword arguments to pass to the LLM.	{}

Returns:

Name	Type	Description
ChatResponse	ChatResponse	Chat response from the LLM.

Examples:

from llama_index.core.llms import ChatMessage

response = llm.chat([ChatMessage(role="user", content="Hello")])
print(response.content)

complete abstractmethod

complete(prompt: str, formatted: bool = False, **kwargs: Any) -> CompletionResponse

Completion endpoint for LLM.

If the LLM is a chat model, the prompt is transformed into a single user message.

Parameters:

Name	Type	Description	Default
prompt	str	Prompt to send to the LLM.	required
formatted	bool	Whether the prompt is already formatted for the LLM, by default False.	False
kwargs	Any	Additional keyword arguments to pass to the LLM.	{}

Returns:

Name	Type	Description
CompletionResponse	CompletionResponse	Completion response from the LLM.

Examples:

response = llm.complete("your prompt")
print(response.text)

stream_chat abstractmethod

stream_chat(messages: Sequence[ChatMessage], **kwargs: Any) -> ChatResponseGen

Streaming chat endpoint for LLM.

Parameters:

Name	Type	Description	Default
messages	Sequence[ChatMessage]	Sequence of chat messages.	required
kwargs	Any	Additional keyword arguments to pass to the LLM.	{}

Yields:

Name	Type	Description
ChatResponse	ChatResponseGen	A generator of ChatResponse objects, each containing a new token of the response.

Examples:

from llama_index.core.llms import ChatMessage

gen = llm.stream_chat([ChatMessage(role="user", content="Hello")])
for response in gen:
    print(response.delta, end="", flush=True)

stream_complete abstractmethod

stream_complete(prompt: str, formatted: bool = False, **kwargs: Any) -> CompletionResponseGen

Streaming completion endpoint for LLM.

If the LLM is a chat model, the prompt is transformed into a single user message.

Parameters:

Name	Type	Description	Default
prompt	str	Prompt to send to the LLM.	required
formatted	bool	Whether the prompt is already formatted for the LLM, by default False.	False
kwargs	Any	Additional keyword arguments to pass to the LLM.	{}

Yields:

Name	Type	Description
CompletionResponse	CompletionResponseGen	A generator of CompletionResponse objects, each containing a new token of the response.

Examples:

gen = llm.stream_complete("your prompt")
for response in gen:
    print(response.text, end="", flush=True)

achat abstractmethod async

achat(messages: Sequence[ChatMessage], **kwargs: Any) -> ChatResponse

Async chat endpoint for LLM.

Parameters:

Name	Type	Description	Default
messages	Sequence[ChatMessage]	Sequence of chat messages.	required
kwargs	Any	Additional keyword arguments to pass to the LLM.	{}

Returns:

Name	Type	Description
ChatResponse	ChatResponse	Chat response from the LLM.

Examples:

from llama_index.core.llms import ChatMessage

response = await llm.achat([ChatMessage(role="user", content="Hello")])
print(response.content)

acomplete abstractmethod async

acomplete(prompt: str, formatted: bool = False, **kwargs: Any) -> CompletionResponse

Async completion endpoint for LLM.

If the LLM is a chat model, the prompt is transformed into a single user message.

Parameters:

Name	Type	Description	Default
prompt	str	Prompt to send to the LLM.	required
formatted	bool	Whether the prompt is already formatted for the LLM, by default False.	False
kwargs	Any	Additional keyword arguments to pass to the LLM.	{}

Returns:

Name	Type	Description
CompletionResponse	CompletionResponse	Completion response from the LLM.

Examples:

response = await llm.acomplete("your prompt")
print(response.text)

astream_chat abstractmethod async

astream_chat(messages: Sequence[ChatMessage], **kwargs: Any) -> ChatResponseAsyncGen

Async streaming chat endpoint for LLM.

Parameters:

Name	Type	Description	Default
messages	Sequence[ChatMessage]	Sequence of chat messages.	required
kwargs	Any	Additional keyword arguments to pass to the LLM.	{}

Yields:

Name	Type	Description
ChatResponse	ChatResponseAsyncGen	An async generator of ChatResponse objects, each containing a new token of the response.

Examples:

from llama_index.core.llms import ChatMessage

gen = await llm.astream_chat([ChatMessage(role="user", content="Hello")])
async for response in gen:
    print(response.delta, end="", flush=True)

astream_complete abstractmethod async

astream_complete(prompt: str, formatted: bool = False, **kwargs: Any) -> CompletionResponseAsyncGen

Async streaming completion endpoint for LLM.

If the LLM is a chat model, the prompt is transformed into a single user message.

Parameters:

Name	Type	Description	Default
prompt	str	Prompt to send to the LLM.	required
formatted	bool	Whether the prompt is already formatted for the LLM, by default False.	False
kwargs	Any	Additional keyword arguments to pass to the LLM.	{}

Yields:

Name	Type	Description
CompletionResponse	CompletionResponseAsyncGen	An async generator of CompletionResponse objects, each containing a new token of the response.

Examples:

gen = await llm.astream_complete("your prompt")
async for response in gen:
    print(response.text, end="", flush=True)

structured_predict

structured_predict(output_cls: BaseModel, prompt: PromptTemplate, **prompt_args: Any) -> BaseModel

Structured predict.

Parameters:

Name	Type	Description	Default
output_cls	BaseModel	Output class to use for structured prediction.	required
prompt	PromptTemplate	Prompt template to use for structured prediction.	required
prompt_args	Any	Additional arguments to format the prompt with.	{}

Returns:

Name	Type	Description
BaseModel	BaseModel	The structured prediction output.

Examples:

from pydantic.v1 import BaseModel

class Test(BaseModel):
    \"\"\"My test class.\"\"\"
    name: str

from llama_index.core.prompts import PromptTemplate

prompt = PromptTemplate("Please predict a Test with a random name related to {topic}.")
output = llm.structured_predict(Test, prompt, topic="cats")
print(output.name)

astructured_predict async

astructured_predict(output_cls: BaseModel, prompt: PromptTemplate, **prompt_args: Any) -> BaseModel

Async Structured predict.

Parameters:

Name	Type	Description	Default
output_cls	BaseModel	Output class to use for structured prediction.	required
prompt	PromptTemplate	Prompt template to use for structured prediction.	required
prompt_args	Any	Additional arguments to format the prompt with.	{}

Returns:

Name	Type	Description
BaseModel	BaseModel	The structured prediction output.

Examples:

from pydantic.v1 import BaseModel

class Test(BaseModel):
    \"\"\"My test class.\"\"\"
    name: str

from llama_index.core.prompts import PromptTemplate

prompt = PromptTemplate("Please predict a Test with a random name related to {topic}.")
output = await llm.astructured_predict(Test, prompt, topic="cats")
print(output.name)

stream_structured_predict

stream_structured_predict(output_cls: BaseModel, prompt: PromptTemplate, **prompt_args: Any) -> Generator[Union[Model, List[Model]], None, None]

Stream Structured predict.

Parameters:

Name	Type	Description	Default
output_cls	BaseModel	Output class to use for structured prediction.	required
prompt	PromptTemplate	Prompt template to use for structured prediction.	required
prompt_args	Any	Additional arguments to format the prompt with.	{}

Returns:

Name	Type	Description
Generator	Generator[Union[Model, List[Model]], None, None]	A generator returning partial copies of the model or list of models.

Examples:

from pydantic.v1 import BaseModel

class Test(BaseModel):
    \"\"\"My test class.\"\"\"
    name: str

from llama_index.core.prompts import PromptTemplate

prompt = PromptTemplate("Please predict a Test with a random name related to {topic}.")
stream_output = llm.stream_structured_predict(Test, prompt, topic="cats")
for partial_output in stream_output:
    # stream partial outputs until completion
    print(partial_output.name)

astream_structured_predict async

astream_structured_predict(output_cls: BaseModel, prompt: PromptTemplate, **prompt_args: Any) -> AsyncGenerator[Union[Model, List[Model]], None]

Async Stream Structured predict.

Parameters:

Name	Type	Description	Default
output_cls	BaseModel	Output class to use for structured prediction.	required
prompt	PromptTemplate	Prompt template to use for structured prediction.	required
prompt_args	Any	Additional arguments to format the prompt with.	{}

Returns:

Name	Type	Description
Generator	AsyncGenerator[Union[Model, List[Model]], None]	A generator returning partial copies of the model or list of models.

Examples:

from pydantic.v1 import BaseModel

class Test(BaseModel):
    \"\"\"My test class.\"\"\"
    name: str

from llama_index.core.prompts import PromptTemplate

prompt = PromptTemplate("Please predict a Test with a random name related to {topic}.")
stream_output = await llm.astream_structured_predict(Test, prompt, topic="cats")
async for partial_output in stream_output:
    # stream partial outputs until completion
    print(partial_output.name)

predict

predict(prompt: BasePromptTemplate, **prompt_args: Any) -> str

Predict for a given prompt.

Parameters:

Name	Type	Description	Default
prompt	BasePromptTemplate	The prompt to use for prediction.	required
prompt_args	Any	Additional arguments to format the prompt with.	{}

Returns:

Name	Type	Description
str	str	The prediction output.

Examples:

from llama_index.core.prompts import PromptTemplate

prompt = PromptTemplate("Please write a random name related to {topic}.")
output = llm.predict(prompt, topic="cats")
print(output)

stream

stream(prompt: BasePromptTemplate, **prompt_args: Any) -> TokenGen

Stream predict for a given prompt.

Parameters:

Name	Type	Description	Default
prompt	BasePromptTemplate	The prompt to use for prediction.	required
prompt_args	Any	Additional arguments to format the prompt with.	{}

Yields:

Name	Type	Description
str	TokenGen	Each streamed token.

Examples:

from llama_index.core.prompts import PromptTemplate

prompt = PromptTemplate("Please write a random name related to {topic}.")
gen = llm.stream_predict(prompt, topic="cats")
for token in gen:
    print(token, end="", flush=True)

apredict async

apredict(prompt: BasePromptTemplate, **prompt_args: Any) -> str

Async Predict for a given prompt.

Parameters:

Name	Type	Description	Default
prompt	BasePromptTemplate	The prompt to use for prediction.	required
prompt_args	Any	Additional arguments to format the prompt with.	{}

Returns:

Name	Type	Description
str	str	The prediction output.

Examples:

from llama_index.core.prompts import PromptTemplate

prompt = PromptTemplate("Please write a random name related to {topic}.")
output = await llm.apredict(prompt, topic="cats")
print(output)

astream async

astream(prompt: BasePromptTemplate, **prompt_args: Any) -> TokenAsyncGen

Async stream predict for a given prompt.

prompt (BasePromptTemplate): The prompt to use for prediction. prompt_args (Any): Additional arguments to format the prompt with.

Yields:

Name	Type	Description
str	TokenAsyncGen	An async generator that yields strings of tokens.

Examples:

from llama_index.core.prompts import PromptTemplate

prompt = PromptTemplate("Please write a random name related to {topic}.")
gen = await llm.astream_predict(prompt, topic="cats")
async for token in gen:
    print(token, end="", flush=True)

predict_and_call

predict_and_call(tools: List[BaseTool], user_msg: Optional[Union[str, ChatMessage]] = None, chat_history: Optional[List[ChatMessage]] = None, verbose: bool = False, **kwargs: Any) -> AgentChatResponse

Predict and call the tool.

By default uses a ReAct agent to do tool calling (through text prompting), but function calling LLMs will implement this differently.

apredict_and_call async

apredict_and_call(tools: List[BaseTool], user_msg: Optional[Union[str, ChatMessage]] = None, chat_history: Optional[List[ChatMessage]] = None, verbose: bool = False, **kwargs: Any) -> AgentChatResponse

Predict and call the tool.

as_structured_llm

as_structured_llm(output_cls: BaseModel, **kwargs: Any) -> StructuredLLM

Return a structured LLM around a given object.