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Streaming Helpers

OpenAI supports streaming responses when interacting with the Assistant APIs.

Assistant Streaming API

OpenAI supports streaming responses from Assistants. The SDK provides convenience wrappers around the API so you can subscribe to the types of events you are interested in as well as receive accumulated responses.

More information can be found in the documentation: Assistant Streaming

An example of creating a run and subscribing to some events

You can subscribe to events by creating an event handler class and overloading the relevant event handlers.

from typing_extensions import override
from openai import AssistantEventHandler, OpenAI
from openai.types.beta.threads import Text, TextDelta
from openai.types.beta.threads.runs import ToolCall, ToolCallDelta

client = openai.OpenAI()

# First, we create a EventHandler class to define
# how we want to handle the events in the response stream.

class EventHandler(AssistantEventHandler):
  @override
  def on_text_created(self, text: Text) -> None:
    print(f"\nassistant > ", end="", flush=True)

  @override
  def on_text_delta(self, delta: TextDelta, snapshot: Text):
    print(delta.value, end="", flush=True)

  def on_tool_call_created(self, tool_call: ToolCall):
    print(f"\nassistant > {tool_call.type}\n", flush=True)

  def on_tool_call_delta(self, delta: ToolCallDelta, snapshot: ToolCall):
    if delta.type == 'code_interpreter':
      if delta.code_interpreter.input:
        print(delta.code_interpreter.input, end="", flush=True)
      if delta.code_interpreter.outputs:
        print(f"\n\noutput >", flush=True)
        for output in delta.code_interpreter.outputs:
          if output.type == "logs":
            print(f"\n{output.logs}", flush=True)

# Then, we use the `create_and_stream` SDK helper
# with the `EventHandler` class to create the Run
# and stream the response.

with client.beta.threads.runs.create_and_stream(
  thread_id="thread_id",
  assistant_id="assistant_id",
  event_handler=EventHandler(),
) as stream:
  stream.until_done()

An example of iterating over events

You can also iterate over all the streamed events.

with client.beta.threads.runs.create_and_stream(
  thread_id=thread.id,
  assistant_id=assistant.id
) as stream:
    for event in stream:
        # Print the text from text delta events
        if event.type == "thread.message.delta" and event.data.delta.content:
            print(event.data.delta.content[0].text)

An example of iterating over text

You can also iterate over just the text deltas received

with client.beta.threads.runs.create_and_stream(
  thread_id=thread.id,
  assistant_id=assistant.id
) as stream:
    for text in stream.text_deltas:
        print(text)

Creating Streams

There are three helper methods for creating streams:

client.beta.threads.runs.create_and_stream()

This method can be used to start and stream the response to an existing run with an associated thread that is already populated with messages.

client.beta.threads.create_and_run_stream()

This method can be used to add a message to a thread, start a run and then stream the response.

client.beta.threads.runs.submit_tool_outputs_stream()

This method can be used to submit a tool output to a run waiting on the output and start a stream.

Assistant Events

The assistant API provides events you can subscribe to for the following events.

def on_event(self, event: AssistantStreamEvent)

This allows you to subscribe to all the possible raw events sent by the OpenAI streaming API. In many cases it will be more convenient to subscribe to a more specific set of events for your use case.

More information on the types of events can be found here: Events

def on_run_step_created(self, run_step: RunStep)
def on_run_step_delta(self, delta: RunStepDelta, snapshot: RunStep)
def on_run_step_done(self, run_step: RunStep)

These events allow you to subscribe to the creation, delta and completion of a RunStep.

For more information on how Runs and RunSteps work see the documentation Runs and RunSteps

def on_message_created(self, message: Message)
def on_message_delta(self, delta: MessageDelta, snapshot: Message)
def on_message_done(self, message: Message)

This allows you to subscribe to Message creation, delta and completion events. Messages can contain different types of content that can be sent from a model (and events are available for specific content types). For convenience, the delta event includes both the incremental update and an accumulated snapshot of the content.

More information on messages can be found on in the documentation page Message.

def on_text_created(self, text: Text)
def on_text_delta(self, delta: TextDelta, snapshot: Text)
def on_text_done(self, text: Text)

These events allow you to subscribe to the creation, delta and completion of a Text content (a specific type of message). For convenience, the delta event includes both the incremental update and an accumulated snapshot of the content.

def on_image_file_done(self, image_file: ImageFile)

Image files are not sent incrementally so an event is provided for when a image file is available.

def on_tool_call_created(self, tool_call: ToolCall)
def on_tool_call_delta(self, delta: ToolCallDelta, snapshot: ToolCall)
def on_tool_call_done(self, tool_call: ToolCall)

These events allow you to subscribe to events for the creation, delta and completion of a ToolCall.

More information on tools can be found here Tools

def on_end(self)

The last event send when a stream ends.

def on_timeout(self)

This event is triggered if the request times out.

def on_exception(self, exception: Exception)

This event is triggered if an exception occurs during streaming.

Assistant Methods

The assistant streaming object also provides a few methods for convenience:

def current_event() -> AssistantStreamEvent | None
def current_run() -> Run | None
def current_message_snapshot() -> Message | None
def current_run_step_snapshot() -> RunStep | None

These methods are provided to allow you to access additional context from within event handlers. In many cases the handlers should include all the information you need for processing, but if additional context is required it can be accessed.

Note: There is not always a relevant context in certain situations (these will be None in those cases).

def get_final_run(self) -> Run
def get_final_run_steps(self) -> List[RunStep]
def get_final_messages(self) -> List[Message]

These methods are provided for convenience to collect information at the end of a stream. Calling these events will trigger consumption of the stream until completion and then return the relevant accumulated objects.