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OpenAI provides streaming text-to-speech synthesis.
Vision Agents requires a Stream account for real-time transport. Most providers offer free tiers to get started.
OpenAI also provides Realtime speech-to-speech and a traditional LLM.

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Installation

uv add "vision-agents[openai]"

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Quick Start

from vision_agents.core import Agent, User
from vision_agents.plugins import openai, deepgram, gemini, getstream

agent = Agent(
    edge=getstream.Edge(),
    agent_user=User(name="Assistant", id="agent"),
    instructions="You are a helpful assistant.",
    llm=gemini.LLM("gemini-3-flash-preview"),
    stt=deepgram.STT(),
    tts=openai.TTS(),
)

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Parameters

tts = openai.TTS(model="gpt-4o-mini-tts", voice="alloy")
NameTypeDefaultDescription
modelstr"gpt-4o-mini-tts"TTS model
voicestr"alloy"Voice (“alloy”, “echo”, “fable”, “onyx”, “nova”, “shimmer”)

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Next Steps

OpenAI LLM

Responses API and ChatCompletions

OpenAI Realtime

Speech-to-speech over WebRTC