OpenAI LLM

OpenAI provides industry-leading language models. The plugin supports the Responses API (for GPT-5+) and ChatCompletionsLLM (any OpenAI-compatible API). Requires separate STT/TTS.

Vision Agents uses Stream Video for real-time WebRTC transport by default. External WebRTC transports are supported as well. Most AI providers offer free tiers to get started.

OpenAI also provides Realtime speech-to-speech and text-to-speech.

Installation

uv add "vision-agents[openai]"

LLM (Responses API)

Uses the Responses API (default for GPT-5+).

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

agent = Agent(
    edge=getstream.Edge(),
    agent_user=User(name="Assistant", id="agent"),
    instructions="You are a helpful assistant.",
    llm=openai.LLM(model="gpt-5.4"),
    stt=deepgram.STT(),
    tts=openai.TTS(),
)

Name	Type	Default	Description
model	str	"gpt-5.4"	Model (e.g., "gpt-5.4")
api_key	str	None	API key (defaults to OPENAI_API_KEY env var)
base_url	str	None	Custom API endpoint
max_tool_rounds	int	3	Maximum tool-call rounds per response

ChatCompletionsLLM

Works with any OpenAI-compatible API (Together AI, Fireworks, DeepSeek, etc.).

from vision_agents.plugins import openai

llm = openai.ChatCompletionsLLM(
    model="deepseek-chat",
    base_url="https://api.deepseek.com",
    api_key="your_api_key"
)

Name	Type	Default	Description
model	str	—	Model identifier
api_key	str	None	API key (defaults to OPENAI_API_KEY env var)
base_url	str	None	Custom API endpoint
tools_max_rounds	int	3	Maximum tool-call rounds per response

Function Calling

@agent.llm.register_function(description="Get weather for a location")
async def get_weather(location: str) -> dict:
    return {"temperature": "72°F", "condition": "Sunny"}

See the Function Calling guide for details.

Events

The OpenAI plugin no longer documents provider-specific event classes for normal app code. Prefer core events and provider-agnostic response handling.

Next Steps

OpenAI Realtime

Speech-to-speech over WebRTC

OpenAI TTS

Text-to-speech synthesis