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How to put a face on an OpenAI Realtime agent with Openspline

Wrap an existing OpenAI Realtime connection so the avatar speaks its replies.

  • Content
  • Advanced
  • 60 minutes
  • From the README
  • Any agent

Authorization notice. Openspline is dual-use. Only use it on software, sites and systems you own or have explicit permission to test.

Credentials. Keep OPENAI_API_KEY on the backend and never expose it to the browser.

Who it is forA developer whose agent already uses the OpenAI Realtime API and needs a visual avatar without rewriting event handling.

The problemA Realtime agent plays audio only, and wiring audio to a video avatar by hand is error prone.

The outcomeThe existing Realtime event handler keeps working while the avatar speaks the agent's audio.

What you need first

  • A portrait image of the face to animate, with rights to use it
  • Python 3.x or Node 20+ for the SDK
  • Either an OpenSpline Cloud API key or a Linux or WSL2 machine with an NVIDIA GPU
  • An existing voice AI agent or a TTS provider that outputs PCM audio

Steps

  1. Run pip install openai==2.54.0.
  2. Set OPENAI_API_KEY in your backend environment.
  3. Open the avatar with async with Openspline().avatar("portrait.jpg") as avatar: and wait with await avatar.wait_for_viewer().
  4. Create adapter = OpenAIRealtime(avatar, connection) and loop over adapter.wrap(connection), passing each event to your handler.
  5. Disable your previous speaker output so audio does not play twice, then run OPENAI_API_KEY=... python examples/python/openai_realtime.py portrait.jpg.

Prompt for your agent

Use the openspline repo (github.com/openspline/openspline) to add the OpenAIRealtime adapter to the agent in <path-to-agent>, keeping its existing event handler. Use portrait <path-to-portrait.jpg>. Confirm the speaker output is disabled so audio plays once, and report the viewer URL.

Caveat. The README pins openai==2.54.0 for this connector, so newer SDK versions may not match the example.

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