Voice Agents

All Letta agents can be connected to a voice provider by using the OpenAI-compatible streaming chat completions endpoint at https://api.letta.com/v1/chat/completions. Any standard Letta agent can be used for voice applications.

Creating a voice agent

You can create a voice agent using the standard Letta agent creation flow:

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from letta_client import Letta
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import os
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client = Letta(token=os.getenv('LETTA_API_KEY'))
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# create the Letta agent
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agent = client.agents.create(
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    memory_blocks=[
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        {"value": "Name: ?", "label": "human"},
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        {"value": "You are a helpful assistant.", "label": "persona"},
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    ],
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    model="openai/gpt-4o-mini"  # Use 4o-mini for speed
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)

You can attach additional tools and blocks to this agent just as you would any other Letta agent.