Changelog

New reasoning_effort field added to LLMConfig

The reasoning_effort field has been added to the LLMConfig object to control the amount of reasoning the model should perform, to support OpenAI’s o1 and o3 reasoning models.

New sender_id parameter added to Message model

The Message object now includes a sender_id field, which is the ID of the sender of the message, which can be either an identity ID or an agent ID. The sender_id is expected to be passed in at message creation time.

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from letta_client import Letta
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client = Letta(
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    token="YOUR_API_KEY",
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)
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messages = client.agents.messages.create(
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    agent_id="AGENT_ID",
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    messages=[
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        MessageCreate(
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            role="user",
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            content="Hello, how are you?",
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            sender_id="IDENTITY_ID",
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        )
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    ]
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)