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Changelog

New features, fixes, and API updates, shipped continuously.

March 10, 2026

Updated supported LLM models

The list of available AI models has been updated. New models have been added and GPT-4o has been removed.

New models:

ModelDescription
gpt-4.1-nanoLightweight variant of GPT-4.1 optimized for speed and cost
gpt-5-miniCompact GPT-5 variant balancing performance and cost
gpt-5-nanoLightweight GPT-5 variant optimized for speed and cost
synthflowOptimized for real-time, natural phone conversations

Updated endpoints:

EndpointTitle
POST /assistantsCreate an agent
PUT /assistants/{model_id}Update an agent