Changelog

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This changelog provides granular, real-time updates as changes are released. For a monthly summary of platform changes, see the Synthflow product changelog on our feedback portal.

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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