The
override_dynamic_variables input on Update Call is deprecated, and Update Call becomes ended-calls-only. Changes you make through Update Call — including data_storage_setting, which previously took effect mid-call — now apply only to ended calls. Use the new Update Live Call API to override dynamic variables or change data_storage_setting on ongoing calls.Impacted API endpoints:- Update Call — field:
override_dynamic_variables
Legacy list endpoints and analysis prompt fields will be removed. Migrate to the versioned list endpoints (v2/v3) and to
post_call_analysis_data / post_chat_analysis_data system presets.Impacted API endpoints:- List Batch Tests, List Conversation Flow Components, List Conversation Flows, List Phone Numbers, List Retell LLMs, List Test Case Definitions, List Test Runs, List Calls, List Chats — endpoints replaced by versioned (v2/v3) equivalents
- Create Agent, Update Agent, Create Chat Agent, Update Chat Agent — fields:
analysis_summary_prompt,analysis_successful_prompt,analysis_user_sentiment_prompt
Claude and Gemini models are being deprecated and automatically migrated to newer versions on 5/25/2026.Read more.
The
tools and tool_ids fields on type: "conversation" nodes are deprecated in favor of the new subagent node type.Impacted API endpoints:- Create Conversation Flow, Update Conversation Flow, Get Conversation Flow, List Conversation Flows, Create Conversation Flow Component, Update Conversation Flow Component, Get Conversation Flow Component, List Conversation Flow Components — fields:
tools,tool_ids(ontype: "conversation"nodes)
OpenAI Realtime and Cartesia Sonic models are being deprecated and replaced with newer versions. After 4/3/2026, the deprecated models will no longer be available.Read more.
The single-agent fields on phone number configuration are deprecated in favor of the weighted
*_agents lists.Impacted API endpoints:- Create Phone Number, Import Phone Number, Update Phone Number, Get Phone Number, List Phone Numbers — fields:
inbound_agent_id,inbound_agent_version,outbound_agent_id,outbound_agent_version,inbound_sms_agent_id,inbound_sms_agent_version,outbound_sms_agent_id,outbound_sms_agent_version
show_transferee_as_caller no longer toggles SIP REFER vs SIP INVITE in Cold Transfer options. Use the new cold_transfer_mode parameter instead; show_transferee_as_caller now only controls caller ID display under sip_invite.Impacted API endpoints:- Create Retell LLM, Update Retell LLM, Create Conversation Flow, Update Conversation Flow, Create Conversation Flow Component, Update Conversation Flow Component — field:
show_transferee_as_caller