Retell AI API · Endpoint removal
states on PATCH /update-retell-llm/{} stops working
Stops working (in 101 days)
Calls to PATCH /update-retell-llm/{}, body parameter states on Retell AI API stop working on February 1, 2027.
What to use instead of these calls
Edit the agent as a conversation flow with PATCH /update-conversation-flow/{conversation_flow_id} instead.
Multi-prompt agents have no direct API equivalent: rebuilding one as a conversation flow changes how it handles calls and needs testing.
Calls it hits
PATCH /update-retell-llm/{}body parameter states
Retell is retiring multi-prompt agents in favor of conversation flow. New multi-prompt creation ends on 12/15/2026, and editing ends on 02/01/2027.
Facts
- API
- Retell AI API
api.retellai.com - Kind
- Endpoint removal
- Takes effect
- February 1, 2027
- Calls after that day
- Fail
- Source
- Announcement
- Last updated
More from Retell AI API
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