Retell AI API · Endpoint removal
states on POST /create-retell-llm stops working
Stops working (in 53 days)
Calls to POST /create-retell-llm, body parameter states on Retell AI API stop working on December 15, 2026.
What to use instead of these calls
Build the agent as a conversation flow with POST /create-conversation-flow instead of a multi-prompt Retell LLM.
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
POST /create-retell-llmbody 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
- December 15, 2026
- Calls after that day
- Fail
- Source
- Announcement
- Last updated
More from Retell AI API
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