Last refreshed 2026-11-14. Next refresh: weekly.
Why use Tell-1 on Retell AI?
Retell AI offers Tell-1 with pay-as-you-go pricing at $0.035/minute. Retell AI is a platform for AI phone and chat agents, billed per call minute or per chat message.
Setup recipe
Docs fallbackUse the provider REST API or SDKCreate a provider API keymodel: tell-1tell-1Request example
tell-1.Gotchas
No curated gotchas have been sourced for this exact provider/model route yet.
Pricing
| Type | Rate |
|---|---|
| Audio minute | $0.035/min |
Capabilities
About Tell-1
Tell-1 is Retell AI's in-house language model for contact-center voice agents, announced November 13, 2026. It uses interleaved reasoning. It starts its spoken reply right away, then reasons silently while the first sentence plays: which business rule applies, what information is missing, and whether to call a tool. It then continues the reply, and the reasoning is never spoken. Retell trained it in three stages on curated production conversations: supervised fine-tuning, DPO preference tuning and reinforcement learning. The rewards cover correct tool calls, avoiding hallucination, instruction following and natural phone speech.