Tell-1
- Family
- Tell
- Released
- 2026-11-13
- Specialization
- agentic
- Openness
- Proprietary
- License
- ProprietaryRestricted
- Weights
- Not released
- Code
- Unknown
List rate of 1 route · Retell AI
About
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.
Providers(1)
Compare published per-minute API pricing across 1 tracked provider route.
| Provider | Audio / min | Route |
|---|---|---|
| Retell AI | $0.035/min | Serverless |
Capabilities
Benchmark peer barsfor Agents
No task-mapped benchmark peers are available for this model yet.
Migration checks
No linked migration route is available for this model yet.
API versions
tell-1