Telnyx Voice AI Assistants now support GPT-5.1

Telnyx Voice AI Assistants can now run on GPT-5.1, which increases response quality and reduces latency for common dialog flows. This lets developers handle more turns with fewer retries and less custom prompt logic.

What’s new

• Model option: Select GPT-5.1 in Assistant settings or via API.
• Faster responses: Lower average latency for short and mid-length prompts.
• Instruction handling: Improved adherence to system and tool instructions.
• Tool reliability: Higher success rate when invoking multi-step workflow tools.
• Conversational tuning: More natural replies in long dialogs.

Why it matters

• Reduces caller wait time during back-and-forth exchanges.
• Improves task completion for structured workflows.
• Simplifies prompt design because the model follows constraints more reliably.
• Prevents failures in long interactions that rely on consistent tool outputs.

Example use cases

• Customer support flows that require multi-turn reasoning.
• Sales qualification calls with branching logic.
• Healthcare scheduling that depends on accurate tool invocation.
• Any conversational agent that needs faster and more natural responses.

Getting started

1. Open Mission Control Portal and navigate to AI Assistants.
2. Select an existing Assistant or create a new one.
3. Choose GPT-5.1 as the model in the configuration panel.
4. Test conversational and tool-based flows.

Try it out here Mission Control Protocol.