---
title: GPT-5.1 now available in Telnyx Voice AI Assistants
canonical: https://telnyx.com/release-notes/voice-ai-assistants-gpt-5-1-support
---
# GPT-5.1 now available in Telnyx Voice AI Assistants

[Release notes](https://telnyx.com/release-notes)

# Telnyx Voice AI Assistants now support GPT-5.1

### 17, Nov 2025

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](https://portal.telnyx.com/#/ai/assistants) 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](https://portal.telnyx.com/#/ai/assistants).

[Start building](https://telnyx.com/sign-up)

### Ask AI

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* [![Claude](https://d2efw2akbx8gaf.cloudfront.net/https://dotcom-payload-assets-prod.s3.us-east-1.amazonaws.com/cms-media/claude_icon-c7c8eef3.webp?width=92&format=webp)](https://claude.ai/new?q=What makes Telnyx's global network different, breakdown call quality for normal phone calls and voice AI calls.)
* [![Perplexity](https://d2efw2akbx8gaf.cloudfront.net/https://dotcom-payload-assets-prod.s3.us-east-1.amazonaws.com/cms-media/perplexity_icon-cd5b74f1.webp?width=92&format=webp)](https://www.perplexity.ai/search?q=What makes Telnyx's global network different, breakdown call quality for normal phone calls and voice AI calls.)
* [![Gemini](https://d2efw2akbx8gaf.cloudfront.net/https://dotcom-payload-assets-prod.s3.us-east-1.amazonaws.com/cms-media/gemini_icon-4ff1cbf4.webp?width=92&format=webp)](https://www.google.com/search?udm=50&aep=11&q=What makes Telnyx's global network different, breakdown call quality for normal phone calls and voice AI calls.)
* [![Grok](https://d2efw2akbx8gaf.cloudfront.net/https://dotcom-payload-assets-prod.s3.us-east-1.amazonaws.com/cms-media/grok_icon-e588e5bd.webp?width=92&format=webp)](https://x.com/i/grok?text=What makes Telnyx's global network different, breakdown call quality for normal phone calls and voice AI calls.)