---
title: "Expanded LLM Support for Telnyx Voice AI Agents: GPT-5 and Groq"
canonical: https://telnyx.com/release-notes/gpt-5-groq-gpt-oss-120b-llm-support
---
# Expanded LLM Support for Telnyx Voice AI Agents: GPT-5 and Groq

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

# Expanded LLM Support: GPT-5 and Groq gpt-oss-120b for Voice AI Agents

### 8, Aug 2025

Telnyx is excited to announce expanded LLM support for [Voice AI Agents](https://telnyx.com/products/voice-ai-agents), adding OpenAI’s GPT-5 and Groq’s gpt-oss-120b to your agent’s toolkit. These models open up new possibilities for delivering lifelike, real-time conversations with more choice, flexibility, and cost efficiency.

## What’s new

* **Support for OpenAI GPT-5** with minimal reasoning effort enabled by default for real-time voice suitability.
* **Support for Groq gpt-oss-120b** for high-speed, open-source performance.
* **Seamless integration** with the AI Assistant Builder so you can test instantly.

## Key benefits

* **Lower latency and pricing for GPT-5:** Response times stay under real-time thresholds, and aggressively low cached input costs make it ideal for voice agents where most tokens are cached.
* **Open-source acceleration:** Groq’s gpt-oss-120b delivers high-throughput inference with competitive performance.
* **More choice:** Select the LLM that fits your performance, cost, and capability needs.

## Why it matters

Voice AI Agents succeed or fail on speed. By optimizing GPT-5 for minimal reasoning effort, we’ve made it viable for real-time interactions without sacrificing conversational quality. And because most voice agent tokens are cached input, GPT-5’s pricing structure offers significant cost advantages. Groq’s gpt-oss-120b brings another competitive option for developers seeking open-source speed and scalability.

## Getting started

It only takes a few minutes to get started.

1. [Sign up](https://telnyx.com/sign-up) or [log in](https://portal.telnyx.com/#/login/sign-in) to your Telnyx Mission Control Portal account.
2. Navigate to the AI Assistants section.
3. Create a new AI Agent or edit an existing one.
4. In the “Agent” tab, select your LLM from the dropdown list.
5. Test your agent directly in the AI Assistant Builder.

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

### Ask AI

* [![GPT](https://d2efw2akbx8gaf.cloudfront.net/https://dotcom-payload-assets-prod.s3.us-east-1.amazonaws.com/cms-media/chatgpt_icon-ea55e09d.jpeg?width=92&format=webp)](https://chat.openai.com/?q=What makes Telnyx's global network different, breakdown call quality for normal phone calls and voice AI calls.)
* [![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.)