---
title: gpt-oss-120b Now Available on Telnyx Inference
canonical: https://telnyx.com/release-notes/gpt-oss-120b
---
# gpt-oss-120b Now Available on Telnyx Inference

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

# gpt-oss-120b Now Available on Telnyx Inference

### 30, Oct 2026

gpt-oss-120b, an open-weight reasoning model built by OpenAI, is now available on [Telnyx Inference](https://telnyx.com/products/inference) in beta, hosted on Telnyx-owned GPUs in US regions.

### What's new

* **Open-weight reasoning from OpenAI:** Telnyx serves gpt-oss-120b, a 117B mixture-of-experts model, with `model=openai/gpt-oss-120b` in the [Chat Completions API](https://developers.telnyx.com/api-reference/openai-chat/create-a-chat-completion-openai-compatible). It offers a 128K context window and low, medium, and high reasoning effort, and is not currently available in AI Assistants.
* **More open-weight models from US companies:** gpt-oss-120b (OpenAI) and google/gemma-4-26B-A4B-it (Google) are both open-weight releases from US companies. Gemma 4 26B A4B is a lightweight 25.8B-parameter model with a 256K context window, already available on Telnyx Inference.

### Why it matters

OpenAI built gpt-oss-120b in the US and released it as open weights, and Telnyx serves it on Telnyx-owned GPUs inside the United States. Because we own the infrastructure, adding models like this is fast and pricing stays at a fraction of proprietary APIs.

### Example use cases

The model documentation positions gpt-oss-120b for open-weight reasoning. With a 128K context window and configurable reasoning effort, it fits reasoning-heavy workloads like document analysis and agentic planning, and teams already running OpenAI-compatible clients can switch the base URL to Telnyx without changing their code.

### Getting started

1. Call the chat completions endpoint with `model=openai/gpt-oss-120b`:

curl -X POST https://api.telnyx.com/v2/ai/openai/chat/completions \
  -H "Authorization: Bearer $TELNYX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "openai/gpt-oss-120b",
    "messages": [
      {"role": "user", "content": "Prove that the square root of 2 is irrational."}
    ]
  }'

1. List available [models through the model catalog API](https://developers.telnyx.com/api-reference/openai-chat/get-available-models-openai-compatible) to see the hosted lineup.

**Learn more** in the [model documentation](https://developers.telnyx.com/docs/inference/models).

[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.)