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

> Source: <https://telnyx.com/release-notes/gpt-oss-120b>
> Published: 2026-10-30 00:00:00+00:00

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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.

`model=openai/gpt-oss-120b` in the 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.

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.

```
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."}
    ]
  }'
```

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