Model by OpenAI

gpt-oss-120b

Open-weights model from OpenAI. 131,072-token context. Listed at $0.15 in and $0.6 out per 1M tokens on OpenRouter (2026-10-31).

Checked 2026-10-31

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gpt-oss-120b is OpenAI's open-weights model under Apache 2.0, a standard permissive licence, with a context of about 131,072 tokens. Our gpt-oss page notes that it runs on one 80 GB GPU in MXFP4 and uses the harmony prompt format. OpenRouter lists $0.15 per million input tokens and $0.6 output, and Groq, Together AI and Fireworks each list it at $0.15 and $0.60 on our provider pages, so hosts agree closely on price. We would suggest it for teams that want an open model from a major lab, to self-host or to call at a low price, with speed on Groq as a draw. The limit is that it is older than the GPT-6 line, and that the hardware to run it yourself is not small. We have not tested it ourselves. Prices and specifications come from the OpenRouter listing we checked on 31 October 2026, and we have not tested the model ourselves.

Mentioned here

  • Gemma 4 31B

    Gemma 4 31B is Google's open model, released 2026-04-02 under Apache 2.0, a standard permissive licence.

    • Open weights

    Google · 262K context · $0.20 in / 1M

  • Mistral Large 4

    Mistral Large 4 is Mistral's flagship open-weights model, released 2026-10-06, and OpenRouter lists it at $0.7 per million input tokens and $2.1 output with a 1,048,576-token context and text and image input.

    • Open weights

    Mistral AI · 1M context · $0.70 in / 1M

  • DeepSeek V4 Pro 0813

    DeepSeek V4 Pro 0813 is an open-weights DeepSeek model released 2026-08-12.

    • Open weights

    DeepSeek · 1M context · $0.66 in / 1M

  • Together AI

    Together AI serves open models by the token and also rents GPUs.

    • Model / inference API
    • OpenAI compatible

  • Fireworks AI

    Fireworks AI serves open models by the token and states zero data retention by default.

    • Model / inference API
    • OpenAI compatible

  • Groq

    GroqCloud serves open models on its own inference hardware, with speed as the draw.

    • Model / inference API
    • OpenAI compatible

  • OpenRouter

    OpenRouter routes more than 600 models through one API key.

    • Model gateway (router)
    • OpenAI compatible

Questions

What is the context window of gpt-oss-120b?

131,072 tokens, with up to 65,536 tokens of output.

How much does gpt-oss-120b cost?

$0.15 per million input tokens and $0.6 per million output tokens, checked 31 October 2026.

Can I run gpt-oss-120b on my own hardware?

Yes, the weights are published under the Apache 2.0 licence. They are on huggingface.co.

Who makes gpt-oss-120b?

OpenAI makes it, and released it on 5 August 2025.

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