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gpt-oss-120b

OpenAI's older downloadable model. Still a cheap, well-known starting point for running your own.

Last updated October 16, 2026.

Costs here use the prices AI companies charge software developers, so they show relative cost, not your monthly bill. See what ChatGPT, Claude and Gemini charge you.

Made by OpenAI, the company behind ChatGPT. Free to download.

What it costs

1,000-word essay: under 1 cent
100 chat messages: $0.19 (about 19 cents)
50-page PDF summary: $0.01 (about 1 cent)

Based on list prices and the assumptions on How we work. Your real cost will differ.

At a glance

Smartness: ★☆☆☆☆ (1 of 5) (our banding of the Artificial Analysis score, where available)
Reads at once: about 200 pages (rule of thumb)
Understands: text
Free to download and run yourself: Yes
Free to use: Not free for developers. Free app plans

App plans and prices for ChatGPT: see plans.

Best for

running it yourselftight budgets

Watch out for

Released August 2025 and well behind current models. Reads fewer pages at once.

Frequently asked

How much does gpt-oss-120b cost to use?
A 1,000-word essay costs about under 1 cent; summarizing a 50-page PDF about $0.01 (about 1 cent). These are developer (API) prices, not an app subscription.

What is gpt-oss-120b best for?
OpenAI's older downloadable model. Still a cheap, well-known starting point for running your own.

How much can gpt-oss-120b read at once?
About 200 pages (a rule of thumb: 131,072 tokens at roughly 500 words a page).

Can I download gpt-oss-120b for free?
Yes, the model files are published, though running a large one needs powerful hardware.

Under the hood

Maker	OpenAI
Price per 1M input tokens	$0.15
Price per 1M output tokens	$0.60
Context size	131K tokens (131,072)
Artificial Analysis Intelligence Index	11.6 (source, via OpenRouter)
Open weights	Yes (Hugging Face: openai/gpt-oss-120b)
Speed	Not measured yet
Listed	2025-08-05

Maker's description (technical)

gpt-oss-120b is an open-weight, 117B-parameter Mixture-of-Experts (MoE) language model from OpenAI designed for high-reasoning, agentic, and general-purpose production use cases. It activates 5.1B parameters per forward pass and is optimized...

View on OpenRouter. Our verdict above is editorial, not benchmarked by us.