How much does gpt-oss-120b cost?

gpt-oss-120b costs $0.15 per million input tokens and $0.60 per million output tokens, using the median price across hosting providers as of 26 Oct 2026. That is about $0.04 for 100 chats of about 1,000 tokens in and 500 tokens back. Confirm on the maker's site before you buy, because prices change.

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

gpt-oss-120b has a context window of 131K tokens, roughly 98,000 words of text read at once. A single answer can be up to 131K tokens long.

Is gpt-oss-120b open source?

gpt-oss-120b has open weights: its trained parameters can be downloaded. That is not always the same as open source, because licence terms differ, so read the licence before you use it commercially.

How good is gpt-oss-120b compared with other AI models?

On the Epoch Capabilities Index, gpt-oss-120b scores 139.8 (likely range 135.6 to 142.1), which ranks 123 of 270 models we track. On Arena's human-vote text board it is ranked 122 of 166. Scores close together are a tie in practice.

How does gpt-oss-120b compare with DeepSeek-V3.1?

DeepSeek-V3.1 scores higher on 3 of 4 shared quality measures, gpt-oss-120b on 0. 1 measure is too close to call. gpt-oss-120b costs about 69% less than DeepSeek-V3.1 on a blended price of $0.26 against $0.84 per million tokens. See the full comparison for every measure.

How current are these numbers for gpt-oss-120b?

The newest data on this page is dated 26 Oct 2026. Scores come from Epoch AI and Arena, prices from the open LiteLLM price list.

AI Rankings

gpt-oss-120b: Score, Price and Context Window

Where gpt-oss-120b from OpenAI ranks, what it costs and how much text it can read, in plain numbers with the sources.

Data updated 26 Oct 2026

OpenAI
Open weights
Released Aug 2025

Its score range overlaps with Gemini 2.5 Flash (Apr 2025), the model just above it, so a small gap in rank is not a meaningful difference.

Best for

Keeping costs low: it is among the cheapest quarter of models in the top half by score.
Running it yourself: its weights can be downloaded (read the licence terms first).

These lines are worked out from the numbers on this page, not from hands-on testing.

Key facts

Overall score: 139.8; Rank 123 of 270. Likely range 135.6 to 142.1.
Human preference: chat: 1352; Rank 122 of 166. 30,207 votes.
Human preference: coding: 1389; Rank 122 of 166. 6,410 votes.
Price per million tokens: $0.15 in / $0.60 out; Blended $0.26. Cached input $0.03. Median across hosting providers, checked 26 Oct 2026.
Context window: 131K tokens; About 98,000 words at once. One answer up to 131K tokens.
Weights: Open; The weights can be downloaded. Check the licence before commercial use.

Features listed by the price list: Tool use, Structured output, Reasoning.

Try itChatGPT in our AI tools directoryOpenAI's AI assistant for writing, coding, research, file analysis, and connected work across chats and projects.

How gpt-oss-120b stacks up

Each strip shows every model we track as faint bars. The dot is this model. Better is always to the right, even for price.

gpt-oss-120b compared with all models we trackOverall capability: 139.8. Better than 54% of the other 269 models. Human preference: chat: 1352. Better than 26% of the other 165 models. Human preference: coding: 1389. Better than 26% of the other 165 models. Price: $0.26 per 1M. Cheaper than 77% of the other 200 priced models. Context window: 131K tokens. Larger context window than 28% of the other 198 models.

Overall capability139.8
Better than 54% of the other 269 modelsUpper half
Epoch Capabilities Index: one score that combines many tests.
Human preference: chat1352
Better than 26% of the other 165 models
How often people pick its answers over another model's on Arena.
Human preference: coding1389
Better than 26% of the other 165 models
How often people pick its answers to coding questions on Arena.
Price$0.26 per 1M
Cheaper than 77% of the other 200 priced modelsTop 25%
Blended price per million tokens. Lower is better, so the cheapest models sit on the right.
Context window131K tokens
Larger context window than 28% of the other 198 models
How much text it can read at once. Bigger suits long documents.

Compared with the other published models that have each measure. Data updated 26 Oct 2026.

Where gpt-oss-120b ranks

Leaderboards it appears on, best placing first.

See all leaderboards

Test results

Each test checks one kind of skill. Place shows where it stands among the models that took that test.

OTIS Mock AIME
Maths competition problems in the style of the US AIME exam, from the 2024 and 2025 sets. Every answer is a whole number.
88.9%
Place 60 of 174
tied with 3 others
GPQA Diamond
Very hard multiple-choice science questions in biology, physics and chemistry, written by experts and designed so a quick web search does not give the answer.
75.8%
Place 97 of 183
tied with 2 others
Aider Polyglot
225 coding exercises in six programming languages. The AI edits the code files and the exercise's tests decide pass or fail.
41.8%
Place 30 of 46
Terminal-Bench
Tasks done in a computer terminal, such as setting up software or fixing a broken build, checked by automatic tests. Scores here use the benchmark's standard reference agent so models are compared on the same footing.
18.7%
Place 22 of 25
SimpleBench
Everyday common-sense and trick questions that most people answer correctly but AI models often get wrong.
22.1%
Place 74 of 80

What it costs in everyday terms

List prices turned into amounts you can picture. Real bills depend on how you use it.

100 chats: $0.04; Cost of 100 chats assumes each chat sends 1,000 tokens (about 750 words) and gets 500 tokens (about 375 words) back.
A 300-page book: $0.01; Cost to read a 300-page book assumes about 100,000 input tokens and no reply. A real book varies with page size and language.
Blended price: $0.26 per 1M; Three parts input to one part output. Our own calculation for comparing models.

Similar models

Models from other makers with a similar overall score.

Learn more

Questions about gpt-oss-120b

How much does gpt-oss-120b cost?: gpt-oss-120b costs $0.15 per million input tokens and $0.60 per million output tokens, using the median price across hosting providers as of 26 Oct 2026. That is about $0.04 for 100 chats of about 1,000 tokens in and 500 tokens back. Confirm on the maker's site before you buy, because prices change.
What is the context window of gpt-oss-120b?: gpt-oss-120b has a context window of 131K tokens, roughly 98,000 words of text read at once. A single answer can be up to 131K tokens long.
Is gpt-oss-120b open source?: gpt-oss-120b has open weights: its trained parameters can be downloaded. That is not always the same as open source, because licence terms differ, so read the licence before you use it commercially.
How good is gpt-oss-120b compared with other AI models?: On the Epoch Capabilities Index, gpt-oss-120b scores 139.8 (likely range 135.6 to 142.1), which ranks 123 of 270 models we track. On Arena's human-vote text board it is ranked 122 of 166. Scores close together are a tie in practice.
How does gpt-oss-120b compare with DeepSeek-V3.1?: DeepSeek-V3.1 scores higher on 3 of 4 shared quality measures, gpt-oss-120b on 0. 1 measure is too close to call. gpt-oss-120b costs about 69% less than DeepSeek-V3.1 on a blended price of $0.26 against $0.84 per million tokens. See the full comparison for every measure.
How current are these numbers for gpt-oss-120b?: The newest data on this page is dated 26 Oct 2026. Scores come from Epoch AI and Arena, prices from the open LiteLLM price list.

Where this data comes from

Epoch AI: Benchmark data: Epoch AI, 'Capabilities & benchmarking', epoch.ai/benchmarks (CC BY 4.0). We match models across sources, rank them and show them in charts. Scores are not changed. Epoch AI does not endorse this site.
Arena (formerly LMArena): Human-preference ratings: Arena (arena.ai) leaderboard dataset, CC BY 4.0. We keep the latest published ratings, match them to models from other sources and rank them. Ratings are not changed. Arena does not endorse this site.
LiteLLM model price list: Prices and context windows: LiteLLM model price list (github.com/BerriAI/litellm, MIT licence). We use the model maker's own price entry when there is one. Prices change often, so always confirm on the maker's site before you buy.

Newest data on this page: 26 Oct 2026. Prices are list prices and change often, so confirm on the maker's site before you buy. Sponsors never change a score or an order. How we calculate this · Report a mistake