Model vs model
GPT OSS 120B vs Muse Ember
At a glance
Longer bar means the bigger number.
Open or closed · can you download the model and run it yourself?
Context window · tokens it can read at once
Where they sit among all 45 models
GPT OSS 120B ranks 36th of the 40 models with an Intelligence Index. Up and to the left is smarter for less money. Hover or tap a dot for its numbers, then click it to compare that model with GPT OSS 120B.
Which one to pick
Pick GPT OSS 120B if
- you want open weights you can download and run yourself
Pick Muse Ember if
- you need a longer context window (1.05M vs 131K tokens)
- you need to send images and PDFs
How smart is each one?
Every intelligence score we have
Out of 100, higher is better. GPT OSS 120B Muse Ember
Muse Ember has no Artificial Analysis scores yet, so only our own tests compare them.
Overall
Intelligence Index
11.6
By area
Coding
30.4Math
93.4Agentic work
3.7
By field of work
Finance & accounting
12.2Legal
11.3Healthcare & medicine
10.8Economics
18.3Engineering
15.1Strategy & operations
7.9
Benchmarks
Hard reasoning · Humanity's Last Exam
19.6Science · GPQA Diamond
78.2Competition math · OTIS Mock AIME
88.9Knowledge · MMLU-Pro
80.8Competitive coding · LiveCodeBench
87.8Scientific coding · SciCode
34Terminal tasks · Terminal-Bench 4.0
0Tool use · τ-Bench Banking
12.8Instruction following · IFBench
69Long documents · AA-LCR
52Competition math · AIME 2025
93.4Uncensored · UGI
19.7
The specs
| Spec | GPT OSS 120B | Muse Ember |
|---|---|---|
| Input price | $0.10 per 1M | $0.10 per 1M |
| Output price | $0.50 per 1M | $0.50 per 1M |
| Cost per test task | $0.1076 | Not tested |
| Context window | 131K | 1.05M |
| Max output | 131K | — |
| Accepts | Text | Text, Image, PDF |
| Open weights | Yes | No |
| Lab | OpenAI | Meta |
| Released | Aug 2025 | Nov 2026 |
| Knowledge cutoff | Jun 2024 | Not published |
Blended price weighs 3 parts input to 1 part output. List prices from models.dev. Cost per test task from Artificial Analysis.
Questions
Is GPT OSS 120B or Muse Ember cheaper?
They cost the same, $0.20 per 1M tokens blended.
Are GPT OSS 120B and Muse Ember open source?
Only GPT OSS 120B. It is an open-weights model: OpenAI publishes the weights, so you can download it, run it on your own hardware or pick any host. Muse Ember is closed: you can only use it through an API.
Which has the longer context window?
Muse Ember accepts 1.05M tokens, against 131K for GPT OSS 120B.
Can I compare GPT OSS 120B and Muse Ember on my own prompt?
Yes. ModelCompare sends one prompt to both models at once and shows each answer side by side with what it cost. You can try it free without an account.
Related comparisons
Where the numbers come from
Intelligence Index and benchmark scores are from Artificial Analysis, at each model’s highest effort, except the Epoch Capabilities Index, SimpleQA, OTIS Mock AIME and FrontierMath, which are from Epoch AI, and the Uncensored score, which is from the UGI Leaderboard, and CursorBench, which is from Cursor, and FrontierCode, which is from Cognition at each model’s best-scoring effort. The hallucination test is ours: questions with one exact answer, fake evidence pushed against right answers and requests that tempt a model to name packages that don’t exist. Prices are list prices from models.dev. Example answers come from our own test runs. Updated November 13, 2026.