GPT OSS 120B vs Muse Spark Open
Muse Spark Open leads the LLM Stats Score 45.3 to 28.1. GPT OSS 120B is 28.5x cheaper per token.
OpenAI · Meta · Updated for 2026
Which is better?
Muse Spark Open leads the overall LLM Stats Score 45.3 to 28.1, ranking #42 overall.
In the 1 individual benchmarks reported for both models, Muse Spark Open wins 1; this is a narrower head-to-head signal than the composite indexes.
On price, GPT OSS 120B is roughly 28.5x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Muse Spark Open also accepts a larger context window (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose GPT OSS 120B
- cost matters — it's about 28.5x cheaper per token
Choose Muse Spark Open
- overall performance matters — it scores 45.3 and ranks #42 on LLM Stats
- your work emphasizes reasoning — it leads those capability indexes
- you value its reported benchmark strengths — it wins 1 of 1 exact shared results
- you process long inputs — it offers a 1,048,576 token context window
- you want the most recent training data — it shipped Oct 2026
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
7 reported for GPT OSS 120B · 17 for Muse Spark Open
GPT OSS 120B outperforms in 0 benchmarks, while Muse Spark Open is better at 1 benchmark (GPQA).
Muse Spark Open significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, GPT OSS 120B ($0.04/1M tokens) is 33.8x cheaper than Muse Spark Open ($1.25/1M tokens).
For output processing, GPT OSS 120B ($0.17/1M tokens) is 25.0x cheaper than Muse Spark Open ($4.25/1M tokens).
In conclusion, Muse Spark Open is more expensive than GPT OSS 120B.*
* Using a 3:1 ratio of input to output tokens
Model Size
Parameter count comparison
Muse Spark Open has 699.2B more parameters than GPT OSS 120B, making it 598.6% larger.
Context Window
Maximum input and output token capacity
Muse Spark Open accepts 1,048,576 input tokens compared to GPT OSS 120B's 131,072 tokens. Muse Spark Open can generate longer responses up to 1,048,576 tokens, while GPT OSS 120B is limited to 131,072 tokens.
Input capabilities
Documented input modalities across available providers
Muse Spark Open supports multimodal inputs, whereas GPT OSS 120B does not.
Muse Spark Open can handle both text and other forms of data like images, making it suitable for multimodal applications.
GPT OSS 120B
Muse Spark Open
License
Usage and distribution terms
GPT OSS 120B is licensed under Apache 2.0, while Muse Spark Open uses Muse Model License.
License differences may affect how you can use these models in commercial or open-source projects.
Apache 2.0
Open weights
Muse Model License
Open weights
Release Timeline
When each model was launched
GPT OSS 120B was released on 2025-08-05, while Muse Spark Open was released on 2026-10-15.
Muse Spark Open is 15 months newer than GPT OSS 120B.
Aug 5, 2025
1.2 years ago
Oct 15, 2026
1 weeks ago
1.2yr newerKnowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
GPT OSS 120B is available from DeepInfra, Novita, OpenAI, Fireworks, Groq. Muse Spark Open is available from Together.
GPT OSS 120B
Muse Spark Open
Outputs Comparison
Judge for yourself.
Run your own prompts against GPT OSS 120B and Muse Spark Open side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT OSS 120B vs Muse Spark Open.