Muse Spark Open vs o3-pro
Comparing Muse Spark Open and o3-pro across benchmarks, pricing, and capabilities.
Meta · OpenAI · Updated for 2026
Which is better?
Muse Spark Open and o3-pro trade strengths across price, capabilities, and technical limits. The better choice depends on the workload.
On price, Muse Spark Open is roughly 17.5x 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 Muse Spark Open
- cost matters — it's about 17.5x cheaper per token
- you process long inputs — it offers a 1,048,576 token context window
- you want the most recent training data — it shipped Oct 2026
- you need open weights you can self-host or fine-tune
Choose o3-pro
- you want predictable pricing at $20.00/M input and $80.00/M output
At a glance
The differences that matter most.
Individual benchmarks
17 reported for Muse Spark Open · 0 for o3-pro
Muse Spark Open and o3-prodon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Muse Spark Open ($1.25/1M tokens) is 16.0x cheaper than o3-pro ($20.00/1M tokens).
For output processing, Muse Spark Open ($4.25/1M tokens) is 18.8x cheaper than o3-pro ($80.00/1M tokens).
In conclusion, o3-pro is more expensive than Muse Spark Open.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Muse Spark Open accepts 1,048,576 input tokens compared to o3-pro's 200,000 tokens. Muse Spark Open can generate longer responses up to 1,048,576 tokens, while o3-pro is limited to 100,000 tokens.
Input capabilities
Documented input modalities across available providers
Both Muse Spark Open and o3-pro support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Muse Spark Open
o3-pro
License
Usage and distribution terms
Muse Spark Open is licensed under Muse Model License, while o3-pro uses a proprietary license.
License differences may affect how you can use these models in commercial or open-source projects.
Muse Model License
Open weights
Proprietary
Closed source
Release Timeline
When each model was launched
Muse Spark Open was released on 2026-10-15, while o3-pro was released on 2025-06-10.
Muse Spark Open is 16 months newer than o3-pro.
Oct 15, 2026
1 weeks ago
1.3yr newerJun 10, 2025
1.4 years ago
Knowledge Cutoff
When training data ends
o3-pro has a documented knowledge cutoff of 2024-05-31, while Muse Spark Open's cutoff date is not specified.
We can confirm o3-pro's training data extends to 2024-05-31, but cannot make a direct comparison without Muse Spark Open's cutoff date.
—
May 2024
Provider Availability
Muse Spark Open is available from Together. o3-pro is available from OpenAI.
Muse Spark Open
o3-pro
Outputs Comparison
Judge for yourself.
Run your own prompts against Muse Spark Open and o3-pro side-by-side, then vote on the output you prefer.
FAQ
Common questions about Muse Spark Open vs o3-pro.