Grok-4.20 Beta Reasoning vs Muse Spark Open
Muse Spark Open leads the LLM Stats Score 45.3 to 23.4. Muse Spark Open is 1.5x cheaper per token.
xAI · Meta · Updated for 2026
Which is better?
Muse Spark Open leads the overall LLM Stats Score 45.3 to 23.4, ranking #42 overall.
On price, Muse Spark Open is roughly 1.5x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Grok-4.20 Beta Reasoning also accepts a larger context window (2,000,000 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 Grok-4.20 Beta Reasoning
- you process long inputs — it offers a 2,000,000 token context window
Choose Muse Spark Open
- overall performance matters — it scores 45.3 and ranks #42 on LLM Stats
- your work emphasizes reasoning and agents — it leads those capability indexes
- cost matters — it's about 1.5x cheaper per token
- you want the most recent training data — it shipped Oct 2026
- you need open weights you can self-host or fine-tune
At a glance
The differences that matter most.
Individual benchmarks
1 reported for Grok-4.20 Beta Reasoning · 17 for Muse Spark Open
Grok-4.20 Beta Reasoning and Muse Spark Opendon'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, Grok-4.20 Beta Reasoning ($2.00/1M tokens) is 1.6x more expensive than Muse Spark Open ($1.25/1M tokens).
For output processing, Grok-4.20 Beta Reasoning ($6.00/1M tokens) is 1.4x more expensive than Muse Spark Open ($4.25/1M tokens).
In conclusion, Grok-4.20 Beta Reasoning 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
Grok-4.20 Beta Reasoning accepts 2,000,000 input tokens compared to Muse Spark Open's 1,048,576 tokens. Muse Spark Open can generate longer responses up to 1,048,576 tokens, while Grok-4.20 Beta Reasoning is limited to 30,000 tokens.
Input capabilities
Documented input modalities across available providers
Both Grok-4.20 Beta Reasoning and Muse Spark Open support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Grok-4.20 Beta Reasoning
Muse Spark Open
License
Usage and distribution terms
Grok-4.20 Beta Reasoning is licensed under a proprietary license, while Muse Spark Open uses Muse Model License.
License differences may affect how you can use these models in commercial or open-source projects.
Proprietary
Closed source
Muse Model License
Open weights
Release Timeline
When each model was launched
Grok-4.20 Beta Reasoning was released on 2026-03-09, while Muse Spark Open was released on 2026-10-15.
Muse Spark Open is 7 months newer than Grok-4.20 Beta Reasoning.
Mar 9, 2026
7 months ago
Oct 15, 2026
1 weeks ago
7mo newerKnowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Grok-4.20 Beta Reasoning is available from xAI. Muse Spark Open is available from Together.
Grok-4.20 Beta Reasoning
Muse Spark Open
Outputs Comparison
Judge for yourself.
Run your own prompts against Grok-4.20 Beta Reasoning and Muse Spark Open side-by-side, then vote on the output you prefer.
FAQ
Common questions about Grok-4.20 Beta Reasoning vs Muse Spark Open.