Model Comparison

Claude Mythos Preview vs Muse SparkWhich is better in 2026?

Claude Mythos Preview significantly outperforms across most benchmarks.

Verdict: Claude Mythos Preview vs Muse Spark — which is better?

Claude Mythos Preview (by Anthropic) and Muse Spark (by Meta) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

Claude Mythos Preview outperforms in 6 benchmarks (CharXiv-R, GPQA, Humanity's Last Exam, SWE-Bench Pro, SWE-Bench Verified, Terminal-Bench 2.0), while Muse Spark is better at 0 benchmarks. Claude Mythos Preview significantly outperforms across most benchmarks.

Choose Claude Mythos Preview if…

  • you want the strongest raw capability — it leads on 6 of 6 shared benchmarks

Choose Muse Spark if…

  • you are already invested in the Meta ecosystem
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Performance Benchmarks

Comparative analysis across standard metrics

6 benchmarks

Claude Mythos Preview outperforms in 6 benchmarks (CharXiv-R, GPQA, Humanity's Last Exam, SWE-Bench Pro, SWE-Bench Verified, Terminal-Bench 2.0), while Muse Spark is better at 0 benchmarks.

Claude Mythos Preview significantly outperforms across most benchmarks.

Fri Jun 12 2026 • llm-stats.com

Arena Performance

Human preference votes

Input Capabilities

Supported data types and modalities

Both Claude Mythos Preview and Muse Spark support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Claude Mythos Preview

Text
Images
Audio
Video

Muse Spark

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Claude Mythos Preview

Proprietary

Closed source

Muse Spark

Proprietary

Closed source

Release Timeline

When each model was launched

Muse Spark was released on 2026-04-08, while Claude Mythos Preview's release date is not specified.

We can confirm Muse Spark's release timeline, but cannot make a direct age comparison without Claude Mythos Preview's release date.

Claude Mythos Preview

—

Muse Spark

Apr 8, 2026

2 months ago

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

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Key Takeaways

Anthropic
Higher CharXiv-R score (93.2% vs 86.4%)
Higher GPQA score (94.6% vs 89.5%)
Higher Humanity's Last Exam score (64.7% vs 58.4%)
Higher SWE-Bench Pro score (77.8% vs 52.4%)
Higher SWE-Bench Verified score (93.9% vs 77.4%)
Higher Terminal-Bench 2.0 score (82.0% vs 59.0%)
Meta

No standout differentiators in the data we have for this pair.

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Mythos Preview
Meta
Muse Spark

FAQ

Common questions about Claude Mythos Preview vs Muse Spark.

Which is better, Claude Mythos Preview or Muse Spark?

Claude Mythos Preview significantly outperforms across most benchmarks. Claude Mythos Preview is made by Anthropic and Muse Spark is made by Meta. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude Mythos Preview compare to Muse Spark in benchmarks?

Claude Mythos Preview scores CyBench: 100.0%, USAMO25: 97.6%, GPQA: 94.6%, SWE-Bench Verified: 93.9%, CharXiv-R: 93.2%. Muse Spark scores Tau2 Telecom: 91.5%, GPQA: 89.5%, CharXiv-R: 86.4%, ScreenSpot Pro: 84.1%, IPhO 2025: 82.6%.

Who makes Claude Mythos Preview and Muse Spark?

Claude Mythos Preview is developed by Anthropic and Muse Spark is developed by Meta.

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