Model Comparison

Claude Opus 4.5 vs Muse SparkWhich is better in 2026?

Claude Opus 4.5 has a slight edge in benchmark performance.

Verdict: Claude Opus 4.5 vs Muse Spark — which is better?

Claude Opus 4.5 (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 Opus 4.5 outperforms in 3 benchmarks (SWE-Bench Verified, Tau2 Telecom, Terminal-Bench 2.0), while Muse Spark is better at 2 benchmarks (ARC-AGI v2, GPQA). Claude Opus 4.5 has a slight edge in benchmark performance.

Choose Claude Opus 4.5 if…

  • you want the strongest raw capability — it leads on 3 of 5 shared benchmarks

Choose Muse Spark if…

  • you want the most recent training data — it shipped Apr 2026
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Performance Benchmarks

Comparative analysis across standard metrics

5 benchmarks

Claude Opus 4.5 outperforms in 3 benchmarks (SWE-Bench Verified, Tau2 Telecom, Terminal-Bench 2.0), while Muse Spark is better at 2 benchmarks (ARC-AGI v2, GPQA).

Claude Opus 4.5 has a slight edge in benchmark performance.

Fri Jun 12 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only Claude Opus 4.5 specifies input context (200,000 tokens). Only Claude Opus 4.5 specifies output context (64,000 tokens).

Anthropic
Claude Opus 4.5
Input200,000 tokens
Output64,000 tokens
Meta
Muse Spark
Input- tokens
Output- tokens
Fri Jun 12 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Opus 4.5 and Muse Spark support multimodal inputs.

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

Claude Opus 4.5

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 Opus 4.5

Proprietary

Closed source

Muse Spark

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 4.5 was released on 2025-11-24, while Muse Spark was released on 2026-04-08.

Muse Spark is 5 months newer than Claude Opus 4.5.

Claude Opus 4.5

Nov 24, 2025

6 months ago

Muse Spark

Apr 8, 2026

2 months ago

4mo newer

Knowledge Cutoff

When training data ends

Claude Opus 4.5 has a documented knowledge cutoff of 2025-03-31, while Muse Spark's cutoff date is not specified.

We can confirm Claude Opus 4.5's training data extends to 2025-03-31, but cannot make a direct comparison without Muse Spark's cutoff date.

Claude Opus 4.5

Mar 2025

Muse Spark

—

Outputs Comparison

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Key Takeaways

Anthropic
Larger context window (200,000 tokens)
Higher SWE-Bench Verified score (80.9% vs 77.4%)
Higher Tau2 Telecom score (98.2% vs 91.5%)
Higher Terminal-Bench 2.0 score (59.3% vs 59.0%)
Meta
Higher ARC-AGI v2 score (42.5% vs 37.6%)
Higher GPQA score (89.5% vs 87.0%)

Detailed Comparison

AI Model Comparison Table
Feature
Anthropic
Claude Opus 4.5
Meta
Muse Spark

FAQ

Common questions about Claude Opus 4.5 vs Muse Spark.

Which is better, Claude Opus 4.5 or Muse Spark?

Claude Opus 4.5 has a slight edge in benchmark performance. Claude Opus 4.5 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 Opus 4.5 compare to Muse Spark in benchmarks?

Claude Opus 4.5 scores Tau2 Telecom: 98.2%, MMMLU: 90.8%, Tau2 Retail: 88.9%, GPQA: 87.0%, SWE-Bench Verified: 80.9%. Muse Spark scores Tau2 Telecom: 91.5%, GPQA: 89.5%, CharXiv-R: 86.4%, ScreenSpot Pro: 84.1%, IPhO 2025: 82.6%.

What are the context window sizes for Claude Opus 4.5 and Muse Spark?

Claude Opus 4.5 supports 200K tokens and Muse Spark supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Who makes Claude Opus 4.5 and Muse Spark?

Claude Opus 4.5 is developed by Anthropic and Muse Spark is developed by Meta.

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