Model Comparison

Claude Opus 4.5 vs Muse Spark 1.1Which is better in 2026?

Muse Spark 1.1 significantly outperforms across most benchmarks.

Verdict: Claude Opus 4.5 vs Muse Spark 1.1 — which is better?

Claude Opus 4.5 (by Anthropic) and Muse Spark 1.1 (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 0 benchmarks, while Muse Spark 1.1 is better at 1 benchmark (MCP Atlas). Muse Spark 1.1 significantly outperforms across most benchmarks.

Choose Claude Opus 4.5 if…

  • you want predictable pricing at $5.00/M input and $25.00/M output

Choose Muse Spark 1.1 if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
  • you want the most recent training data — it shipped Jul 2026

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Claude Opus 4.5 outperforms in 0 benchmarks, while Muse Spark 1.1 is better at 1 benchmark (MCP Atlas).

Muse Spark 1.1 significantly outperforms across most benchmarks.

Fri Jul 17 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 1.1
Input- tokens
Output- tokens
Fri Jul 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude Opus 4.5 and Muse Spark 1.1 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 1.1

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 1.1

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Opus 4.5 was released on 2025-11-24, while Muse Spark 1.1 was released on 2026-07-09.

Muse Spark 1.1 is 8 months newer than Claude Opus 4.5.

Claude Opus 4.5

Nov 24, 2025

7 months ago

Muse Spark 1.1

Jul 9, 2026

1 weeks ago

7mo newer

Knowledge Cutoff

When training data ends

Claude Opus 4.5 has a documented knowledge cutoff of 2025-03-31, while Muse Spark 1.1'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 1.1's cutoff date.

Claude Opus 4.5

Mar 2025

Muse Spark 1.1

—

Outputs Comparison

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Key Takeaways

Anthropic
Larger context window (200,000 tokens)
Meta
Higher MCP Atlas score (88.1% vs 62.3%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Claude Opus 4.5 and Muse Spark 1.1 side-by-side, then vote on the output you prefer.

Claude Opus 4.5
✓ Preferred
Muse Spark 1.1
Open in Playground
AI Model Comparison Table
Feature
Anthropic
Claude Opus 4.5
Meta
Muse Spark 1.1

FAQ

Common questions about Claude Opus 4.5 vs Muse Spark 1.1.

Which is better, Claude Opus 4.5 or Muse Spark 1.1?

Muse Spark 1.1 significantly outperforms across most benchmarks. Claude Opus 4.5 is made by Anthropic and Muse Spark 1.1 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 1.1 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 1.1 scores CharXiv-R: 88.4%, MCP Atlas: 88.1%, OSWorld-Verified: 80.8%, Terminal-Bench 2.1: 80.0%, BabyVision: 76.3%.

What are the context window sizes for Claude Opus 4.5 and Muse Spark 1.1?

Claude Opus 4.5 supports 200K tokens and Muse Spark 1.1 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 1.1?

Claude Opus 4.5 is developed by Anthropic and Muse Spark 1.1 is developed by Meta.

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