Model Comparison

Muse Spark 1.1 vs GPT-5.5 ProWhich is better in 2026?

Muse Spark 1.1 significantly outperforms across most benchmarks.

Verdict: Muse Spark 1.1 vs GPT-5.5 Pro — which is better?

Muse Spark 1.1 (by Meta) and GPT-5.5 Pro (by OpenAI) 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.

Muse Spark 1.1 outperforms in 1 benchmarks (Humanity's Last Exam), while GPT-5.5 Pro is better at 0 benchmarks. Muse Spark 1.1 significantly outperforms across most benchmarks.

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

Choose GPT-5.5 Pro if…

  • you want predictable pricing at $30.00/M input and $180.00/M output

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Muse Spark 1.1 outperforms in 1 benchmarks (Humanity's Last Exam), while GPT-5.5 Pro is better at 0 benchmarks.

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 GPT-5.5 Pro specifies input context (1,050,000 tokens). Only GPT-5.5 Pro specifies output context (128,000 tokens).

Meta
Muse Spark 1.1
Input- tokens
Output- tokens
OpenAI
GPT-5.5 Pro
Input1,050,000 tokens
Output128,000 tokens
Fri Jul 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Muse Spark 1.1 and GPT-5.5 Pro support multimodal inputs.

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

Muse Spark 1.1

Text
Images
Audio
Video

GPT-5.5 Pro

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.

Muse Spark 1.1

Proprietary

Closed source

GPT-5.5 Pro

Proprietary

Closed source

Release Timeline

When each model was launched

Muse Spark 1.1 was released on 2026-07-09, while GPT-5.5 Pro was released on 2026-04-23.

Muse Spark 1.1 is 3 months newer than GPT-5.5 Pro.

Muse Spark 1.1

Jul 9, 2026

1 weeks ago

2mo newer
GPT-5.5 Pro

Apr 23, 2026

2 months ago

Knowledge Cutoff

When training data ends

GPT-5.5 Pro has a documented knowledge cutoff of 2025-12-01, while Muse Spark 1.1's cutoff date is not specified.

We can confirm GPT-5.5 Pro's training data extends to 2025-12-01, but cannot make a direct comparison without Muse Spark 1.1's cutoff date.

Muse Spark 1.1

—

GPT-5.5 Pro

Dec 2025

Outputs Comparison

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Key Takeaways

Meta
Higher Humanity's Last Exam score (62.1% vs 57.2%)
OpenAI
Larger context window (1,050,000 tokens)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Muse Spark 1.1 and GPT-5.5 Pro side-by-side, then vote on the output you prefer.

Muse Spark 1.1
✓ Preferred
GPT-5.5 Pro
Open in Playground
AI Model Comparison Table
Feature
Meta
Muse Spark 1.1
OpenAI
GPT-5.5 Pro

FAQ

Common questions about Muse Spark 1.1 vs GPT-5.5 Pro.

Which is better, Muse Spark 1.1 or GPT-5.5 Pro?

Muse Spark 1.1 significantly outperforms across most benchmarks. Muse Spark 1.1 is made by Meta and GPT-5.5 Pro is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Muse Spark 1.1 compare to GPT-5.5 Pro in benchmarks?

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%. GPT-5.5 Pro scores BrowseComp: 90.1%, GDPval-MM: 82.3%, Humanity's Last Exam: 57.2%, FrontierMath: 39.6%, GeneBench: 33.2%.

What are the context window sizes for Muse Spark 1.1 and GPT-5.5 Pro?

Muse Spark 1.1 supports an unknown number of tokens and GPT-5.5 Pro supports 1.1M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

Who makes Muse Spark 1.1 and GPT-5.5 Pro?

Muse Spark 1.1 is developed by Meta and GPT-5.5 Pro is developed by OpenAI.

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