Model Comparison

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

Muse Spark 1.1 significantly outperforms across most benchmarks.

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

Muse Spark 1.1 (by Meta) and GPT-5.5 (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 6 benchmarks (Finance Agent v2, Humanity's Last Exam, MCP Atlas, OSWorld-Verified, SWE-Bench Pro, Toolathlon), while GPT-5.5 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 6 of 6 shared benchmarks
  • you want the most recent training data — it shipped Jul 2026

Choose GPT-5.5 if…

  • you want predictable pricing at $5.00/M input and $30.00/M output

Performance Benchmarks

Comparative analysis across standard metrics

6 benchmarks

Muse Spark 1.1 outperforms in 6 benchmarks (Finance Agent v2, Humanity's Last Exam, MCP Atlas, OSWorld-Verified, SWE-Bench Pro, Toolathlon), while GPT-5.5 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 specifies input context (1,050,000 tokens). Only GPT-5.5 specifies output context (128,000 tokens).

Meta
Muse Spark 1.1
Input- tokens
Output- tokens
OpenAI
GPT-5.5
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 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

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

Proprietary

Closed source

Release Timeline

When each model was launched

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

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

Muse Spark 1.1

Jul 9, 2026

1 weeks ago

2mo newer
GPT-5.5

Apr 23, 2026

2 months ago

Knowledge Cutoff

When training data ends

GPT-5.5 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'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

Dec 2025

Outputs Comparison

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Key Takeaways

Meta
Higher Finance Agent v2 score (57.2% vs 51.8%)
Higher Humanity's Last Exam score (62.1% vs 52.2%)
Higher MCP Atlas score (88.1% vs 75.3%)
Higher OSWorld-Verified score (80.8% vs 78.7%)
Higher SWE-Bench Pro score (61.5% vs 58.6%)
Higher Toolathlon score (75.6% vs 55.6%)
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 side-by-side, then vote on the output you prefer.

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

FAQ

Common questions about Muse Spark 1.1 vs GPT-5.5.

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

Muse Spark 1.1 significantly outperforms across most benchmarks. Muse Spark 1.1 is made by Meta and GPT-5.5 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 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 scores Tau2 Telecom: 98.0%, ARC-AGI: 95.0%, GPQA: 93.6%, ARC-AGI v2: 85.0%, GDPval-MM: 84.9%.

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

Muse Spark 1.1 supports an unknown number of tokens and GPT-5.5 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?

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

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