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GPT-5.5 Pro vs Muse Wonder

GPT-5.5 Pro and Muse Wonder are closely matched at 45.9 and 49.3 on the LLM Stats Score.

OpenAI · Meta · Updated for 2026

Which is better?

GPT-5.5 Pro and Muse Wonder are closely matched on the overall LLM Stats Score at 45.9 and 49.3.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose GPT-5.5 Pro

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

Choose Muse Wonder

  • you want the most recent training data — it shipped Oct 2026

At a glance

The differences that matter most.

GPT-5.5 Pro
OpenAI
Muse Wonder
Meta
Core performance indexes
LLM Stats Score
45.9
#38
49.3
#24
Reasoning
45.9
#34
37.8
#82
Agents
31.1
#41
37.2
#17
Cost, coverage & limits
Benchmark wins
—
—
Input price
$30.00 / M
— / M
Output price
$180.00 / M
— / M
Context window
1,050,000
—

Individual benchmarks

5 reported for GPT-5.5 Pro · 16 for Muse Wonder

No common benchmarks found

GPT-5.5 Pro and Muse Wonderdon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Human preference

Blind head-to-head votes and playground preference scores

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).

OpenAI
GPT-5.5 Pro
Input1,050,000 tokens
Output128,000 tokens
Meta
Muse Wonder
Input- tokens
Output- tokens
Sat Oct 24 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both GPT-5.5 Pro and Muse Wonder support multimodal inputs.

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

GPT-5.5 Pro

Text
Images
Audio
Video

Muse Wonder

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.

GPT-5.5 Pro

Proprietary

Closed source

Muse Wonder

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-5.5 Pro was released on 2026-04-23, while Muse Wonder was released on 2026-10-12.

Muse Wonder is 6 months newer than GPT-5.5 Pro.

GPT-5.5 Pro

Apr 23, 2026

6 months ago

Muse Wonder

Oct 12, 2026

1 weeks ago

5mo newer

Knowledge Cutoff

When training data ends

GPT-5.5 Pro has a documented knowledge cutoff of 2025-12-01, while Muse Wonder'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 Wonder's cutoff date.

GPT-5.5 Pro

Dec 2025

Muse Wonder

—

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

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

GPT-5.5 Pro
✓ Preferred
Muse Wonder
Open in Playground

FAQ

Common questions about GPT-5.5 Pro vs Muse Wonder.

Which is better, GPT-5.5 Pro or Muse Wonder?

GPT-5.5 Pro and Muse Wonder are closely matched on the LLM Stats Score at 45.9 and 49.3. GPT-5.5 Pro is made by OpenAI and Muse Wonder is made by Meta. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

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

GPT-5.5 Pro scores BrowseComp: 90.1%, GDPval-MM: 82.3%, Humanity's Last Exam: 57.2%, FrontierMath: 39.6%, GeneBench: 33.2%. Muse Wonder scores MemoryBench: 85.6%, DeepSWE 1.1: 78.8%, OSWorld 2.1 (partial): 72.6%, JobBench: 70.5%, HealthBench Professional: 60.5%.

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

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

What are the main differences between GPT-5.5 Pro and Muse Wonder?

Key differences include LLM Stats Score (45.9 vs 49.3). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-5.5 Pro and Muse Wonder?

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

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