Model Comparison

Muse Spark 1.1 vs GPT-5.6 LunaWhich is better in 2026?

GPT-5.6 Luna shows notably better performance in the majority of benchmarks.

Verdict: Muse Spark 1.1 vs GPT-5.6 Luna — which is better?

Muse Spark 1.1 (by Meta) and GPT-5.6 Luna (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 (Toolathlon), while GPT-5.6 Luna is better at 2 benchmarks (SWE-Bench Pro, Terminal-Bench 2.1). GPT-5.6 Luna shows notably better performance in the majority of benchmarks.

Choose Muse Spark 1.1 if…

  • you are already invested in the Meta ecosystem

Choose GPT-5.6 Luna if…

  • you want the strongest raw capability — it leads on 2 of 3 shared benchmarks

Performance Benchmarks

Comparative analysis across standard metrics

3 benchmarks

Muse Spark 1.1 outperforms in 1 benchmarks (Toolathlon), while GPT-5.6 Luna is better at 2 benchmarks (SWE-Bench Pro, Terminal-Bench 2.1).

GPT-5.6 Luna shows notably better performance in the majority of benchmarks.

Fri Jul 17 2026 • llm-stats.com

Arena Performance

Human preference votes

Context Window

Maximum input and output token capacity

Only GPT-5.6 Luna specifies input context (1,050,000 tokens). Only GPT-5.6 Luna specifies output context (128,000 tokens).

Meta
Muse Spark 1.1
Input- tokens
Output- tokens
OpenAI
GPT-5.6 Luna
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-5.6 Luna 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-5.6 Luna

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-5.6 Luna

Proprietary

Closed source

Release Timeline

When each model was launched

Both models were released on 2026-07-09.

They likely represent similar generations of model development.

Muse Spark 1.1

Jul 9, 2026

1 weeks ago

GPT-5.6 Luna

Jul 9, 2026

1 weeks ago

Knowledge Cutoff

When training data ends

GPT-5.6 Luna has a documented knowledge cutoff of 2026-02-16, while Muse Spark 1.1's cutoff date is not specified.

We can confirm GPT-5.6 Luna's training data extends to 2026-02-16, but cannot make a direct comparison without Muse Spark 1.1's cutoff date.

Muse Spark 1.1

—

GPT-5.6 Luna

Feb 2026

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Meta
Higher Toolathlon score (75.6% vs 53.4%)
OpenAI
Larger context window (1,050,000 tokens)
Higher SWE-Bench Pro score (62.7% vs 61.5%)
Higher Terminal-Bench 2.1 score (84.7% vs 80.0%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Muse Spark 1.1 and GPT-5.6 Luna side-by-side, then vote on the output you prefer.

Muse Spark 1.1
✓ Preferred
GPT-5.6 Luna
Open in Playground
AI Model Comparison Table
Feature
Meta
Muse Spark 1.1
OpenAI
GPT-5.6 Luna

FAQ

Common questions about Muse Spark 1.1 vs GPT-5.6 Luna.

Which is better, Muse Spark 1.1 or GPT-5.6 Luna?

GPT-5.6 Luna shows notably better performance in the majority of benchmarks. Muse Spark 1.1 is made by Meta and GPT-5.6 Luna 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-5.6 Luna 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-5.6 Luna scores Connectors: 99.9%, HealthBench Consensus: 95.1%, GPQA: 92.3%, Search and Function-Calling: 89.7%, Capture-the-Flag Challenges (Internal): 85.2%.

What are the context window sizes for Muse Spark 1.1 and GPT-5.6 Luna?

Muse Spark 1.1 supports an unknown number of tokens and GPT-5.6 Luna 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-5.6 Luna?

Muse Spark 1.1 is developed by Meta and GPT-5.6 Luna is developed by OpenAI.

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