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GPT-6 Luna vs Muse Spark

GPT-6 Luna and Muse Spark are closely matched at 44.3 and 41.7 on the LLM Stats Score.

OpenAI · Meta · Updated for 2026

Which is better?

GPT-6 Luna and Muse Spark are closely matched on the overall LLM Stats Score at 44.3 and 41.7.

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

Choose GPT-6 Luna

  • your work emphasizes coding and agents — it leads those capability indexes
  • you want the most recent training data — it shipped Sep 2026

Choose Muse Spark

  • you are already invested in the Meta ecosystem

At a glance

The differences that matter most.

GPT-6 Luna
OpenAI
Muse Spark
Meta
Core performance indexes
LLM Stats Score
44.3
#42
41.7
#58
Reasoning
39.8
#61
40.5
#57
Coding
31.1
#49
22.9
#84
Agents
31.5
#33
14.1
#98
Cost, coverage & limits
Benchmark wins
—
—
Input price
$0.10 / M
— / M
Output price
$0.50 / M
— / M
Context window
1,050,000
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
GPT-6 Luna
Muse Spark
Tool use
21.4#52
16.2#87
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

5 reported for GPT-6 Luna · 19 for Muse Spark

No common benchmarks found

GPT-6 Luna and Muse Sparkdon'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-6 Luna specifies input context (1,050,000 tokens). Only GPT-6 Luna specifies output context (128,000 tokens).

OpenAI
GPT-6 Luna
Input1,050,000 tokens
Output128,000 tokens
Meta
Muse Spark
Input- tokens
Output- tokens
Wed Oct 07 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both GPT-6 Luna and Muse Spark support multimodal inputs.

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

GPT-6 Luna

Text
Images
Audio
Video

Muse Spark

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-6 Luna

Proprietary

Closed source

Muse Spark

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-6 Luna was released on 2026-09-22, while Muse Spark was released on 2026-04-08.

GPT-6 Luna is 6 months newer than Muse Spark.

GPT-6 Luna

Sep 22, 2026

2 weeks ago

5mo newer
Muse Spark

Apr 8, 2026

6 months ago

Knowledge Cutoff

When training data ends

GPT-6 Luna has a documented knowledge cutoff of 2026-05-18, while Muse Spark's cutoff date is not specified.

We can confirm GPT-6 Luna's training data extends to 2026-05-18, but cannot make a direct comparison without Muse Spark's cutoff date.

GPT-6 Luna

May 2026

Muse Spark

—

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against GPT-6 Luna and Muse Spark side-by-side, then vote on the output you prefer.

GPT-6 Luna
✓ Preferred
Muse Spark
Open in Playground

FAQ

Common questions about GPT-6 Luna vs Muse Spark.

Which is better, GPT-6 Luna or Muse Spark?

GPT-6 Luna and Muse Spark are closely matched on the LLM Stats Score at 44.3 and 41.7. GPT-6 Luna is made by OpenAI and Muse Spark 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-6 Luna compare to Muse Spark in benchmarks?

GPT-6 Luna scores DeepSWE 1.1: 66.6%, OSWorld 2.0: 52.7%, Agents' Last Exam: 50.9%, FrontierCode 1.1: 42.4%, AutomationBench v1.0.6: 20.7%. Muse Spark scores Tau2 Telecom: 91.5%, GPQA: 89.5%, CharXiv-R: 86.4%, ScreenSpot Pro: 84.1%, IPhO 2025: 82.6%.

What are the context window sizes for GPT-6 Luna and Muse Spark?

GPT-6 Luna supports 1.1M tokens and Muse Spark 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-6 Luna and Muse Spark?

Key differences include LLM Stats Score (44.3 vs 41.7). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-6 Luna and Muse Spark?

GPT-6 Luna is developed by OpenAI and Muse Spark is developed by Meta.

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