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Comparison · 2 models · Updated Oct 4, 2026

GPT-6 Luna vs Muse Spark 1.1

Too close to call on our weighted score (GPT-6 Luna 60, Muse Spark 1.1 57). The right pick depends on what you value most.

  1. OpenAI

    GPT-6 Luna

    Released Sep 22, 2026

    60/100
    • ECI—
    • Price$0.10 / $0.50
    • Context1.05M
    Full specs Remove GPT-6 Luna

  2. Meta

    Muse Spark 1.1

    Released Jul 9, 2026

    57/100
    • ECI154.3
    • Price$1.25 / $4.25
    • Context1.05M
    Full specs Remove Muse Spark 1.1

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01 — Verdict

Too close to call

It is close. Our weighted score puts them within 2 points (GPT-6 Luna 60/100, Muse Spark 1.1 57/100), so choose by what matters most for your work: Muse Spark 1.1 for raw capability and GPT-6 Luna on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%. Capability uses the average of shared benchmarks (SimpleQA Verified), because GPT-6 Luna has no Capabilities Index score yet.

  • CapabilityMuse Spark 1.1Shared benchmarks: Muse Spark 1.1 57.8% · GPT-6 Luna 41.4%
  • Lowest priceGPT-6 LunaGPT-6 Luna $0.20 · Muse Spark 1.1 $2.00 per 1M tokens (3:1 blend)
  • Longest contextAbout the sameGPT-6 Luna 1,050,000 · Muse Spark 1.1 1,048,576 tokens
  • Widest inputsMuse Spark 1.1GPT-6 Luna: Text, Images, PDFs · Muse Spark 1.1: Text, Images, PDFs, Video
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightGPT-6 LunaMuse Spark 1.1
CapabilityShared benchmarks50%4158
Price25%8336
Inputs & features15%8090
Context window10%6161
Overall100%60/10057/100
02 — Side by side

Every spec in one table

Highlighted cells lead their row. Dashes mean the data is not published.

GPT-6 Luna vs Muse Spark 1.1 specifications side by side
SpecificationGPT-6 LunaOpenAIMuse Spark 1.1Meta
Capability
Capabilities Index (ECI)—154.3
ECI rank—#35 of 148
GPQA DiamondGraduate-level science questions90.5%—
FrontierMath Tiers 1–3Research-level mathematics79.0%—
OTIS Mock AIME 2024–2025Competition mathematics98.9%—
SimpleQA VerifiedShort factual questions41.4%57.8% (best)
Price per million tokens
Input$0.10 (best)$1.25
Output$0.50 (best)$4.25
Cached input$0.01 (best)$0.15
Blended (3:1)$0.20 (best)$2.00
Long-context rateOver 272K: $0.20 / $0.75Same rate
Price sourceOfficial OpenAI APIOfficial Meta API
Limits
Context window1,050,000 tokens (best)1,048,576 tokens
Max output128,000 tokens131,072 tokens (best)
Inputs and features
TextYesYes
ImagesYesYes
PDFsYesYes
AudioNoNo
VideoNoYes
ReasoningYeslow · medium · high · xhigh · maxYesminimal · low · medium · high · xhigh
Tool callingYesYes
Structured outputYesYes
Availability
WeightsProprietaryProprietary
API model IDgpt-6-lunamuse-spark-1.1
API providers24 (best)13
ReleasedSep 22, 2026Jul 9, 2026
Knowledge cutoffMay 18, 2026—
03 — Cost

What would a month cost?

Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.

  • GPT-6 Luna$2.00
  • Muse Spark 1.1$21.00
04 — Questions

Which should you choose?

Which is better: GPT-6 Luna or Muse Spark 1.1?

It is close. Our weighted score puts them within 2 points (GPT-6 Luna 60/100, Muse Spark 1.1 57/100), so choose by what matters most for your work: Muse Spark 1.1 for raw capability and GPT-6 Luna on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%. Capability uses the average of shared benchmarks (SimpleQA Verified), because GPT-6 Luna has no Capabilities Index score yet.

Which is cheaper, GPT-6 Luna or Muse Spark 1.1?

GPT-6 Luna is cheaper at $0.10 input / $0.50 output per million tokens (official OpenAI API price). Muse Spark 1.1 costs $1.25 input / $4.25 output per million tokens (official Meta API price). At a typical mix of three input tokens to one output token, that is $0.20 per million tokens for GPT-6 Luna versus $2.00 for Muse Spark 1.1 (10× as much).

Which scores higher on benchmarks?

Not every model here has a Capabilities Index score, so we compare the average of shared benchmarks (SimpleQA Verified): Muse Spark 1.1 57.8% and GPT-6 Luna 41.4%. On individual benchmarks: SimpleQA Verified — Muse Spark 1.1 57.8%, GPT-6 Luna 41.4%.

Which is better for coding?

There are no published SWE-bench Verified results for GPT-6 Luna and Muse Spark 1.1 yet, so there is no like-for-like coding score. On overall capability, Muse Spark 1.1 leads, which tends to carry over to coding, but test on your own codebase. Both support tool calling for agent workflows.

Which has the bigger context window?

Their context windows are effectively the same size: GPT-6 Luna 1,050,000 and Muse Spark 1.1 1,048,576 tokens. Maximum output per response: GPT-6 Luna up to 128,000, Muse Spark 1.1 up to 131,072 tokens.

Which can read images, PDFs, audio or video?

GPT-6 Luna accepts text, images and PDFs; Muse Spark 1.1 accepts text, images, PDFs and video. Muse Spark 1.1 handles the widest range of inputs.

Are any of these open source?

No. GPT-6 Luna and Muse Spark 1.1 are proprietary and only available through APIs and apps.

Which is newer?

GPT-6 Luna is the newest, released Sep 22, 2026. Muse Spark 1.1 came out Jul 9, 2026. Knowledge cutoff: GPT-6 Luna May 18, 2026.

How do you decide the winner?

Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Oct 4, 2026.

05 — Keep comparing

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