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Comparison · 2 models · Updated Nov 2, 2026

GPT-6 Astra vs Muse Spark 1.2

Too close to call on our weighted score (Muse Spark 1.2 71, GPT-6 Astra 68). The right pick depends on what you value most.

  1. OpenAI

    GPT-6 Astra

    Released Sep 4, 2026New

    68/100
    • ECI169.1
    • Price$10.00 / $50.00
    • Context1.05M
    Full specs Remove GPT-6 Astra

  2. Meta

    Muse Spark 1.2

    Released Aug 5, 2026

    71/100
    • ECI155.2
    • Price$1.25 / $4.25
    • Context1.05M
    Full specs Remove Muse Spark 1.2

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01 — Verdict

Too close to call

It is close. Our weighted score puts them within 3 points (Muse Spark 1.2 71/100, GPT-6 Astra 68/100), so choose by what matters most for your work: GPT-6 Astra for raw capability and Muse Spark 1.2 on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityGPT-6 AstraCapabilities Index (ECI): GPT-6 Astra 169.1 · Muse Spark 1.2 155.2
  • Lowest priceMuse Spark 1.2Muse Spark 1.2 $2.00 · GPT-6 Astra $20.00 per 1M tokens (3:1 blend)
  • Longest contextAbout the sameGPT-6 Astra 1,050,000 · Muse Spark 1.2 1,048,576 tokens
  • Widest inputsMuse Spark 1.2GPT-6 Astra: Text, Images, PDFs · Muse Spark 1.2: Text, Images, PDFs, Audio, Video
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightGPT-6 AstraMuse Spark 1.2
CapabilityCapabilities Index (ECI)50%10083
Price25%034
Inputs & features15%80100
Context window10%6161
Overall100%68/10071/100
02 — Side by side

Every spec in one table

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

GPT-6 Astra vs Muse Spark 1.2 specifications side by side
SpecificationGPT-6 AstraOpenAIMuse Spark 1.2Meta
Capability
Capabilities Index (ECI)169.1 (best)155.2
ECI rank#1 of 165 (best)#38 of 165
GPQA DiamondGraduate-level science questions95.8%—
FrontierMath Tiers 1–3Research-level mathematics93.7%—
OTIS Mock AIME 2024–2025Competition mathematics100%—
SimpleQA VerifiedShort factual questions75.6% (best)60.3%
Price per million tokens
Input$10.00$1.25 (best)
Output$50.00$4.25 (best)
Cached input$1.00$0.15 (best)
Blended (3:1)$20.00$2.00 (best)
Long-context rateOver 272K: $20.00 / $75.00Same 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
AudioNoYes
VideoNoYes
ReasoningYeslow · medium · high · xhigh · maxYesminimal · low · medium · high · xhigh
Tool callingYesYes
Structured outputYesYes
Availability
WeightsProprietaryProprietary
API model IDgpt-6-astramuse-spark-1.2
API providers37 (best)18
ReleasedSep 4, 2026Aug 5, 2026
Knowledge cutoffApr 30, 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 Astra$200.00
  • Muse Spark 1.2$21.00
04 — Questions

Which should you choose?

Which is better: GPT-6 Astra or Muse Spark 1.2?

It is close. Our weighted score puts them within 3 points (Muse Spark 1.2 71/100, GPT-6 Astra 68/100), so choose by what matters most for your work: GPT-6 Astra for raw capability and Muse Spark 1.2 on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, GPT-6 Astra or Muse Spark 1.2?

Muse Spark 1.2 is cheaper at $1.25 input / $4.25 output per million tokens (official Meta API price). GPT-6 Astra costs $10.00 input / $50.00 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $2.00 per million tokens for Muse Spark 1.2 versus $20.00 for GPT-6 Astra (10× as much).

Which scores higher on benchmarks?

GPT-6 Astra scores higher on the Capabilities Index (ECI): GPT-6 Astra 169.1 (#1 of 165) and Muse Spark 1.2 155.2 (#38 of 165). Their confidence ranges do not overlap (165.9–174.3 vs 152.9–157.6), so the gap is a real one. On individual benchmarks: SimpleQA Verified — GPT-6 Astra 75.6%, Muse Spark 1.2 60.3%.

Which is better for coding?

There are no published SWE-bench Verified results for GPT-6 Astra and Muse Spark 1.2 yet, so there is no like-for-like coding score. On overall capability, GPT-6 Astra 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 Astra 1,050,000 and Muse Spark 1.2 1,048,576 tokens. Maximum output per response: GPT-6 Astra up to 128,000, Muse Spark 1.2 up to 131,072 tokens.

Which can read images, PDFs, audio or video?

GPT-6 Astra accepts text, images and PDFs; Muse Spark 1.2 accepts text, images, PDFs, audio and video. Muse Spark 1.2 handles the widest range of inputs.

Are any of these open source?

No. GPT-6 Astra and Muse Spark 1.2 are proprietary and only available through APIs and apps.

Which is newer?

GPT-6 Astra is the newest, released Sep 4, 2026. Muse Spark 1.2 came out Aug 5, 2026. Knowledge cutoff: GPT-6 Astra Apr 30, 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 Nov 2, 2026.

05 — Keep comparing

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