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ModelCap

Head-to-head comparison

Gemini 3.1 Pro Preview vs Muse Spark 1.3

Gemini 3.1 Pro Preview (Google) and Muse Spark 1.3 (Meta) compared on the ModelCap Index, API price, context window, provider availability, weight access and every public benchmark board they share. Figures are the same ones shown on the live rankings; nothing here is a hidden score.

Snapshot as of 3 September 2026

As of 3 September 2026, Muse Spark 1.3 holds the stronger ModelCap Index position (#4 vs #8); and Muse Spark 1.3 is 2.8× cheaper per output token ($4.25/1M vs $12.00/1M).

Which should you choose?

Choose Gemini 3.1 Pro Preview if…

  • you want provider choice — 2 listed API providers against 1.

Choose Muse Spark 1.3 if…

  • you want the stronger overall ModelCap Index position — #4 against #8 (81.7 vs 78.5 points).
  • API cost matters — $4.25/1M output tokens against $12.00/1M, about 2.8× cheaper.
  • your workload is prompt-heavy — input tokens cost $1.25/1M against $2.00/1M.
  • AA Intelligence Index is your yardstick — 62.1 against 47.7.
  • you want the more recently listed model — Muse Spark 1.3 was listed 2 September 2026, Gemini 3.1 Pro Preview 19 February 2026.

Gemini 3.1 Pro Preview vs Muse Spark 1.3: specs, pricing and context

Specification comparison of Gemini 3.1 Pro Preview and Muse Spark 1.3
FieldGemini 3.1 Pro PreviewGoogleMuse Spark 1.3Meta
ModelCap Index position#8#4
Index score78.581.7
EvidenceMeasuredMeasured
Input price / 1M tokens$2.00$1.25
Output price / 1M tokens$12.00$4.25
Context window1M tokens1M tokens
Max output tokens66K944K
API providers listed21
Weight accessAPI onlyAPI only
Input modalitiesAudio, File, Image, Text, VideoText, Image, Video, File, Audio
First listed19 February 20262 September 2026
PublisherGoogleMeta

Evidence: 4 public benchmark observations across 4 boards · 1 public benchmark observation across 1 board. Prices are the lowest listed API offer per million tokens observed on the OpenRouter catalogue.

Benchmark scores: Gemini 3.1 Pro Preview vs Muse Spark 1.3

Public benchmark boards where Gemini 3.1 Pro Preview or Muse Spark 1.3 has a published result
BoardGemini 3.1 Pro PreviewMuse Spark 1.3Leads
Arena codingArena (LMArena)15211516–1526—Only one result
LMArena AgentLMArena-3.1%-4.0%–-2.2%—Only one result
AA Intelligence IndexArtificial Analysis47.7intelligence-index62.1intelligence-indexMuse Spark 1.3
AA Terminal-Bench 2.1Artificial Analysis73.8%terminal-bench-2.1—Only one result
AA τ²-Bench TelecomArtificial Analysis95.6%tau2-bench-telecom—Only one result
AA Humanity's Last ExamArtificial Analysis47.0%humanitys-last-exam—Only one result

Scores are the sources' own published figures for each model's best evaluated configuration; ModelCap never re-runs a benchmark.

Want a different pairing? Open the interactive comparison tool to swap either model for any current ranked language model.

Gemini 3.1 Pro Preview vs Muse Spark 1.3: common questions

Is Gemini 3.1 Pro Preview better than Muse Spark 1.3?

Muse Spark 1.3 ranks higher on the ModelCap Index as of 3 September 2026: #4 against #8. That is a capability ranking built from public benchmark evidence with published uncertainty; whether it is "better" for you also depends on price, context and where you can run it.

Is Gemini 3.1 Pro Preview cheaper than Muse Spark 1.3?

Muse Spark 1.3 is cheaper on output tokens: $4.25/1M against $12.00/1M. Input tokens are $2.00/1M for Gemini 3.1 Pro Preview and $1.25/1M for Muse Spark 1.3. Prices are the lowest listed API offer ModelCap observed, in USD per million tokens.

Which has the bigger context window, Gemini 3.1 Pro Preview or Muse Spark 1.3?

Both publish a 1M-token context window.

Which is better for coding, Gemini 3.1 Pro Preview or Muse Spark 1.3?

The two models do not share a coding benchmark board on ModelCap yet, so no head-to-head coding score is published; the ModelCap Index position is the closest overall signal.

Are Gemini 3.1 Pro Preview and Muse Spark 1.3 open-weight models?

Gemini 3.1 Pro Preview: API only. Muse Spark 1.3: API only. Open weights mean the checkpoint can be downloaded and self-hosted under its licence; API-only models are available solely through hosted endpoints.

Where can I run Gemini 3.1 Pro Preview and Muse Spark 1.3?

ModelCap currently lists 2 API providers for Gemini 3.1 Pro Preview and 1 for Muse Spark 1.3, from the OpenRouter catalogue snapshot the site serves; each model page lists the providers and their prices.

How current is this Gemini 3.1 Pro Preview vs Muse Spark 1.3 comparison?

Every figure comes from the sealed ModelCap dataset published 3 September 2026; the page re-renders within a minute of each data refresh, and the ModelCap Index positions are the same ones shown on the live rankings.

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