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Gemini 3.1 Pro Preview vs Muse Spark Open

SpecGemini 3.1 Pro PreviewMuse Spark Open
Respan Index43.9 (#51)42.8 (#53)
Blended price per 1M$2.25$2
Context window1.0M1.0M
Input / output per 1M$1 / $6$1.25 / $4.25
Max output66K-
Inputtext, vision, audiotext, vision, video, audio
Released2026-02-192026-10-15

Respan Index by category

Each category is scored 0 to 100, and how far ahead the winner is. Leads under a point are close to even.

CategoryGemini 3.1 Pro PreviewMuse Spark Open
Coding15.6 Gemini 3.1 Pro Preview21.7 Muse Spark Open
Agents53.6 Gemini 3.1 Pro Preview44.5 Muse Spark Open
Reasoning46.2 Gemini 3.1 Pro Preview50.1 Muse Spark Open
Knowledge & language72.5 Gemini 3.1 Pro Preview56.6 Muse Spark Open
Human preference52.2 Gemini 3.1 Pro Preview54.0 Muse Spark Open

How the Respan Index works

Benchmarks both report

Muse Spark Open leads on 6 of the 9 benchmarks both report. Higher is better. Each score links to where it was published.

BenchmarkGemini 3.1 Pro PreviewMuse Spark Open
SAGE 1.1 (Vals AI)83.2%85.8%
APEX-Agents (Mercor)35.1%33.4%
LMArena WebDev (LMArena)14471526
FrontierMath Tier 4 v2 (Epoch AI)26.8%31.7%
FrontierMath Tiers 1-3 v2 (Epoch AI)59.6%69.8%
GPQA Diamond94.3%89%
OTIS Mock AIME 2024-2025 (Epoch AI)95.6%98.1%
SimpleQA Verified73.5%56.6%
Terminal-Bench 4.0 (Vals AI)2.5%6.6%

FAQ

Is Gemini 3.1 Pro Preview better than Muse Spark Open?

Gemini 3.1 Pro Preview scores 43.9 on the Respan Index (#51), ahead of Muse Spark Open at 42.8 (#53). Muse Spark Open leads on 6 of the 9 benchmarks both report.

Which is cheaper, Gemini 3.1 Pro Preview or Muse Spark Open?

Gemini 3.1 Pro Preview lists at $1 input and $6 output per 1M tokens; Muse Spark Open at $1.25 and $4.25. Muse Spark Open is 1.1x cheaper per token at list price.

Which has the larger context window?

Both accept 1.0M tokens of context.

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