Muse Spark Open

Meta, open weights, released Oct 2026, run at provider defaults through OpenRouter, served by Together. It built the same five pages as every model on season 0.6.1 of the Rams Index, and Rams graded each one at desktop and phone size.

Rams Index, 0 to 100

3.8

95% interval 2.9–5.2

Rank: 25of 26 models by Index; the paired intervals allow 25 to 26
Cost per page: $0.062Generation only, list price on run day
Earlier judges: 76.4Under the grade sum this board used until 10/28, GPT-5.6 Terra placed it 16th of 26 and the Claude judge 21th.
Grade sum: 25.77Seven 1–5 grades, out of 35
Pages judged: 1010 judge passes, 2 builds per brief
Defects per page: 6.0Text under 12px (10 of 10)

Rank 25 of 26; the data allows anywhere from 25 to 26. Within noise of Muse Wonder: the gap to it sits inside the noise, so the board can't order them yet. Clearly behind GPT-6.1 Sol, GPT-6 Astra, Grok 4.7, Claude Fable 5.1, GPT-6.1 Terra, GLM 5.3, Claude Opus 5.5, Claude Sonnet 5.5, Mistral Large 4, GPT-6 Luna, Claude Haiku 5.5, GPT-5.6 Sol, Claude Fable 5, Kimi K3, Kimi K3.1 Pro, GLM 5.3 Prime, DeepSeek V4 Pro, Claude Opus 4.8, MiMo V2.6 Pro, Gemini 4 Argon, Gemini 3.8 Flash, MiniMax M3, Qwen 3.8 Max and Qwen 3.8 Max Prime. Not clearly ahead of any model.

Checked against one designer · 63% agreementSeason 0.6.1New this seasonProvisional: 1.0 judge passes per page, protocol 2

Grades by dimension

The seven grades behind the Index, 1 to 5, mean of desktop and phone. The tick is the mean across all 26 models.

Hierarchy3.4519 of 26
Typography3.3020 of 26
Spacing3.0026 of 26
Color3.5016 of 26
Components3.4517 of 26
Composure3.2522 of 26
Craft3.3520 of 26

Bars start at 2.8 and end at 4.6, the range the board uses, so small differences show.

Index by brief

The same Index on each of the five briefs, and where the model places on that brief among all 26.

Landing4.725 of 26
Dashboard2.025 of 26
Settings8.023 of 26
Pricing4.423 of 26
Article2.326 of 26

Bars run from 0 to 100.

How it ran

Every model runs at its provider's default settings, through the same harness, with the same budget per page.

Effort: DefaultThe provider’s default. We send no effort or thinking setting
Time per page: 137sMedian over every build, broken ones included
Output tokens: 13.8kMedian per page, reasoning included
Reasoning tokens: 1.6kMedian per page, as the API reports them
Broken pages: 0 of 10Every build came back as a whole page
Criticals: 40%4 of 10 scored pages had a critical issue in their first Rams code review
Built through: OpenRouterServed by Together

Best and worst page

Of its 10 judged pages, the one the judge graded highest and the one it graded lowest, with the judge's top findings on each, most severe first.

Best: Settings14.0
Index on this page, one judge pass. Brief mean 8.0.
- Redundant 'Account settings' label repeated in sidebar and page titleModerate
- Bio character count hint left-truncated in element index (visual '74 / 160 characters' renders correctly but hint text misaligns with textarea baseline rhythm)Moderate
- Inconsistent toggle states in Notification preferences: 'Billing & invoices' Push column cell is emptyModerate
Worst: Dashboard0.5
Index on this page, one judge pass. Brief mean 2.0.
- Competing secondary stats in chart meta stripModerate
- Episode list rows have uneven vertical rhythm between rank groupsModerate
- Stat-card change badges inconsistent in widthModerate