Grok 4.7 vs Muse Spark 1.3 (thinking)
Should you write with Grok 4.7 or Muse Spark 1.3 (thinking)? On this page the only thing that changes is the model. Both wrote their own version of the scripts behind 10 of my What's AI videos, five drafts per script, and four judges (three LLM judges from three model families plus Jev, a typed judge from TypeSafe) scored every draft blind, with my finished script as the reference. Grok 4.7 leads overall, 87.6 to 82.5.
The verdict
Grok 4.7 is #32 and Muse Spark 1.3 (thinking) is #83, and Grok wins every metric. The biggest gap is Visual Cue Quality, about ten points, and the rest land between about three and eight. Muse is the cheap, fast one, about four cents a script against twenty-seven and just over a minute against almost eight. Fine for rough drafts, but the writing isn't close.
Pick Grok 4.7 for stronger scripts and better visual cues.
Pick Muse Spark 1.3 (thinking) for fast, cheap first drafts you plan to rewrite.
How to read these numbers
Overall vs Elo. Overall is the weighted rubric score. Elo compares each model's five-draft average with every other model's, script by script, and counts gaps inside run-to-run noise as draws, so it rewards winning often and can disagree with overall.
Reading the Elo intervals. Each 95% range comes from resampling every model's recorded run scores on each task and re-ranking. Comparing these separate ranges does not test the Elo gap between two models: far apart is strong evidence, and overlap isn't a tie. The tasks stay fixed, so the ranges say nothing about new tasks (the long version).
Metric by metric: where the gap comes from
Blue is Grok 4.7, orange is Muse Spark 1.3 (thinking), and the solid bar takes the metric. The weight under each name is how much it counts toward the overall. Weighted by how much each metric counts, Tone & Voice Match does the most to put Grok 4.7 ahead: it leads there by 5.2 points. If you care about one thing, say voice or length, go straight to that row.
Cost, speed, and consistency
Quality is half the decision. The other half is what each script costs you, how long you wait, and how often you get a bad draft. The lead has a price: Grok 4.7 costs about 6.5x as much per script as Muse Spark 1.3 (thinking).
| Grok 4.7 | Muse Spark 1.3 (thinking) | |
|---|---|---|
| Overall / 100 | 87.6 | 82.5 |
| Writing Elo | 2143 | 1629 |
| Score spread across drafts (± overall std) | 2.490 | 2.600 |
| Cost per script (USD) | 0.267 | 0.041 |
| Avg time per script (min) | 7.7 | 1.3 |
| Open weights | No | No |
Green wins the row, and for spread, cost and time, lower wins. Cost is one script at recorded list prices, uncached and without judging, so your real bill will differ. Spread is how much the overall score moves across a model's drafts, and time is the average time to get one accepted script, retries included.
Want the script-by-script detail? Full scorecards: Grok 4.7 · Muse Spark 1.3 (thinking). The whole scoring pipeline is on the methodology page.
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