Best AI Model for Short Video Scripts: Gemini (Google) vs. GPT (OpenAI) vs. Grok (xAI)

Written By Duncan Day

Short video scripts live or die on clarity, pace, and a crisp call-to-action. To see which foundation model hits those marks most reliably inside Subdraft, we ran the same brief: “How Subdraft Works”, through each model using the Regular preset. 

Below you’ll find quick intros, the raw outputs, and ratings with a winner at the end.

How we tested (inside Subdraft)

  • Content type: Short video script (10 seconds target; hook → 2–8s cuts → close/CTA).

  • Prompt theme: “How Subdraft Works.”

  • Preset: Regular for each model.

  • What we looked for: Hook strength, structural clarity, accuracy to Subdraft mechanics (Short Form Blitz, benchmarks, scoring, export), and LinkedIn-readiness of phrasing and CTA.

The Contenders

GPT (OpenAI) / Regular

GPT is known for tight instruction-following and strong structural discipline. For short video work in Subdraft, that usually shows up as well-ordered beats, specific on-screen cues, and a clean CTA. GPT tends to keep language precise and production-friendly, making it easy to storyboard or hand to an editor.

The tradeoff: GPT can default to “safe” phrasing unless nudged for a spicier tone. Still, for repeatable, brand-safe outputs you can scale, GPT is consistently dependable.

Gemini (Google) / Regular

Gemini often excels at procedural clarity—great when you need a stepwise, “do this → get that” rundown. In short scripts, Gemini’s voice leans instructional and scannable, which maps nicely to feature explainers and walkthroughs.

On the flip side, Gemini can read a bit utilitarian. If you want cinematic flair or personality-forward language, you may need to add tone benchmarks or a stylistic nudge in Subdraft.

Grok (xAI) / Regular

Grok’s vibe skews bold and high-energy. It’s good at punchy hooks and hype-forward framing that can energize a concept or brand moment. In Subdraft, that can translate into big, kinetic openers that grab attention in the first two seconds.

The risk: Grok’s enthusiasm occasionally outruns precision, and outputs can drift generic without extra constraints. It shines when you want swagger—but you’ll likely refine to keep on-message.

The Test Outputs (as generated in Subdraft)

OpenAI Regular

0–2s Hook:

Visual: Rapid zoom into a blinking status dot that flips from gray to bright green.

VO/on-screen text (bold): "Make drafts happen—fast."

2–8s Main Cuts (1–3 fast cuts with clear captions):

Cut 1 (2–4s): Screen split showing a URL being pasted -> AI generating a “Short Form Blitz.”

Caption: "Paste a source. Generate a blitz."

Cut 2 (4–6s): Quick swipe to benchmark sliders changing (word length, % change, required words) and instant score update.

Caption: "Tweak benchmarks. Watch the score."

Cut 3 (6–8s): Fast shot of Export menu pushing content to Slack/Notion/Trello with a success toast that says "Exported."

Caption: "Refine. Export. Ship."

8–10s Close / Engagement Cue:

Visual: Creator on camera, smiling, pointing to bold text card.

Text card/VO: "Try Subdrafts — what will you blitz first? Tap to test."

The Verdict: OpenAI understood the assignment perfectly. It broke the script down by seconds (latency was negligible), provided visual direction, and distinct Voice Over (VO) cues. It correctly identified core Subdraft features like the "Short Form Blitz" and the "Export" functionality. The pacing is realistic for a 10-second spot.

  • Edit Percentage Required: 0%

  • Structural Adherence: High

  • Rating: 5/5

Google Regular

Tired of unpredictable AI content? Stop guessing.

1. Input Source & Generate Blitz. (Visual: URL input leads to 'Short Form Blitz' templates.)

2. Set Benchmarks (Length, 100% Keywords). (Visual: Focus on benchmark sliders moving, showing custom control.)

3. Watch Your Score Update & Export. (Visual: Score indicator rapidly changes, 'Exported' status flashes with Slack/Notion icons.)

SUBDRAFT: CONTROL YOUR CONTENT.

The Verdict: Gemini struggled with the "script" format. While it captured the correct information, mentioning Benchmarks and the Scoring system, it formatted the output as a bulleted checklist rather than a timed video script. To use this, a creator would have to manually determine timing and transitions. This requires a high degree of refinement to be production-ready.

  • Edit Percentage Required: 40% (Needs reformatting for timing)

  • Structural Adherence: Low

  • Rating: 3.5/5

xAI Regular

0-2s: Bold Hook

Quick zoom into a blank screen exploding into colorful text blitzes with fast motion graphics.

VO: "Subdraft revolutionizes content creation!"

2-8s: Fast Cuts

Cut 1: User pastes URL or text into Subdraft dashboard. Caption: "Paste URL or Text"

Cut 2: AI generates 7 blitz types. Screen fills with headlines, posts, bullets. Caption: "AI Generates Blitz Templates"

Cut 3: Sliders adjust benchmarks (10% change, keywords). Score updates live. Caption: "Refine with Benchmarks & Score"

VO: "Input → Generate → Refine → Export to Slack/Notion!"

8-10s: Engagement Cue

Creator on camera, excited thumbs up. Bold text card: "Try Subdraft Free Today! subdrafts.com"

VO: "Start now at subdrafts.com!"

The Verdict: Grok brought the energy. It nailed the timing structure similar to OpenAI and even included specific visual cues ("exploding into colorful text"). However, it fell into the "hype trap," using the phrase "Subdraft revolutionizes content creation!": a generic buzzword we typically try to avoid. It captured the workflow well, specifically mentioning the "7 blitz types" and "Refine with Benchmarks". It loses half a point only for the hyperbolic tone that might require a "Tone Adjustment" benchmark tweak.

  • Edit Percentage Required: 5% (Tone adjustment only)

  • Structural Adherence: High

  • Rating: 4.5/5

Verdict

Winner: GPT (OpenAI)

Why: The OpenAI Regular output is the most storyboard-ready with precise visual direction, faithful representation of Subdraft’s Short Form Blitz → Benchmarks/Score → Export flow, and a clean CTA you can ship with minimal edits. 

If you need repeatable quality at scale, GPT is the safest first choice.

Quick picks by use case:

  • Want crisp, handoff-ready scripts fast? Choose GPT (OpenAI).

  • Want step-by-step clarity for product explainers? Choose Gemini (Google).

  • Want a hype-forward opener for attention spikes? Choose Grok (xAI), then refine in Subdraft with benchmarks for tone and terminology.

Duncan Day
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