AI Video Prompting Guide 2026: Grok Imagine & Kling 3.0 (with Pricing)
Great AI video prompts are not longer — they are structured. This prompting guide covers Grok Imagine and Kling 3.0, with pricing on Soup.video and direct links to each studio so you can test immediately.
The universal video prompt formula
Use this stack for almost every model:
- Subject — who/what is on screen
- Action — what changes over time
- Camera — move, angle, lens
- Light & color — time of day, practicals, grade
- Style / medium — photoreal, anime, 35mm, documentary
- Constraints — aspect ratio intent, “no text”, “single subject”
Template:
[Subject] [action]. [Camera move + shot size]. [Lighting]. [Environment]. [Lens/style].
Grok Imagine prompting guide
Studio: Grok Imagine · Grok Imagine 1.5
What Grok does best
- Fast social concepts
- Stylized motion and “vibe” clips
- Image-to-video that respects a clear still (1.5)
Prompt patterns that work
High-energy short-form
A streetwear model power-walks through a wet Tokyo crosswalk, neon reflections, tracking shot at hip height, rainy night, kinetic, 9:16 vertical
Product beauty
Matte black wireless earbuds rotate on a glossy pedestal, soft studio rim light, macro lens, slow orbit, clean minimal background
Image-to-video (1.5) Describe motion only:
Gentle hair movement in wind, subtle smile, slow push-in, natural window light
Grok Imagine pricing (Soup.video)
| Res | 6s | 10s | 15s | 30s |
|---|---|---|---|---|
| 480p | ~$0.10 | ~$0.15 | ~$0.25 | ~$0.75 |
| 720p | ~$0.15 | ~$0.25 | ~$0.30 | ~$1.00 |
Grok Imagine 1.5: ~$0.10/s (480p), ~$0.15/s (720p), ~$0.25/s (1080p)
Modes on classic Grok Imagine: normal, fun, spicy.
Kling 3.0 prompting guide
Studio: Kling 3.0 Director
What Kling does best
- Cinematic physics and camera pans
- Multi-shot storytelling
- Native audio when you need ambience/dialogue energy
Prompt patterns that work
Single-take cinema
A cowboy rides along a ridge at sunrise, dust trailing behind the horse, sweeping crane shot rising over the canyon, golden volumetric light, anamorphic 35mm, photoreal western
Macro detail
Extreme macro of honey dripping onto toast, slow motion, warm kitchen window light, shallow depth of field, tactile texture
Multi-shot thinking Write each beat clearly if using Director Studio:
Shot 1: close-up of hands lighting a match. Shot 2: wide of a campsite fire blooming. Shot 3: silhouette of hikers against the sparks.
Kling 3.0 pricing (Soup.video)
| Mode | Per second | 5s no audio | 5s + audio |
|---|---|---|---|
| Standard | $0.12 / $0.18 | $0.60 | $0.90 |
| Professional | $0.16 / $0.25 | $0.80 | $1.25 |
| 4K Cinematic | $0.60 | $3.00 | $3.00 |
Durations: 3–15 seconds. Pro audio + voice control is $0.29/s. Full details on the Kling page.
Side-by-side: when to use which model
| Goal | Prefer |
|---|---|
| Cheap rapid A/B for TikTok | Grok Imagine |
| Animate one hero photo | Grok Imagine 1.5 |
| Film-like motion + multi-shot | Kling 3.0 |
| Photoreal brand film | Veo 3.1 |
| Audio-forward social story | Seedance 2.0 |
Negative / cleanup language (use sparingly)
Instead of huge negative lists, add short constraints:
- “single subject, uncluttered background”
- “no on-screen text, no logos”
- “natural anatomy, stable hands”
Prompt iteration workflow (saves credits)
- Draft at the cheapest tier (Grok 480p or Kling Standard 5s)
- Lock subject + action
- Upgrade camera/lighting wording
- Re-run final on higher res/mode
- Optional: generate a matching thumbnail with an image model
Top up only what you need: Pricing. Automate winners via the API.
FAQ: AI video prompting
How long should an AI video prompt be?
Usually 1–3 sentences. Clarity beats essay length.
Should I mention the aspect ratio in the prompt?
Set it in the UI (9:16 / 16:9). You can reinforce “vertical composition” in text for social clips.
Where do I practice these prompts?
Grok Imagine and Kling 3.0 on Soup.video.
Master the formula, spend credits intentionally, and ship more usable clips per dollar than subscription-locked platforms.