TL;DR
Grok Imagine Video ($0.05/second) competes on price with Seedance 1.5 Pro but caps output at 720p while most competitors offer 1080p. Its main implementation advantages are 1-second duration control up to 15 seconds and no cold starts. Use it for budget-conscious social video where 720p is acceptable. If you need 1080p, WAN 2.6 Flash ($0.125–0.25/5s) or Kling-style alternatives are better value.
Introduction
xAI’s Grok Imagine Video joined the video generation market in early 2026. This guide compares it with six established competitors:
- Sora 2
- Veo 3.1
- Seedance 1.5 Pro
- WAN 2.5
- WAN 2.6 Flash
- Vidu Q3
The implementation question is simple:
Does Grok’s lower pricing and duration control offset its 720p resolution cap?
Specifications at a glance
| Model | Max duration | Max resolution | Pricing approx |
|---|---|---|---|
| Grok Imagine Video | 15s, 1s increments | 720p | $0.05/second |
| Sora 2 | 20s | 1080p | ~$0.10/5s |
| Veo 3.1 | 8s | 1080p | $1.00–2.00/video |
| Seedance 1.5 Pro | 12s | 720p | $0.13–0.26/video |
| WAN 2.5 | 10s | 1080p capable | ~$0.10/5s |
| WAN 2.6 Flash | 15s | 1080p capable | $0.125–0.25/5s |
| Vidu Q3 | 16s | 1080p support | ~$0.15/5s |
Grok’s advantages
1. Generate exact clip durations
Grok supports 1-second increments up to 15 seconds.
That matters if your output needs to fit a specific slot, for example:
- 7-second social clip
- 12-second product teaser
- 15-second ad variant
- short video loop with exact timing
Many competing APIs expose fixed durations such as 5s, 8s, or 10s.
2. No cold starts
Grok’s API infrastructure keeps models warm, so first-request latency is expected to match subsequent requests.
For production workflows, this is useful when:
- generating video on user action
- running scheduled content jobs
- building internal creative tools
- comparing prompt variants interactively
3. Predictable pricing
At $0.05/second, cost calculation is straightforward:
duration_seconds × 0.05 = generation_cost_usd
Examples:
| Duration | Cost |
|---|---|
| 5s | $0.25 |
| 7s | $0.35 |
| 10s | $0.50 |
| 15s | $0.75 |
A 10-second Grok clip costs about $0.50, similar to Seedance 1.5 Pro and significantly below Veo 3.1 and Vidu Q3 in this comparison.
4. Multiple aspect ratios
Grok supports 7 preset aspect ratios, which helps when generating platform-specific assets.
Typical implementation flow:
- Store the target platform as metadata.
- Map the platform to an aspect ratio.
- Send the prompt, duration, and aspect ratio to the generation API.
- Save the output URL or asset ID with the platform label.
5. Synchronized audio
Grok includes native audio generation alongside video in the base price. This can simplify workflows where you need a complete social-ready clip rather than silent B-roll.
The 720p constraint
The main limitation is resolution: Grok Imagine Video caps output at 720p.
Most major competitors support 1080p output. That difference matters most when the generated video will be used in:
- desktop or TV playback
- professional production
- videos with readable text
- compositing or post-production workflows
- crops, zooms, or edits after generation
For mobile-first social content, 720p is often acceptable. For larger screens or production-grade usage, the quality gap versus 1080p becomes more visible.
Cost comparison: 10-second clip with audio
| Model | Approx cost | Notes |
|---|---|---|
| Grok Imagine Video | $0.50 | 720p cap |
| Seedance 1.5 Pro | $0.50 | Also 720p |
| WAN 2.6 Flash | $0.25 | 1080p capable, cheaper |
| WAN 2.5 | $1.00 | 1080p |
| Vidu Q3 | $1.50 | 1080p support |
| Sora 2 | $1.00+ | 1080p |
| Veo 3.1 | $2.00+ | 1080p, premium |
WAN 2.6 Flash is the strongest value comparison against Grok: it is cheaper, supports up to 15 seconds, and is 1080p capable.
Model selection guide
Use Grok Imagine Video when
- 720p is sufficient
- you need exact clip durations
- you are generating social content at scale
- you want predictable per-second pricing
- native audio generation is useful
- you are rapidly prototyping prompt variants
Use WAN 2.6 Flash when
- you need 1080p output
- cost is still important
- you want clips up to 15 seconds
- you are comparing production-ready alternatives to Grok
Use Seedance 1.5 Pro when
- you want ByteDance’s model behavior
- you are working with reference-guided generation
- 720p output is acceptable
- pricing similar to Grok is acceptable
Use Sora 2 when
- cinematic quality is the priority
- the scene has multiple complex elements
- you need up to 20 seconds
Use Veo 3.1 when
- you want premium short-form output
- quality matters more than cost
- you are generating hero assets or polished campaign content
Testing with Apidog
All models are available through WaveSpeedAI’s API. You can use Apidog to create comparable requests, reuse prompt variables, and validate responses.
A useful test is to run the same prompt through Grok Imagine Video and WAN 2.6 Flash, then compare the generated outputs at 100% zoom.
Request 1: Grok Imagine Video
Create a POST request:
POST https://api.wavespeed.ai/api/v2/xai/grok-imagine-video
Authorization: Bearer {{WAVESPEED_API_KEY}}
Content-Type: application/json
Request body:
{
"prompt": "A city street at dusk, people walking, neon signs reflecting on wet pavement",
"duration": 7,
"aspect_ratio": "16:9"
}
Request 2: WAN 2.6 Flash
Create a second POST request using the same prompt:
POST https://api.wavespeed.ai/api/v2/alibaba/wan-2-6-flash
Authorization: Bearer {{WAVESPEED_API_KEY}}
Content-Type: application/json
Request body:
{
"prompt": "A city street at dusk, people walking, neon signs reflecting on wet pavement",
"duration": 7,
"aspect_ratio": "16:9"
}
Suggested Apidog setup
Create a collection with shared variables:
WAVESPEED_API_KEY=your_api_key
PROMPT=A city street at dusk, people walking, neon signs reflecting on wet pavement
DURATION=7
ASPECT_RATIO=16:9
Then use the variables in both requests:
{
"prompt": "{{PROMPT}}",
"duration": {{DURATION}},
"aspect_ratio": "{{ASPECT_RATIO}}"
}
This keeps the comparison consistent. Only the model endpoint changes.
Basic assertions
Add these checks for both requests:
Status code is 200
Response body has field id
If the API returns asynchronous prediction jobs, store the returned id and poll the prediction status endpoint until the job completes.
A typical validation flow:
- Send the generation request.
- Assert
200. - Extract the prediction
id. - Poll the prediction endpoint.
- Wait until status is complete.
- Download or open the generated video.
- Compare Grok and WAN 2.6 Flash at 100% zoom.
The 720p vs 1080p difference is most visible when inspecting details such as signs, faces, building edges, and fine motion artifacts.
Practical decision matrix
| Requirement | Recommended model |
|---|---|
| Lowest cost with 1080p capability | WAN 2.6 Flash |
| Exact non-standard duration | Grok Imagine Video |
| 720p social content with audio | Grok Imagine Video |
| Premium cinematic output | Sora 2 |
| Highest-quality short hero content | Veo 3.1 |
| ByteDance model behavior | Seedance 1.5 Pro |
FAQ
Does Grok Imagine Video support image-to-video?
Check the current WaveSpeedAI documentation for supported modes. Text-to-video with audio is the confirmed capability.
Is 720p a problem for mobile-first content?
Usually not. For content viewed primarily on mobile screens, 720p is generally sufficient.
The limitation matters more when the video is viewed on larger screens, reused in production, or expected to preserve fine detail.
How does Grok compare on motion quality to Kling or Seedance?
xAI’s motion model is newer to the market. Current assessments indicate competitive quality for standard scenes, but complex motion and character consistency have not been benchmarked as thoroughly as more established models.
Can I generate 15-second clips at full 720p with audio for $0.75?
Yes.
15 seconds × $0.05/second = $0.75
That includes audio based on the pricing described above.
What aspect ratios does Grok support?
Grok supports 7 preset aspect ratios. Check WaveSpeedAI’s current documentation for the active list, since supported presets may expand after launch.
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