Video Text to Video fal.ai

Grok Imagine 1.5 T2V

Grok Imagine 1.5 T2V costs $0.168/s (720p) on FairStack · a text to video model for Social video that needs sound, Short clips at a chosen aspect ratio, Quick looks at a concept before a longer render. No subscription required. Pay per generation with full REST API access. FairStack applies a transparent 20% margin on infrastructure cost so you always see the real price.

FairStack price

$0.168/s

720p

Platform fee

Flat 20%

Try Grok Imagine 1.5 T2V API Quickstart Last updated 2026-11-10

What is Grok Imagine 1.5 T2V?

Grok Imagine Video 1.5 is xAI's versioned 1.5 video model, generating video with audio directly from a prompt. Audio comes with the picture in the same request — there is no separate audio pass and no audio surcharge. Three resolution tiers (480p, 720p, 1080p) and any duration from 1 to 15 seconds, across seven aspect ratios including 3:2 and 2:3. Billing is per second of output and varies by tier, at the model's cost plus a flat 20% platform fee, shown before you spend. This is a separate entry from the older unversioned Grok Imagine video models, which remain available.

Key Features

Audio generated with the video

480p, 720p and 1080p tiers

Seven aspect ratios including 3:2 and 2:3

Any duration from 1 to 15 seconds

What are Grok Imagine 1.5 T2V's strengths?

Sound without a second pass

Wide aspect coverage

Flexible duration

What are Grok Imagine 1.5 T2V's limitations?

Audio cannot be disabled, so it is always priced in

1080p costs roughly three times 480p per second

What is Grok Imagine 1.5 T2V best for?

Social video that needs sound Short clips at a chosen aspect ratio Quick looks at a concept before a longer render

How much does Grok Imagine 1.5 T2V cost?

Metric

FairStack

Details

720p(default)

$0.168/s

Billed per second, 20% platform fee included.

480p

$0.096/s

Billed per second, 20% platform fee included.

1080p

$0.30/s

Billed per second, 20% platform fee included.

Subscription

None

Pay per generation only

How does Grok Imagine 1.5 T2V perform across capabilities?

Estimated from the Grok Imagine family and fal's launch description — NOT independently benchmarked. Re-score after a Visual Observatory sweep. PRD-1026.

motion quality

80%

visual quality

81%

prompt adherence

80%

temporal coherence

79%

character consistency

72%

camera control

72%

audio quality

78%

How do I use the Grok Imagine 1.5 T2V API?

curl

curl -X POST https://api.fairstack.ai/v1/generations/video \
  -H "Authorization: Bearer $FAIRSTACK_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "grok-imagine-1-5-t2v",
    "input": {
      "prompt": "Your prompt here"
    }
  }'

Python

import os
import requests

response = requests.post(
    "https://api.fairstack.ai/v1/generations/video",
    headers={
        "Authorization": f"Bearer {os.environ['FAIRSTACK_API_KEY']}",
        "Content-Type": "application/json",
    },
    json={
      "model": "grok-imagine-1-5-t2v",
      "input": {
        "prompt": "Your prompt here"
      }
    },
)

result = response.json()
print(result["data"])

Node.js

const response = await fetch("https://api.fairstack.ai/v1/generations/video", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.FAIRSTACK_API_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "model": "grok-imagine-1-5-t2v",
    "input": {
      "prompt": "Your prompt here"
    }
  }),
});

const result = await response.json();
console.log(result.data);

What parameters does Grok Imagine 1.5 T2V support?

Parameter

Type

Default

Details

aspect_ratio

enum

16:9

Options: 16:9, 4:3, 3:2, 1:1, 2:3, 3:4...

resolution

enum

720p

Options: 480p, 720p, 1080p

duration

integer

Range: 1–15

Frequently Asked Questions

How much does Grok Imagine 1.5 T2V cost?

Grok Imagine 1.5 T2V costs $0.168/s (720p) on FairStack as of 2026-11-10. This price includes FairStack's transparent 20% margin on infrastructure cost. No subscription or monthly fee — you pay per generation only. Minimum deposit is $1.

What is Grok Imagine 1.5 T2V and what is it best for?

Does Grok Imagine 1.5 T2V have an API?

Yes. Grok Imagine 1.5 T2V is available via FairStack's REST API at api.fairstack.ai. Send a POST request to /v1/generations/video with your API key, the model key, and an input object (input.prompt). Works with curl, Python requests, Node.js fetch, and any HTTP client. No SDK installation required.

How does Grok Imagine 1.5 T2V compare to other video models?

Grok Imagine 1.5 T2V excels at Social video that needs sound, Short clips at a chosen aspect ratio, Quick looks at a concept before a longer render. It is a text to video model priced at $0.168/s (720p) on FairStack. Key strengths: Sound without a second pass, Wide aspect coverage. Compare all video models at fairstack.ai/models.