Gen4 Image
runway-gen4-imageRunway's Gen-4 Image model with references. Use up to 3 reference images to create the exact image you need. Capture every angle.
- Price
- $0.096/image
- Aspect ratios
- 16:9, 9:16, 4:3, 3:4, 1:1, 21:9
- Input β output
- Text β Image
- Developer
- Runway
- Updated
- September 24, 2026
Playground
Try Gen4 Image
Input & output
This run
$0.096 Β· 9.6 credits
For accounts without a purchase: runs above 2 credits need a top-up.
New here?
10 free credits ($0.10) when you sign up with Google
Usable 24 hours after sign-up, up to 5 runs per day and at most 2 credits per run. Other sign-in methods start without credits.
Examples
Open full size
InputPrompt
a close up portrait of @woman and @man standing in @park, hands in pockets, looking cool. She is wearing her pink sweater and bangles.
Settings
- aspect_ratio
- 4:3
- resolution
- 1080p
Open full size
InputPrompt
show me the man from @img_1 framed through the windshield of a car like the reference @img_2
Settings
- aspect_ratio
- 16:9
- resolution
- 1080p
Open full size
InputPrompt
@woman holds the @bottom up, the bottle is the subject, the @woman is visible but she is blurred, she is in the @living_room, it is a product photo shoot
Settings
- aspect_ratio
- 4:3
- resolution
- 1080p
About Gen4 Image
Gen4 Image is a model by Runway in the Image generation category. On Railwail, Gen4 Image costs $0.096 per image. Depending on the settings, the price ranges from $0.060/image to $0.096/image. Supported aspect ratios: 16:9, 9:16, 4:3, 3:4, 1:1, and 21:9.
Pricing
| resolution: 720p | $0.060 per image |
|---|---|
| resolution: 1080pDefault | $0.096 per image |
- 1 credit = $0.01
Cost calculator
Price calculator
Total
$9.60
960 credits
Per run
$0.096 Β· 9.6 credits
Fixed price per run, known before the run starts.
API
curl https://railwail.com/api/v1/images/generations \
-H "Authorization: Bearer $RAILWAIL_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "runway-gen4-image",
"prompt": "A lighthouse on a rocky coast at sunset, photorealistic"
}'import os
from openai import OpenAI
client = OpenAI(
api_key=os.environ["RAILWAIL_API_KEY"],
base_url="https://railwail.com/api/v1",
)
image = client.images.generate(
model="runway-gen4-image",
prompt="A lighthouse on a rocky coast at sunset, photorealistic",
)
print(image.data[0].url)import OpenAI from "openai";
const client = new OpenAI({
apiKey: process.env.RAILWAIL_API_KEY,
baseURL: "https://railwail.com/api/v1",
});
const image = await client.images.generate({
model: "runway-gen4-image",
prompt: "A lighthouse on a rocky coast at sunset, photorealistic"
});
console.log(image.data[0].url);// npm install railwail
import railwail from "railwail";
const rw = railwail(process.env.RAILWAIL_API_KEY);
const res = await rw.image("runway-gen4-image", "A lighthouse on a rocky coast at sunset, photorealistic");
console.log(res.data[0].url);Specifications
- Model ID
runway-gen4-image- Developer
- Runway
- Category
- Image generation
- Input
- Text
- Output
- Image
- Aspect ratios
- 16:9, 9:16, 4:3, 3:4, 1:1, 21:9
- Billing
- Fixed price, known before the run
- Catalog entry updated
- September 24, 2026
Input parameters
Inputs and settings from the model's input schema. The example in the API section shows which of them the API accepts.
promptrequiredType: TextDefault: βAllowed values: βaspectRatioType: ChoiceDefault: βAllowed values: 16:9, 9:16, 4:3, 3:4, 1:1, or 21:9
Tags
- replicate
- runwayml
- text-to-image
Use cases
Frequently asked questions
What is Gen4 Image?
Gen4 Image is a model by Runway in the Image generation category. On Railwail you can call it with an API key through the Railwail API.
How much does Gen4 Image cost on Railwail?
On Railwail, Gen4 Image costs $0.096 per image. Depending on the settings, the price ranges from $0.060/image to $0.096/image. The price is known before the run starts. Usage is paid from prepaid credits; 1 credit equals $0.01.
Which settings does Gen4 Image support?
According to its input schema, Gen4 Image knows these parameters: prompt and aspectRatio (16:9, 9:16, 4:3, 3:4, 1:1, or 21:9).
How fast is Gen4 Image?
There are not enough measured runs of Gen4 Image on Railwail yet to state a run time. It depends on the input, the settings and the load at the provider.
Is Gen4 Image better than FLUX 1.1 Pro?
That depends on the task. Gen4 Image (Runway) and FLUX 1.1 Pro (Black Forest Labs) are both models in the Image generation category. The comparison page shows their prices and specifications side by side.
Compare Gen4 Image and FLUX 1.1 ProHow do I use Gen4 Image through the API?
Create a Railwail API key and send your request with the model ID runway-gen4-image. Code examples for curl, Python and JavaScript are in the API section of this page.
Comparable models
All in this category- FLUX 1.1 ProBlack Forest Labs
Black Forest Labs' flagship text-to-image model. Faster generation than FLUX.1 Pro at higher prompt adherence, with strong photorealism and reliable spatial composition. Runs as a hosted Replicate model.
- Flux 1.1 Pro UltraBlack Forest Labs
FLUX 1.1 Pro in ultra mode. Up to 4 megapixel images with raw mode for photorealism.
- Flux DevBlack Forest Labs
Black Forest Labs' development model. Fast, high-quality image generation with LoRA support.
Use Gen4 Image via the API
One API key for every model on Railwail. Usage is charged from prepaid credits, 1 credit = $0.01.