GPT-Image-1.5 Image Generation API

OpenAI’s latest flagship image generation model, 4x faster, superior text rendering, LMArena #1.

GPT-Image-1.5 is OpenAI’s latest flagship image generation model, released in December 2025. It surpasses its predecessor in speed, text rendering, and editing precision. Ranked #1 on LMArena Text-to-Image leaderboard with 1277 Elo.

​

Key Features

4x Speed Boost

Most images generate in under 10 seconds, 4x faster than GPT-Image-1

Superior Text Rendering

Supports dense text, markdown tables, and small typography for infographics and posters

Precision Editing

Preserves composition, lighting, and brand elements across 5+ editing iterations

Leaderboard #1

LMArena Text-to-Image 1277 Elo, Design Arena 1344, AA Arena 1272

​

Comparison with GPT-Image-1

Feature	GPT-Image-1.5	GPT-Image-1
Generation Speed	Under 10s (4x faster)	Standard
Text Rendering	Excellent (dense text, tables, small type)	Good
Editing Precision	High-fidelity element preservation	Standard
Instruction Following	More precise and consistent	Standard
Cost	~20% cheaper than GPT-Image-1	Standard pricing
LMArena Elo	1277 (#1)	-

​

Pricing

​

Token-Based Pricing

Token Type	Price
Input Tokens	$5.00 / million tokens
Output Tokens	$10.00 / million tokens

​

Per-Image Pricing

Low Quality

Size	Price
1024×1024	$0.009 / image
1024×1536	$0.013 / image
1536×1024	$0.013 / image

Medium Quality

Size	Price
1024×1024	$0.034 / image
1024×1536	$0.051 / image
1536×1024	$0.050 / image

High Quality

Size	Price
1024×1024	$0.133 / image
1024×1536	$0.200 / image
1536×1024	$0.200 / image

The system automatically selects the more favorable billing method. Final charges are based on actual consumption.

​

API Usage

​

Endpoint

https://api.apiyi.com/v1/images/generations

​

Request Examples

cURL

curl https://api.apiyi.com/v1/images/generations \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "gpt-image-1.5",
    "prompt": "A professional infographic about AI trends in 2026, with charts, icons, and readable text labels",
    "size": "1024x1536",
    "quality": "high",
    "output_format": "png"
  }'

from openai import OpenAI

client = OpenAI(
    api_key="YOUR_API_KEY",
    base_url="https://api.apiyi.com/v1"
)

response = client.images.generate(
    model="gpt-image-1.5",
    prompt="A professional infographic about AI trends in 2026, with charts, icons, and readable text labels",
    size="1024x1536",
    quality="high",
    output_format="png"
)

print(response.data[0].url)

import OpenAI from 'openai';

const client = new OpenAI({
  apiKey: 'YOUR_API_KEY',
  baseURL: 'https://api.apiyi.com/v1'
});

const response = await client.images.generate({
  model: 'gpt-image-1.5',
  prompt: 'A professional infographic about AI trends in 2026, with charts, icons, and readable text labels',
  size: '1024x1536',
  quality: 'high',
  output_format: 'png'
});

console.log(response.data[0].url);

​

Request Parameters

Parameter	Type	Required	Description
model	string	Yes	Model name, use gpt-image-1.5
prompt	string	Yes	Image description (max 1000 characters)
n	integer	No	Number of images, default 1, max 10
size	string	No	1024x1024, 1536x1024, 1024x1536, auto (default)
quality	string	No	low, medium, high, auto (default)
output_format	string	No	png (default), jpeg, webp
output_compression	integer	No	Compression level (0-100%), JPEG/WebP only
background	string	No	transparent, opaque, auto (default)
input_fidelity	string	No	Set to high for high-fidelity preservation of first 5 input images during editing
response_format	string	No	url (default) or b64_json

​

Response Format

{
  "created": 1702486395,
  "data": [
    {
      "url": "https://..."
    }
  ]
}

​

Best Use Cases

​

Infographics and Typography

GPT-Image-1.5 has the strongest text rendering capability among AI image generation models:

• Infographic generation
• Product posters and marketing materials
• Social media visual content
• Data visualization with tables
• Brand assets (precise logo and brand element preservation)

{/* Infographic example */}
response = client.images.generate(
    model="gpt-image-1.5",
    prompt="Create a clean infographic comparing 3 AI models: GPT-5, Claude 4, Gemini 3. Include performance bars, pricing info, and feature comparison table. Modern flat design, blue and white color scheme.",
    size="1024x1536",
    quality="high"
)

​

Product Photography and E-commerce

{/* Product showcase example */}
response = client.images.generate(
    model="gpt-image-1.5",
    prompt="Professional product photography of modern wireless earbuds case on white marble surface, soft studio lighting, 45-degree angle, clean background",
    size="1024x1024",
    quality="high"
)

​

Iterative Editing

GPT-Image-1.5 supports multi-round precise editing, maintaining consistency in composition, lighting, and brand elements across 5+ iterations.

​

FAQ

Is GPT-Image-1.5 more expensive than GPT-Image-1?

Per-image pricing is slightly higher (due to higher token unit prices), but it’s 4x faster with better quality. Token pricing is $5.00/M input and $10.00/M output. Actual cost per image varies based on prompt complexity.

Can I switch directly from GPT-Image-1?

Yes, simply change the model parameter from gpt-image-1 to gpt-image-1.5. The API format and parameters are fully compatible.

How strong is the text rendering?

GPT-Image-1.5 can accurately generate dense text, markdown tables, and small typography. It ranks #1 on both LMArena Text-to-Image and Design Arena leaderboards.

Does it support transparent backgrounds?

Yes. Set background: "transparent" and use png or webp format to get transparent background images.

How long are image URLs valid?

Generated image URLs are typically valid for 24 hours. We recommend downloading and saving them promptly.

​

Related Resources

GPT-Image Series Overview

View the complete GPT-Image series comparison and selection guide

GPT-Image-1

Classic image generation model, ideal for general use

OpenAI official documentation: platform.openai.com/docs/models/gpt-image-1.5