What is the default Size value in GPT Image?

GPT Image's default Size is typically Medium (default). This works well for general use, but specialized prompts often benefit from adjustment. See our recommended values above for different use cases.

Does Size affect generation speed in GPT Image?

Minimally — this parameter primarily affects output characteristics rather than processing time. Choose your value based on the quality level you need.

What Size value is best for professional work?

For professional and commercial work, we recommend High. This ensures maximum quality while keeping generation practical.

Can I change Size after generating in GPT Image?

No — Size must be set before generation. However, you can quickly regenerate with a different Size value using the same prompt to compare results side by side.

Parameter GuideGPT Image

GPT Image Size Guide

This page explains the size parameter in GPT Image — how image dimensions affect output quality, aspect ratios, and appropriate use cases for each option. Choosing the right size upfront avoids costly regenerations and ensures your image fits its intended context without cropping or distortion.

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Bahasa IndonesiaHalaman ini menjelaskan parameter ukuran di GPT Image — bagaimana dimensi gambar memengaruhi kualitas output, rasio aspek, dan kasus penggunaan yang tepat untuk setiap pilihan. Memilih ukuran yang tepat sejak awal menghindari regenerasi yang mahal dan memastikan gambar sesuai dengan konteks yang dimaksud tanpa pemotongan atau distorsi.

日本語このページでは、GPT Imageのサイズパラメータについて解説します。画像のサイズが出力品質、アスペクト比、各オプションの適切なユースケースにどう影響するかを説明します。最初から適切なサイズを選ぶことで、コストのかかる再生成を避け、画像がトリミングや歪みなく意図したコンテキストに合うようになります。

한국어이 페이지에서는 GPT Image의 size 파라미터를 설명합니다. 이미지 크기가 출력 품질, 종횡비, 각 옵션의 적합한 사용 사례에 어떤 영향을 미치는지 다룹니다. 처음부터 올바른 크기를 선택하면 불필요한 재생성을 피하고 이미지가 자르기나 왜곡 없이 의도한 용도에 맞게 됩니다.

PolskiTa strona wyjaśnia parametr rozmiaru w GPT Image — jak wymiary obrazu wpływają na jakość wyjściową, proporcje i odpowiednie przypadki użycia dla każdej opcji. Wybór właściwego rozmiaru z góry pozwala uniknąć kosztownych regeneracji i zapewnia, że obraz pasuje do zamierzonego kontekstu bez przycinania ani zniekształceń.

PortuguêsEsta página explica o parâmetro de tamanho no GPT Image — como as dimensões da imagem afetam a qualidade de saída, as proporções e os casos de uso adequados para cada opção. Escolher o tamanho certo logo no início evita regenerações custosas e garante que a imagem se encaixe no contexto pretendido sem cortes ou distorções.

РусскийНа этой странице объясняется параметр размера в GPT Image — как размеры изображения влияют на качество вывода, соотношение сторон и подходящие сценарии использования каждого варианта. Правильный выбор размера с самого начала позволяет избежать дорогостоящей повторной генерации и гарантирует, что изображение подойдёт под нужный контекст без обрезки или искажений.

TürkçeBu sayfa, GPT Image'daki boyut parametresini açıklamaktadır: görüntü boyutlarının çıktı kalitesini, en boy oranlarını ve her seçenek için uygun kullanım durumlarını nasıl etkilediğini ele alır. Baştan doğru boyutu seçmek, maliyetli yeniden üretimleri önler ve görüntünün kırpma veya bozulma olmadan amaçlanan bağlama uymasını sağlar.

中文本页介绍GPT Image中的尺寸参数——图像尺寸如何影响输出质量、宽高比以及每个选项的适用场景。提前选择正确的尺寸可以避免昂贵的重新生成，确保图像无需裁剪或变形即可适合预期用途。

Values & Usage

Size: LowLow

More variation and creative interpretation in the output

Size: Medium (default)Medium (default)

Balanced results suitable for most use cases

Size: HighHigh

More consistent and detailed output, closer to prompt intent

Size: MaximumMaximum

Highest fidelity to prompt — best for professional and final output

Example Prompts

Demonstrating Size at Low — More variation and creative interpretation in the output

beginner

Create a ukiyo-e image of scenic composition featuring landscape. The composition should feel dramatic with moonlit scene. Use vibrant complementary colors throughout. Every detail should be intentional — from the foreground elements to the overall mood. The final result should look like a professional ukiyo-e piece.

Demonstrating Size at Medium (default) — Balanced results suitable for most use cases

beginner

Create a cyberpunk image of scenic composition featuring landscape. The composition should feel serene with golden hour warmth. Use desaturated vintage tones throughout. Every detail should be intentional — from the color transitions to the overall mood. The final result should look like a professional cyberpunk piece.

Demonstrating Size at High — More consistent and detailed output, closer to prompt intent

intermediate

Create a surrealism image of scenic composition featuring landscape. The composition should feel dynamic with backlit silhouette. Use high-contrast monochrome throughout. Every detail should be intentional — from the material textures to the overall mood. The final result should look like a professional surrealism piece.

Demonstrating Size at Maximum — Highest fidelity to prompt — best for professional and final output

advanced

Create a concept art image of scenic composition featuring landscape. The composition should feel grand with soft natural light. Use cool blue-silver palette throughout. Every detail should be intentional — from the subject expression to the overall mood. The final result should look like a professional concept art piece.

Pro Tips

1Start with the default Size value and make small adjustments to understand how it affects your specific prompt style.
2Different styles respond differently to Size changes — what works for photorealistic may not work for anime or abstract.
3Keep notes on which Size values work best for your favorite prompt structures — this builds your personal GPT Image knowledge base.
4When sharing prompts, always include your Size setting — it can dramatically change results even with identical prompt text.
5For batch generation, lock your Size value to maintain consistency across an entire set of related images.

Common Mistakes

✕Using extreme Size values without understanding the trade-offs — moderate values usually produce the most balanced results.

✕Assuming the same Size value works for all styles — always test with your specific prompt before committing to a batch.

✕Changing Size and other settings simultaneously — adjust one parameter at a time to understand each one's effect.

Frequently Asked Questions

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