ZMIME
Image model comparison · 2 models · Updated Nov 2, 2026

GLM-Image vs GPT Image 1.5

Preferred for text to image: GPT Image 1.5 · Newest: GLM-Image · Self-hosting: GLM-Image. Quality scores are blind human-preference votes; specs and prices come from each lab’s listings.

  1. Z.ai (Zhipu)

    GLM-Image

    Released Jan 14, 2026

    • Text to image
    • Image editing
    • Arena1,012
    • From—
    • Max size—
    Full specs Remove GLM-Image

  2. OpenAI

    GPT Image 1.5

    Released Nov 25, 2025Deprecated

    • Text to image
    • Image editing
    • Arena1,368
    • From—
    • Max size—
    Full specs Remove GPT Image 1.5

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01 — At a glance

Where they differ

Quality is the arena score from blind, side-by-side human votes. Price, length and resolution come from each lab’s own listings.

  • Preferred for text to imageGPT Image 1.5GLM-Image 1,012 (#76) · GPT Image 1.5 1,236 (#17) — blind human votes
  • NewestGLM-ImageGLM-Image Jan 14, 2026 · GPT Image 1.5 Nov 25, 2025
  • Widest inputsSame inputsGLM-Image: Text prompts, Reference images · GPT Image 1.5: Text prompts, Reference images
  • Image editingBoth edit imagesTakes a reference image as input: GLM-Image yes · GPT Image 1.5 yes
  • Self-hostingGLM-ImageDownloadable weights (MIT)
  • Most API hostsGPT Image 1.5GLM-Image: 1 · GPT Image 1.5: 7
02 — Side by side

Every spec in one table

Dashes mean the data is not published.

GLM-Image vs GPT Image 1.5 specifications side by side
SpecificationGLM-ImageZ.ai (Zhipu)GPT Image 1.5OpenAI
Quality (blind human votes)
Text to image arenaElo-style score · higher is better1,012 ±9#76 of 82 · 4,854 votes1,236 ±3#17 of 82 · 174,012 votes (best)
Image editing arenaElo-style score · higher is better—1,368 ±3#19 of 61 · 684,650 votes
Output
ProducesImagesImages
Inputs
Text promptsYesYes
Reference images (editing)YesYes
Access
WeightsOpenMITProprietary
API model ID—gpt-image-1.5
API hosts17 (best)
ReleasedJan 14, 2026Nov 25, 2025
03 — Questions

Which should you choose?

Which is better, GLM-Image or GPT Image 1.5?

For text to image, voters prefer GPT Image 1.5 (GLM-Image 1,012 (#76) · GPT Image 1.5 1,236 (#17)). Arena scores come from blind, side-by-side human votes on the same prompts; when the gap is inside both models’ error margins we call it a tie. Test your own prompts before you commit.

What is the difference between GLM-Image and GPT Image 1.5?

GLM-Image is an image model from Z.ai (Zhipu) (Jan 14, 2026), taking text prompts and reference images and producing images. GPT Image 1.5 is an image model from OpenAI (Nov 25, 2025), taking text prompts and reference images and producing images.

Which is newer?

GLM-Image Jan 14, 2026; GPT Image 1.5 Nov 25, 2025.

Which can edit an existing image?

Takes a reference image as input: GLM-Image yes; GPT Image 1.5 yes.

Can I run any of these on my own hardware?

GLM-Image. Downloadable weights (MIT).

04 — Keep comparing

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