GPT Image 1.5vs.GLM-Image

Which one is better?

In our own test, GPT Image 1.5 leads. GLM-Image has no arena rating yet. GLM-Image has no API price.

Test images

Same task, the first image of each. The task with the biggest difference is preselected.

GPT Image 1.5: Product photography, first image from the fixed test run — GPT Image 1.552 out of 100

GLM-Image: Product photography, first image from the fixed test run — GLM-Image9 out of 100

Result for “Product photography”:GPT Image 1.5 ahead

Prompt given to both modelsCreate a square premium product photograph of a brushed titanium wristwatch standing upright on dark green marble. The watch has a cream dial, thin black hands set to 10:10, twelve distinct hour markers, a realistic crown, and a dark brown leather strap. Soft window light from the left, controlled reflections, shallow depth of field, no text, no logo, no extra objects.

What the rating looks at: Materials, reflections, and fine details.

“Ahead”: better in all three rating rounds. “Slightly ahead”: a higher value, but not in every round.

Test protocol of the images

Each test attempt uses the same archived prompt and one request. The first output of that attempt counts. Repeats after technical test failures are disclosed for the affected images. Files are normalized to 1,024 × 1,024 pixels without cropping. Provider resolution, randomness, quality tier and prompt processing can still differ. The images are a practical visual test, not a reconstruction of the arena configuration.

Character and detail

GPT Image 1.5: together, 1024x1024, n=1, seed=provider random, provider default steps, generated Aug 14, 2026, 12:17 PM. Source

GLM-Image: fal, image_size=square_hd; exact native pixels are not request-configurable, n=1, seed=794853230, prompt expansion disabled, Estimated charge reserves 2 MP at Fal's $0.05 per MP rate, estimated cost $0.100000, generated Nov 2, 2026, 3:01 PM. Source

Protocol gradually-image-comparison-v1. Prompt SHA 256: 985a75b38642a9f0e5e0c0e0c67f1b7f67780d42bd2168fa24e9a7a7a94b0da6

GPT Image 1.5 image SHA 256: 0dff52ccd39400ac66ac8870c9ea937512ff1474688e70118688f420c38c2296

GLM-Image image SHA 256: 3d4fb65e6b8d8aaa9baa9bed4cb79dabe2c672399f5c442c794eb641013686d3

Infographic

GPT Image 1.5: together, 1024x1024, n=1, seed=provider random, provider default steps, generated Aug 14, 2026, 12:17 PM. Source

GLM-Image: fal, image_size=square_hd; exact native pixels are not request-configurable, n=1, seed=1670252675, prompt expansion disabled, Estimated charge reserves 2 MP at Fal's $0.05 per MP rate, estimated cost $0.100000, generated Nov 2, 2026, 3:02 PM. Source

Protocol gradually-image-comparison-v1. Prompt SHA 256: ed65cb4e6a51e2336f8b149ad4cbb16e020f07d527ad94362e719d2dcf91d94f

GPT Image 1.5 image SHA 256: 1c9ff59c32621c8b48b002dacb0ae66487262280c7c0a5b3d6456c81b248ebe9

GLM-Image image SHA 256: 0218fb1367d7eed72594c72413f4bcbc5633b1ace0f4905414c4708c5b199af6

Product photography

GPT Image 1.5: together, 1024x1024, n=1, seed=provider random, provider default steps, generated Aug 14, 2026, 12:16 PM. Source

GLM-Image: fal, image_size=square_hd; exact native pixels are not request-configurable, n=1, seed=1515387045, prompt expansion disabled, Estimated charge reserves 2 MP at Fal's $0.05 per MP rate, estimated cost $0.100000, generated Nov 2, 2026, 3:00 PM. Source

Protocol gradually-image-comparison-v1. Prompt SHA 256: c67fd71e91304458a2feef5c91efa8677260fab0c0099a29a2c52cb579f5b2f3

GPT Image 1.5 image SHA 256: 67cfa2f324447027ceb5f82e9446d40a1395b46ce425890a74606b4d97731cf6

GLM-Image image SHA 256: b5221e770227cfb755aeb6766a4a709b6936e0e0314a0bcbfbcc34db9face315

Typography and layout

GPT Image 1.5: together, 1024x1024, n=1, seed=provider random, provider default steps, generated Aug 14, 2026, 1:59 PM. Source

GLM-Image: fal, image_size=square_hd; exact native pixels are not request-configurable, n=1, seed=2105445743, prompt expansion disabled, Estimated charge reserves 2 MP at Fal's $0.05 per MP rate, estimated cost $0.100000, generated Nov 2, 2026, 2:59 PM. Source

Protocol gradually-image-comparison-v1. Prompt SHA 256: 2e012c3d14ee5dd02203a94f394ca80a5038cdebd6032b25a8b8a221f2255419

GPT Image 1.5 image SHA 256: 6a4cec86850fd371b65274198e2bf630b3cf36a096f9fb953d4bfe17c3222ebe

GLM-Image image SHA 256: db901c11b4dddacb75b2743d56955ee15cbea541c0924d3c6d8530e91042c815

The numbers at a glance

Arena ratingfrom votes by users · higher is better

1,236

GPT Image 1.5

Rank 13 of 21

n/a

GLM-Image

not in the arena

GraduallyBenchour own rating, 0 to 100 · higher is better

GPT Image 1.5

Rank 29 of 108

GLM-Image

Rank 75 of 108

Price per imagedollars through the API · lower is better

$0.13

GPT Image 1.5

expensive

n/a

GLM-Image

no API price

Ranks among the 21 image models with an arena rating and the 108 with a GraduallyBench run; prices compared with 28 models with an API price.

GPT Image 1.5

Subscription: No OpenAI subscription includes this model. Through other providers from ≈ €6.36 a month (ElevenLabs Starter, with limited credits). 42 plans in Germany.
Via API: $0.13 per image, 100 images $13.30.

GLM-Image

Subscription: n/a No plan in Germany names exactly this model.
Via API: No API price known. Access: API, local.
License: Open weights.

Subscriptions only count plans that name exactly this model. Subscription prices include VAT, API prices are in dollars.

Arena rating (LMArena) from Nov 6, 2026 · GraduallyBench from Nov 3, 2026 · API prices from Nov 6, 2026 · Subscription database from Sep 29, 2026 (38 days old)

All data side by side

The better value is bold. For ratings only when the gap is clear.

Kennzahl	GPT Image 1.5	GLM-Image
Ratings
Arena ratingfrom votes by users, higher is better	1,236	n/a
Arena rank	Rank 13 of 21	n/a
Arena votesmore votes, a safer rating	173,798	n/a
GraduallyBenchour own rating, 0 to 100	68	35
GraduallyBench by task
Typography and layoutLegible text, hierarchy, and composition	60	50
Product photographyMaterials, reflections, and fine details	52	9
Character and detailAnatomy, clothing, and spatial consistency	89	51
InfographicNumbers, labels, and visual organization	72	30
API price
Per imagelower is better	$0.13	n/a
100 images	$13.30	n/a
Profile
Released	December 2025	n/a
Weightsopen means: runs locally	proprietary	open
Lifecycle	Marked as deprecated by OpenAI; removed from the API on December 1, 2026	no notice
Access	API, Web app	API, local
Parameters	not published	not published
Largest output	1,536 × 1,024 pixels	2K
Plans in Germanynaming exactly this model	42	n/a

API prices for one image at 1,024 × 1,024 pixels according to Artificial Analysis.

Sources: GPT Image 1.5 model source, status source (verified Aug 15, 2026) · GLM-Image model source (verified Nov 1, 2026)

Arena ratings by category

From blind votes on LMArena. “Ahead” means the lead is clear.

No shared arena score in the stored snapshot

The stored benchmark database contains no measurement for GPT Image 1.5 and GLM-Image from the same arena and category. Older model versions are not used as substitutes.

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