Best image model · YouTube thumbnails
The best AI image generator for YouTube thumbnails: 7 models, tested
All 7 image models in llmwise on the same 2 thumbnail prompts: every image as it was made, what the checks found in it, and what an image of each costs.
Based on 14 images made on September 29, 2026 through kie.ai with llmwise's own settings for each model, each checked by Claude Sonnet 5.5. How the images are checked.
Short answer
On our 2 thumbnail prompts, run on all 7 image models in llmwise and checked the same way, FLUX.2 Pro, Seedream 5.0 Lite, and Ideogram 3.0 tied for first, each passing 2 of 2. 3 of 7 passed every prompt; each image is below, with what the checks found.
Every image model on YouTube thumbnails, ranked
Ranked by prompts passed, then by checks right (each question answered yes, each piece of writing read back), then by what an image counts as in llmwise.
| Model | Passed | Checks right | An image counts as | Time an image |
|---|---|---|---|---|
| FLUX.2 Pro | 2 of 2 | 12 of 12 | 2 Claude Haiku 4.5 messages | 42.1 s |
| Seedream 5.0 Lite | 2 of 2 | 12 of 12 | 2 Claude Haiku 4.5 messages | 50.9 s |
| Ideogram 3.0 | 2 of 2 | 12 of 12 | 2 Claude Haiku 4.5 messages | 94.1 s |
| Qwen-Image 2.1 | 1 of 2 | 11 of 12 | 1 Claude Haiku 4.5 message | 39.5 s |
| GPT Image 2.5 Flare | 1 of 2 | 11 of 12 | 2 Claude Haiku 4.5 messages | 61.1 s |
| Nano Banana 2 | 1 of 2 | 11 of 12 | 2 Claude Haiku 4.5 messages | 102.5 s |
| Nano Banana Pro | 1 of 2 | 11 of 12 | 5 Claude Haiku 4.5 messages | 29.5 s |
A cooking video thumbnail
Every model's image for this everyday landscape prompt, and what the checks found.
A YouTube thumbnail for a cooking video: a surprised chef on the left holding a pan with flames coming out of it, and the words "5 MINUTE DINNER" in huge bold letters on the right. Bright, high-contrast colours.
The writing it must carry, read back exactly (case and punctuation aside): “5 MINUTE DINNER”.
The questions, each answered yes or no from the image alone:
- Is there a person dressed as a chef?
- Is the person on the left side?
- Are there flames coming from the pan?
- Is the big writing on the right side?
- Is the writing big enough to read when the image is small?
Read in it: “5”, “MINUTE”, “DINNER”.
- Yes: A woman wears a white chef's hat, white chef jacket and black apron.
- Yes: The chef is positioned on the left side of the image.
- Yes: Large flames rise from the food in the frying pan.
- Yes: The large text '5 MINUTE DINNER' fills the right side of the image.
- Yes: The text is huge, bold, and high-contrast in yellow and white against red and black, so it stays readable when small.
$0.030 at kie.ai, 66.3 s, 1536 × 1024.
Read in it: “18:02”, “CHEF ALEX”, “5 MINUTE”, “DINNER”, “READY! SET! GO!”.
- Yes: A man wears a white chef's jacket and a dark apron with a 'Chef Alex' badge.
- Yes: The man stands on the left side of the image.
- Yes: Large flames rise from the frying pan he holds.
- Yes: The large '5 MINUTE DINNER' title fills the right side of the image.
- Yes: The title letters are very large, bold and high-contrast, so they stay legible at a small size.
$0.040 at kie.ai, 15.5 s, 1264 × 848.
Read in it: “5”, “MINUTE”, “DINNER”.
- Yes: A man wears a white chef's hat and white double-breasted chef's jacket with an apron.
- Yes: The chef is at the left edge of the image.
- Yes: Large flames rise from the pan he is holding.
- Yes: The large text '5 MINUTE DINNER' fills the right side of the image.
- Yes: The text is very large, bold, and high-contrast with outlines, so it stays legible when small.
$0.090 at kie.ai, 28.3 s, 2528 × 1696.
Read in it: “5 MINUTE”, “DINNER”.
- Yes: The man wears a white chef's hat and white chef's jacket.
- Yes: The chef is positioned on the left side of the image.
- Yes: Large flames rise from the black frying pan he is holding.
- Yes: The large yellow text "5 MINUTE DINNER" occupies the right side of the image.
- Yes: The text is very large, bold yellow with a thick black outline, so it stays legible at small sizes.
$0.028 at kie.ai, 61.1 s, 2352 × 1568.
Read in it: “5 MINUTE”, “DINNER”.
- Yes: A man wears a white chef's hat and white chef's jacket in a kitchen.
- Yes: The chef occupies the left portion of the image.
- Yes: Large flames rise from the pan he is holding.
- Yes: The large yellow text '5 MINUTE DINNER' is on the right side on a teal background.
- Yes: The text is very large, bold yellow with a dark outline on a dark background, so it stays readable when small.
$0.025 at kie.ai, 61.1 s, 1536 × 1024.
Read in it: “5 MINUTE”, “DINNER”.
- Yes: The man wears a white double-breasted chef's jacket and holds a pan.
- Yes: The chef is positioned in the left portion of the image.
- Yes: Orange flames rise from the black skillet he is holding.
- Yes: The large text "5 MINUTE DINNER" sits on the right side next to the chef.
- Yes: The text is large, bold, white with a dark shadow on red, so it stays legible at small sizes.
$0.035 at kie.ai, 124.6 s, 1152 × 864.
Failed: question 3 answered no.
Read in it: “5 MINUTE”, “DINNER”.
- Yes: The man wears a white double-breasted chef's jacket with a black neckerchief.
- Yes: The man is positioned in the left half of the image.
- No: The flames are on the far left beside the man, not coming from the pan, which only holds food and flying bits.
- Yes: The large text "5 MINUTE DINNER" fills the right side of the image.
- Yes: The text is very large, bold, and high-contrast yellow and white on a dark background, so it stays readable when small.
$0.020 at kie.ai, 43.4 s, 1248 × 832.
A phone review thumbnail with a question
Every model's image for this hard landscape prompt, and what the checks found.
A YouTube thumbnail for a phone review: a smartphone on the right, and the words "WORTH IT?" in huge yellow letters with a black outline on the left, on a dark blue background. Nothing else is written.
The writing it must carry, read back exactly (case and punctuation aside): “WORTH IT?”.
The questions, each answered yes or no from the image alone:
- Is there a smartphone on the right side?
- Is the writing on the left side?
- Are the letters yellow with a black outline?
- Is the background dark blue?
- Is there only one piece of writing?
Failed: question 5 answered no.
Read in it: “WORTH”, “IT?”.
- Yes: Two smartphones (back and front views) are on the right side.
- Yes: The words 'WORTH IT?' are on the left side of the image.
- Yes: The letters are bright yellow with a thick black outline.
- Yes: The background is a deep, dark blue.
- No: The writing is on two separate lines, 'WORTH' and 'IT?', although they form one phrase.
$0.030 at kie.ai, 55.9 s, 1536 × 1024.
Failed: question 5 answered no.
Read in it: “WORTH”, “IT?”, “YouTube”, “Foto”, “Settings”, “Camera”.
- Yes: Two smartphones (front and back view) are shown on the right side.
- Yes: The large text 'WORTH IT?' is positioned on the left side of the image.
- Yes: The large letters are bright yellow with a thick black outline.
- Yes: The background is a dark blue gradient.
- No: Besides the large 'WORTH IT?' text, there are small app labels on the phone screen such as YouTube, Foto, Settings and Camera.
$0.040 at kie.ai, 189.4 s, 1264 × 848.
Failed: question 5 answered no.
Read in it: “WORTH”, “IT?”, “HDR”, “12”, “4K”, “20-MO”, “VIDEO”, “PHOTO”, “FORTAMT”, “PANO”.
- Yes: A hand holds a smartphone showing a camera app on the right side of the image.
- Yes: The large text "WORTH IT?" is on the left side of the image.
- Yes: The large letters are bright yellow with a thick black outline.
- Yes: The background is a dark blue with a circuit-like pattern.
- No: Besides the large "WORTH IT?", the phone screen shows several small labels such as HDR, 4K, VIDEO and PHOTO.
$0.090 at kie.ai, 30.7 s, 2528 × 1696.
Read in it: “WORTH”, “IT?”.
- Yes: A smartphone with a light blue screen and a front camera cutout is on the right side.
- Yes: The words 'WORTH IT?' are on the left side of the image.
- Yes: The letters are bright yellow with a dark outline around them.
- Yes: The background is a dark navy blue.
- Yes: The only writing is the phrase 'WORTH IT?', which is one block of text even though it spans two lines.
$0.028 at kie.ai, 40.7 s, 2496 × 1664.
Read in it: “WORTH”, “IT?”.
- Yes: A tilted smartphone with a notch and a bright wallpaper appears on the right side of the image.
- Yes: The words 'WORTH IT?' are on the left side of the image.
- Yes: The letters are bright yellow with a thick black outline.
- Yes: The background is a dark navy blue gradient.
- Yes: The only writing is the phrase 'WORTH IT?', which is one text block across two lines.
$0.025 at kie.ai, 23.0 s, 1536 × 1024.
Read in it: “WORTH IT?”.
- Yes: A smartphone with a teal-gray screen is tilted on the right side of the image.
- Yes: The text 'WORTH IT?' sits on the left and center-left of the image.
- Yes: The letters are bright yellow with a dark black outline.
- Yes: The whole background is a dark navy blue.
- Yes: The only writing in the image is 'WORTH IT?'.
$0.035 at kie.ai, 63.6 s, 1152 × 864.
Read in it: “WORTH”, “IT?”.
- Yes: A black smartphone with a triple camera is shown on the right side of the image.
- Yes: The words 'WORTH IT?' are positioned on the left side.
- Yes: The letters are bright yellow with a thick black outline.
- Yes: The background is a dark navy blue gradient.
- Yes: The only writing is the phrase 'WORTH IT?', which forms one piece of text across two lines.
$0.020 at kie.ai, 35.7 s, 1248 × 832.
More image tests
Questions
What's the best AI image generator for YouTube thumbnails?
On our 2 thumbnail prompts, run on all 7 image models in llmwise and checked the same way, FLUX.2 Pro, Seedream 5.0 Lite, and Ideogram 3.0 tied for first, each passing 2 of 2. 3 of 7 passed every prompt; each image is below, with what the checks found.
How are the images checked?
Every image is checked the same way by Claude Sonnet 5.5, whose maker has no image model here: it first writes out all the writing it can read, without being told what should be there, then answers each question yes or no from the image. An image passes when all its writing is there and every answer is yes. Nothing else is judged.
Claude, GPT, Gemini, DeepSeek, Grok, Kimi, and GLM, in one chat.
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