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Image models compared

Nano Banana 2 vs Seedream 5.0 Lite: the same prompts, side by side

Google's Nano Banana 2 and ByteDance's Seedream 5.0 Lite on the same 16 prompts, two for each of 8 jobs, from logos to YouTube thumbnails: each image as it was made, what the checks found, what it cost and how long it took.

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Based on 32 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 16 image test prompts, Nano Banana 2 and Seedream 5.0 Lite each passed 14, each image checked the same way. Seedream 5.0 Lite was quicker, 47.0 s an image against 88.0 s. In llmwise an image from either counts as 2 Claude Haiku 4.5 messages, up to 125 images a month on Pro.

Nano Banana 2 and Seedream 5.0 Lite in llmwise

What llmwise asks Nano Banana 2 and Seedream 5.0 Lite for, and what an image of each counts as.

Nano Banana 2 and Seedream 5.0 Lite in llmwise
FactNano Banana 2Seedream 5.0 Lite
Made byGoogleByteDance
Made throughkie.aikie.ai
Output size1K2K
Aspect ratiossquare 1:1, portrait 2:3, landscape 3:2square 1:1, portrait 2:3, landscape 3:2
An image counts as2 Claude Haiku 4.5 messages2 Claude Haiku 4.5 messages
Images on Proup to 125 a monthup to 125 a month

Job by job

Nano Banana 2 passed 14 of 16 and Seedream 5.0 Lite 14 of 16. A prompt passes when every piece of writing it asked for is there and every question about the image is a yes.

Nano Banana 2 and Seedream 5.0 Lite, job by job
JobNano Banana 2Seedream 5.0 Lite
Logos2 of 2 passed, 12 of 12 checks2 of 2 passed, 12 of 12 checks
Text in images2 of 2 passed, 14 of 14 checks2 of 2 passed, 14 of 14 checks
Product photos2 of 2 passed, 12 of 12 checks2 of 2 passed, 12 of 12 checks
Photorealistic images2 of 2 passed, 11 of 11 checks2 of 2 passed, 11 of 11 checks
Illustrations2 of 2 passed, 10 of 10 checks2 of 2 passed, 10 of 10 checks
Portraits2 of 2 passed, 13 of 13 checks1 of 2 passed, 12 of 13 checks
YouTube thumbnails1 of 2 passed, 11 of 12 checks2 of 2 passed, 12 of 12 checks
Social media posts1 of 2 passed, 10 of 12 checks1 of 2 passed, 11 of 12 checks

The same prompts, side by side

Nano Banana 2's and Seedream 5.0 Lite's image for each prompt, with each question either one was answered no on; a prompt's title links to it in full, with every answer.

  1. A coffee shop logo with its name

    Both Nano Banana 2 and Seedream 5.0 Lite passed; Seedream 5.0 Lite's image came 2.5 s sooner (46.2 s to 48.6 s), and Seedream 5.0 Lite's cost $0.013 less at kie.ai.

    Nano Banana 2Passed
    Nano Banana 2's image for “A coffee shop logo with its name”
      Seedream 5.0 LitePassed
      Seedream 5.0 Lite's image for “A coffee shop logo with its name”

      • A wheel and a wrench in one icon

        Both Nano Banana 2 and Seedream 5.0 Lite passed; Seedream 5.0 Lite's image came 76.0 s sooner (43.4 s to 119.5 s), and Seedream 5.0 Lite's cost $0.013 less at kie.ai.

        Nano Banana 2Passed
        Nano Banana 2's image for “A wheel and a wrench in one icon”
          Seedream 5.0 LitePassed
          Seedream 5.0 Lite's image for “A wheel and a wrench in one icon”

          • A bakery sign with two lines

            Both Nano Banana 2 and Seedream 5.0 Lite passed; Seedream 5.0 Lite's image came 4.8 s sooner (43.7 s to 48.6 s), and Seedream 5.0 Lite's cost $0.013 less at kie.ai.

            Nano Banana 2Passed
            Nano Banana 2's image for “A bakery sign with two lines”
              Seedream 5.0 LitePassed
              Seedream 5.0 Lite's image for “A bakery sign with two lines”

              • A café menu board with four prices

                Both Nano Banana 2 and Seedream 5.0 Lite passed; Nano Banana 2's image came 30.5 s sooner (44.1 s to 74.6 s), and Seedream 5.0 Lite's cost $0.013 less at kie.ai.

                Nano Banana 2Passed
                Nano Banana 2's image for “A café menu board with four prices”
                  Seedream 5.0 LitePassed
                  Seedream 5.0 Lite's image for “A café menu board with four prices”

                  • A white sneaker on a grey background

                    Both Nano Banana 2 and Seedream 5.0 Lite passed; Seedream 5.0 Lite's image came 2.5 s sooner (41.2 s to 43.8 s), and Seedream 5.0 Lite's cost $0.013 less at kie.ai.

                    Nano Banana 2Passed
                    Nano Banana 2's image for “A white sneaker on a grey background”
                      Seedream 5.0 LitePassed
                      Seedream 5.0 Lite's image for “A white sneaker on a grey background”

                      • A perfume bottle and its reflection

                        Both Nano Banana 2 and Seedream 5.0 Lite passed; Seedream 5.0 Lite's image came 2.8 s sooner (41.8 s to 44.6 s), and Seedream 5.0 Lite's cost $0.013 less at kie.ai.

                        Nano Banana 2Passed
                        Nano Banana 2's image for “A perfume bottle and its reflection”
                          Seedream 5.0 LitePassed
                          Seedream 5.0 Lite's image for “A perfume bottle and its reflection”

                          • A bowl of ramen from above

                            Both Nano Banana 2 and Seedream 5.0 Lite passed; Seedream 5.0 Lite's image came 106.5 s sooner (46.6 s to 153.1 s), and Seedream 5.0 Lite's cost $0.013 less at kie.ai.

                            Nano Banana 2Passed
                            Nano Banana 2's image for “A bowl of ramen from above”
                              Seedream 5.0 LitePassed
                              Seedream 5.0 Lite's image for “A bowl of ramen from above”

                              • A rainy street at night, one red umbrella

                                Both Nano Banana 2 and Seedream 5.0 Lite passed; Seedream 5.0 Lite's image came 106.9 s sooner (37.2 s to 144.1 s), and Seedream 5.0 Lite's cost $0.013 less at kie.ai.

                                Nano Banana 2Passed
                                Nano Banana 2's image for “A rainy street at night, one red umbrella”
                                  Seedream 5.0 LitePassed
                                  Seedream 5.0 Lite's image for “A rainy street at night, one red umbrella”

                                  • A watercolour fox for a children's book

                                    Both Nano Banana 2 and Seedream 5.0 Lite passed; Nano Banana 2's image came 10.2 s sooner (47.2 s to 57.4 s), and Seedream 5.0 Lite's cost $0.013 less at kie.ai.

                                    Nano Banana 2Passed
                                    Nano Banana 2's image for “A watercolour fox for a children's book”
                                      Seedream 5.0 LitePassed
                                      Seedream 5.0 Lite's image for “A watercolour fox for a children's book”

                                      • Three people at one laptop, flat vector

                                        Both Nano Banana 2 and Seedream 5.0 Lite passed; Seedream 5.0 Lite's image came 145.2 s sooner (38.4 s to 183.6 s), and Seedream 5.0 Lite's cost $0.013 less at kie.ai.

                                        Nano Banana 2Passed
                                        Nano Banana 2's image for “Three people at one laptop, flat vector”
                                          Seedream 5.0 LitePassed
                                          Seedream 5.0 Lite's image for “Three people at one laptop, flat vector”

                                          • A studio headshot

                                            Both Nano Banana 2 and Seedream 5.0 Lite passed; Seedream 5.0 Lite's image came 25.8 s sooner (40.7 s to 66.5 s), and Seedream 5.0 Lite's cost $0.013 less at kie.ai.

                                            Nano Banana 2Passed
                                            Nano Banana 2's image for “A studio headshot”
                                              Seedream 5.0 LitePassed
                                              Seedream 5.0 Lite's image for “A studio headshot”

                                              • A fisherman holding a rope in both hands

                                                Only Nano Banana 2 passed, not Seedream 5.0 Lite; Seedream 5.0 Lite's image came 63.7 s sooner (53.5 s to 117.2 s), and Seedream 5.0 Lite's cost $0.013 less at kie.ai.

                                                Nano Banana 2Passed
                                                Nano Banana 2's image for “A fisherman holding a rope in both hands”
                                                  Seedream 5.0 LiteFailed
                                                  Seedream 5.0 Lite's image for “A fisherman holding a rope in both hands”
                                                  • Does every hand you can see have five fingers and look natural? No: The fingers are mostly hidden or wrapped around the rope, so five fingers on each hand cannot be confirmed.

                                                • A cooking video thumbnail

                                                  Both Nano Banana 2 and Seedream 5.0 Lite passed; Nano Banana 2's image came 45.5 s sooner (15.5 s to 61.1 s), and Seedream 5.0 Lite's cost $0.013 less at kie.ai.

                                                  Nano Banana 2Passed
                                                  Nano Banana 2's image for “A cooking video thumbnail”
                                                    Seedream 5.0 LitePassed
                                                    Seedream 5.0 Lite's image for “A cooking video thumbnail”

                                                    • A phone review thumbnail with a question

                                                      Only Seedream 5.0 Lite passed, not Nano Banana 2; Seedream 5.0 Lite's image came 148.7 s sooner (40.7 s to 189.4 s), and Seedream 5.0 Lite's cost $0.013 less at kie.ai.

                                                      Nano Banana 2Failed
                                                      Nano Banana 2's image for “A phone review thumbnail with a question”
                                                      • Is there only one piece of writing? No: Besides the large 'WORTH IT?' text, there are small app labels on the phone screen such as YouTube, Foto, Settings and Camera.
                                                      Seedream 5.0 LitePassed
                                                      Seedream 5.0 Lite's image for “A phone review thumbnail with a question”

                                                      • A summer sale post

                                                        Both Nano Banana 2 and Seedream 5.0 Lite passed; Seedream 5.0 Lite's image came 10.1 s sooner (45.9 s to 56.0 s), and Seedream 5.0 Lite's cost $0.013 less at kie.ai.

                                                        Nano Banana 2Passed
                                                        Nano Banana 2's image for “A summer sale post”
                                                          Seedream 5.0 LitePassed
                                                          Seedream 5.0 Lite's image for “A summer sale post”

                                                          • A book club announcement, top and bottom

                                                            Neither Nano Banana 2 nor Seedream 5.0 Lite passed; Seedream 5.0 Lite's image came 46.7 s sooner (38.8 s to 85.5 s), and Seedream 5.0 Lite's cost $0.013 less at kie.ai.

                                                            Nano Banana 2Failed
                                                            Nano Banana 2's image for “A book club announcement, top and bottom”
                                                            • Is there one line of writing at the top and one at the bottom? No: The top has two lines, 'BOOK' and 'CLUB', not one, and the bottom has one line, 'THURSDAY 7PM'.
                                                            • Apart from those two lines, is nothing else written? No: The book pages have tiny text and the tea bag tag has small writing, so there is more writing than the headline and the bottom line.
                                                            Seedream 5.0 LiteFailed
                                                            Seedream 5.0 Lite's image for “A book club announcement, top and bottom”
                                                            • Apart from those two lines, is nothing else written? No: The book's pages show tiny, unreadable text-like marks, so the image contains more than those two lines.

                                                          More image models, compared

                                                          Questions

                                                          Is Nano Banana 2 better than Seedream 5.0 Lite?

                                                          On our 16 image test prompts, Nano Banana 2 and Seedream 5.0 Lite each passed 14, each image checked the same way. Seedream 5.0 Lite was quicker, 47.0 s an image against 88.0 s. In llmwise an image from either counts as 2 Claude Haiku 4.5 messages, up to 125 images a month on Pro.

                                                          Which is cheaper in llmwise, Nano Banana 2 or Seedream 5.0 Lite?

                                                          Neither: in llmwise an image from either counts as 2 Claude Haiku 4.5 messages.

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