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Image models compared

FLUX.2 Pro vs Nano Banana Pro: the same prompts, side by side

Black Forest Labs' FLUX.2 Pro and Google's Nano Banana Pro 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, FLUX.2 Pro passed 14 and Nano Banana Pro 13, each image checked the same way. Nano Banana Pro was quicker, 36.2 s an image against 60.7 s. In llmwise a FLUX.2 Pro image counts as 2 Claude Haiku 4.5 messages and a Nano Banana Pro image as 5 Claude Haiku 4.5 messages: up to 125 and 50 images a month on Pro.

FLUX.2 Pro and Nano Banana Pro in llmwise

What llmwise asks FLUX.2 Pro and Nano Banana Pro for, and what an image of each counts as.

FLUX.2 Pro and Nano Banana Pro in llmwise
FactFLUX.2 ProNano Banana Pro
Made byBlack Forest LabsGoogle
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 messages5 Claude Haiku 4.5 messages
Images on Proup to 125 a monthup to 50 a month

Job by job

FLUX.2 Pro passed 14 of 16 and Nano Banana Pro 13 of 16. A prompt passes when every piece of writing it asked for is there and every question about the image is a yes.

FLUX.2 Pro and Nano Banana Pro, job by job
JobFLUX.2 ProNano Banana Pro
Logos2 of 2 passed, 12 of 12 checks2 of 2 passed, 12 of 12 checks
Text in images2 of 2 passed, 14 of 14 checks1 of 2 passed, 13 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 checks1 of 2 passed, 10 of 11 checks
Illustrations2 of 2 passed, 10 of 10 checks2 of 2 passed, 10 of 10 checks
Portraits1 of 2 passed, 12 of 13 checks2 of 2 passed, 13 of 13 checks
YouTube thumbnails2 of 2 passed, 12 of 12 checks1 of 2 passed, 11 of 12 checks
Social media posts1 of 2 passed, 11 of 12 checks2 of 2 passed, 12 of 12 checks

The same prompts, side by side

FLUX.2 Pro's and Nano Banana Pro'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 FLUX.2 Pro and Nano Banana Pro passed; Nano Banana Pro's image came 22.5 s sooner (38.6 s to 61.1 s), and FLUX.2 Pro's cost $0.065 less at kie.ai.

    FLUX.2 ProPassed
    FLUX.2 Pro's image for “A coffee shop logo with its name”
      Nano Banana ProPassed
      Nano Banana Pro's image for “A coffee shop logo with its name”

      • A wheel and a wrench in one icon

        Both FLUX.2 Pro and Nano Banana Pro passed; Nano Banana Pro's image came 10.2 s sooner (38.5 s to 48.6 s), and FLUX.2 Pro's cost $0.065 less at kie.ai.

        FLUX.2 ProPassed
        FLUX.2 Pro's image for “A wheel and a wrench in one icon”
          Nano Banana ProPassed
          Nano Banana Pro's image for “A wheel and a wrench in one icon”

          • A bakery sign with two lines

            Only FLUX.2 Pro passed, not Nano Banana Pro; FLUX.2 Pro's image came 13.0 s sooner (18.0 s to 31.0 s), and FLUX.2 Pro's cost $0.065 less at kie.ai.

            FLUX.2 ProPassed
            FLUX.2 Pro's image for “A bakery sign with two lines”
              Nano Banana ProFailed
              Nano Banana Pro's image for “A bakery sign with two lines”
              • Is the writing on the sign in two lines, one above the other? No: The writing is in four lines (FRESH, BREAD, DAILY, OPEN 7AM), not two.

            • A café menu board with four prices

              Both FLUX.2 Pro and Nano Banana Pro passed; FLUX.2 Pro's image came 13.4 s sooner (18.2 s to 31.6 s), and FLUX.2 Pro's cost $0.065 less at kie.ai.

              FLUX.2 ProPassed
              FLUX.2 Pro's image for “A café menu board with four prices”
                Nano Banana ProPassed
                Nano Banana Pro's image for “A café menu board with four prices”

                • A white sneaker on a grey background

                  Both FLUX.2 Pro and Nano Banana Pro passed; FLUX.2 Pro's image came 21.3 s sooner (23.2 s to 44.4 s), and FLUX.2 Pro's cost $0.065 less at kie.ai.

                  FLUX.2 ProPassed
                  FLUX.2 Pro's image for “A white sneaker on a grey background”
                    Nano Banana ProPassed
                    Nano Banana Pro's image for “A white sneaker on a grey background”

                    • A perfume bottle and its reflection

                      Both FLUX.2 Pro and Nano Banana Pro passed; FLUX.2 Pro's image came 12.9 s sooner (23.4 s to 36.4 s), and FLUX.2 Pro's cost $0.065 less at kie.ai.

                      FLUX.2 ProPassed
                      FLUX.2 Pro's image for “A perfume bottle and its reflection”
                        Nano Banana ProPassed
                        Nano Banana Pro's image for “A perfume bottle and its reflection”

                        • A bowl of ramen from above

                          Both FLUX.2 Pro and Nano Banana Pro passed; Nano Banana Pro's image came 21.1 s sooner (44.1 s to 65.1 s), and FLUX.2 Pro's cost $0.065 less at kie.ai.

                          FLUX.2 ProPassed
                          FLUX.2 Pro's image for “A bowl of ramen from above”
                            Nano Banana ProPassed
                            Nano Banana Pro's image for “A bowl of ramen from above”

                            • A rainy street at night, one red umbrella

                              Only FLUX.2 Pro passed, not Nano Banana Pro; FLUX.2 Pro's image came 12.9 s sooner (18.4 s to 31.3 s), and FLUX.2 Pro's cost $0.065 less at kie.ai.

                              FLUX.2 ProPassed
                              FLUX.2 Pro's image for “A rainy street at night, one red umbrella”
                                Nano Banana ProFailed
                                Nano Banana Pro's image for “A rainy street at night, one red umbrella”
                                • Is it night? No: The sky is overcast and light, so it looks like daytime or dusk with neon signs lit, not full night.

                              • A watercolour fox for a children's book

                                Both FLUX.2 Pro and Nano Banana Pro passed; Nano Banana Pro's image came 43.2 s sooner (47.3 s to 90.5 s), and FLUX.2 Pro's cost $0.065 less at kie.ai.

                                FLUX.2 ProPassed
                                FLUX.2 Pro's image for “A watercolour fox for a children's book”
                                  Nano Banana ProPassed
                                  Nano Banana Pro's image for “A watercolour fox for a children's book”

                                  • Three people at one laptop, flat vector

                                    Both FLUX.2 Pro and Nano Banana Pro passed; Nano Banana Pro's image came 88.9 s sooner (30.7 s to 119.6 s), and FLUX.2 Pro's cost $0.065 less at kie.ai.

                                    FLUX.2 ProPassed
                                    FLUX.2 Pro's image for “Three people at one laptop, flat vector”
                                      Nano Banana ProPassed
                                      Nano Banana Pro's image for “Three people at one laptop, flat vector”

                                      • A studio headshot

                                        Both FLUX.2 Pro and Nano Banana Pro passed; FLUX.2 Pro's image came 7.7 s sooner (20.4 s to 28.1 s), and FLUX.2 Pro's cost $0.065 less at kie.ai.

                                        FLUX.2 ProPassed
                                        FLUX.2 Pro's image for “A studio headshot”
                                          Nano Banana ProPassed
                                          Nano Banana Pro's image for “A studio headshot”

                                          • A fisherman holding a rope in both hands

                                            Only Nano Banana Pro passed, not FLUX.2 Pro; FLUX.2 Pro's image came 2.7 s sooner (30.7 s to 33.4 s), and FLUX.2 Pro's cost $0.065 less at kie.ai.

                                            FLUX.2 ProFailed
                                            FLUX.2 Pro'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 hands are clasped and partly hidden by the rope, so the fingers are hard to count and some look slightly merged or unclear.
                                            Nano Banana ProPassed
                                            Nano Banana Pro's image for “A fisherman holding a rope in both hands”

                                            • A cooking video thumbnail

                                              Both FLUX.2 Pro and Nano Banana Pro passed; Nano Banana Pro's image came 32.8 s sooner (28.3 s to 61.1 s), and FLUX.2 Pro's cost $0.065 less at kie.ai.

                                              FLUX.2 ProPassed
                                              FLUX.2 Pro's image for “A cooking video thumbnail”
                                                Nano Banana ProPassed
                                                Nano Banana Pro's image for “A cooking video thumbnail”

                                                • A phone review thumbnail with a question

                                                  Only FLUX.2 Pro passed, not Nano Banana Pro; FLUX.2 Pro's image came 7.7 s sooner (23.0 s to 30.7 s), and FLUX.2 Pro's cost $0.065 less at kie.ai.

                                                  FLUX.2 ProPassed
                                                  FLUX.2 Pro's image for “A phone review thumbnail with a question”
                                                    Nano Banana ProFailed
                                                    Nano Banana Pro's image for “A phone review thumbnail with a question”
                                                    • Is there only one piece of writing? No: Besides the large "WORTH IT?", the phone screen shows several small labels such as HDR, 4K, VIDEO and PHOTO.

                                                  • A summer sale post

                                                    Both FLUX.2 Pro and Nano Banana Pro passed; Nano Banana Pro's image came 130.9 s sooner (43.5 s to 174.4 s), and FLUX.2 Pro's cost $0.065 less at kie.ai.

                                                    FLUX.2 ProPassed
                                                    FLUX.2 Pro's image for “A summer sale post”
                                                      Nano Banana ProPassed
                                                      Nano Banana Pro's image for “A summer sale post”

                                                      • A book club announcement, top and bottom

                                                        Only Nano Banana Pro passed, not FLUX.2 Pro; Nano Banana Pro's image came 135.4 s sooner (40.8 s to 176.2 s), and FLUX.2 Pro's cost $0.065 less at kie.ai.

                                                        FLUX.2 ProFailed
                                                        FLUX.2 Pro's image for “A book club announcement, top and bottom”
                                                        • Apart from those two lines, is nothing else written? No: The book's pages contain small lines of text and page numbers, so other writing appears in the image, though it is illegible.
                                                        Nano Banana ProPassed
                                                        Nano Banana Pro's image for “A book club announcement, top and bottom”

                                                        More image models, compared

                                                        Questions

                                                        Is FLUX.2 Pro better than Nano Banana Pro?

                                                        On our 16 image test prompts, FLUX.2 Pro passed 14 and Nano Banana Pro 13, each image checked the same way. Nano Banana Pro was quicker, 36.2 s an image against 60.7 s. In llmwise a FLUX.2 Pro image counts as 2 Claude Haiku 4.5 messages and a Nano Banana Pro image as 5 Claude Haiku 4.5 messages: up to 125 and 50 images a month on Pro.

                                                        Which is cheaper in llmwise, FLUX.2 Pro or Nano Banana Pro?

                                                        FLUX.2 Pro: in llmwise its image counts as 2 Claude Haiku 4.5 messages, against 5 Claude Haiku 4.5 messages for Nano Banana Pro.

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