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Image models compared

GPT Image 2.5 Flare vs Nano Banana Pro: the same prompts, side by side

OpenAI's GPT Image 2.5 Flare 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, GPT Image 2.5 Flare and Nano Banana Pro each passed 13, each image checked the same way. Nano Banana Pro was quicker, 36.2 s an image against 67.4 s. In llmwise a GPT Image 2.5 Flare 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.

GPT Image 2.5 Flare and Nano Banana Pro in llmwise

What llmwise asks GPT Image 2.5 Flare and Nano Banana Pro for, and what an image of each counts as.

GPT Image 2.5 Flare and Nano Banana Pro in llmwise
FactGPT Image 2.5 FlareNano Banana Pro
Made byOpenAIGoogle
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

GPT Image 2.5 Flare passed 13 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.

GPT Image 2.5 Flare and Nano Banana Pro, job by job
JobGPT Image 2.5 FlareNano 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 thumbnails1 of 2 passed, 11 of 12 checks1 of 2 passed, 11 of 12 checks
Social media posts1 of 2 passed, 10 of 12 checks2 of 2 passed, 12 of 12 checks

The same prompts, side by side

GPT Image 2.5 Flare'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 GPT Image 2.5 Flare and Nano Banana Pro passed; Nano Banana Pro's image came 20.2 s sooner (38.6 s to 58.9 s), and GPT Image 2.5 Flare's cost $0.060 less at kie.ai.

    GPT Image 2.5 FlarePassed
    GPT Image 2.5 Flare'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 GPT Image 2.5 Flare and Nano Banana Pro passed; Nano Banana Pro's image came 17.7 s sooner (38.5 s to 56.1 s), and GPT Image 2.5 Flare's cost $0.060 less at kie.ai.

        GPT Image 2.5 FlarePassed
        GPT Image 2.5 Flare'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 GPT Image 2.5 Flare passed, not Nano Banana Pro; Nano Banana Pro's image came 27.8 s sooner (31.0 s to 58.8 s), and GPT Image 2.5 Flare's cost $0.060 less at kie.ai.

            GPT Image 2.5 FlarePassed
            GPT Image 2.5 Flare'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 GPT Image 2.5 Flare and Nano Banana Pro passed; Nano Banana Pro's image came 27.9 s sooner (31.6 s to 59.5 s), and GPT Image 2.5 Flare's cost $0.060 less at kie.ai.

              GPT Image 2.5 FlarePassed
              GPT Image 2.5 Flare'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 GPT Image 2.5 Flare and Nano Banana Pro passed; Nano Banana Pro's image came 12.6 s sooner (44.4 s to 57.0 s), and GPT Image 2.5 Flare's cost $0.060 less at kie.ai.

                  GPT Image 2.5 FlarePassed
                  GPT Image 2.5 Flare'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 GPT Image 2.5 Flare and Nano Banana Pro passed; Nano Banana Pro's image came 25.4 s sooner (36.4 s to 61.8 s), and GPT Image 2.5 Flare's cost $0.060 less at kie.ai.

                      GPT Image 2.5 FlarePassed
                      GPT Image 2.5 Flare'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 GPT Image 2.5 Flare and Nano Banana Pro passed; Nano Banana Pro's image came 70.6 s sooner (44.1 s to 114.6 s), and GPT Image 2.5 Flare's cost $0.060 less at kie.ai.

                          GPT Image 2.5 FlarePassed
                          GPT Image 2.5 Flare'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 GPT Image 2.5 Flare passed, not Nano Banana Pro; Nano Banana Pro's image came 34.2 s sooner (31.3 s to 65.4 s), and GPT Image 2.5 Flare's cost $0.060 less at kie.ai.

                              GPT Image 2.5 FlarePassed
                              GPT Image 2.5 Flare'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 GPT Image 2.5 Flare and Nano Banana Pro passed; Nano Banana Pro's image came 20.4 s sooner (47.3 s to 67.6 s), and GPT Image 2.5 Flare's cost $0.060 less at kie.ai.

                                GPT Image 2.5 FlarePassed
                                GPT Image 2.5 Flare'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 GPT Image 2.5 Flare and Nano Banana Pro passed; Nano Banana Pro's image came 36.5 s sooner (30.7 s to 67.2 s), and GPT Image 2.5 Flare's cost $0.060 less at kie.ai.

                                    GPT Image 2.5 FlarePassed
                                    GPT Image 2.5 Flare'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 GPT Image 2.5 Flare and Nano Banana Pro passed; Nano Banana Pro's image came 30.7 s sooner (28.1 s to 58.8 s), and GPT Image 2.5 Flare's cost $0.060 less at kie.ai.

                                        GPT Image 2.5 FlarePassed
                                        GPT Image 2.5 Flare'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 GPT Image 2.5 Flare; Nano Banana Pro's image came 66.0 s sooner (33.4 s to 99.4 s), and GPT Image 2.5 Flare's cost $0.060 less at kie.ai.

                                            GPT Image 2.5 FlareFailed
                                            GPT Image 2.5 Flare'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 partly hidden by the rope and jacket, so a clear count of five natural fingers on each hand isn't possible.
                                            Nano Banana ProPassed
                                            Nano Banana Pro's image for “A fisherman holding a rope in both hands”

                                            • A cooking video thumbnail

                                              Both GPT Image 2.5 Flare and Nano Banana Pro passed; Nano Banana Pro's image came 38.0 s sooner (28.3 s to 66.3 s), and GPT Image 2.5 Flare's cost $0.060 less at kie.ai.

                                              GPT Image 2.5 FlarePassed
                                              GPT Image 2.5 Flare'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

                                                  Neither GPT Image 2.5 Flare nor Nano Banana Pro passed; Nano Banana Pro's image came 25.3 s sooner (30.7 s to 55.9 s), and GPT Image 2.5 Flare's cost $0.060 less at kie.ai.

                                                  GPT Image 2.5 FlareFailed
                                                  GPT Image 2.5 Flare's image for “A phone review thumbnail with a question”
                                                  • Is there only one piece of writing? No: The writing is on two separate lines, 'WORTH' and 'IT?', although they form one phrase.
                                                  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 GPT Image 2.5 Flare and Nano Banana Pro passed; Nano Banana Pro's image came 15.0 s sooner (43.5 s to 58.5 s), and GPT Image 2.5 Flare's cost $0.060 less at kie.ai.

                                                  GPT Image 2.5 FlarePassed
                                                  GPT Image 2.5 Flare'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 GPT Image 2.5 Flare; Nano Banana Pro's image came 32.1 s sooner (40.8 s to 72.9 s), and GPT Image 2.5 Flare's cost $0.060 less at kie.ai.

                                                      GPT Image 2.5 FlareFailed
                                                      GPT Image 2.5 Flare'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 of writing (BOOK and CLUB), not one, plus THURSDAY 7PM at the bottom.
                                                      • Apart from those two lines, is nothing else written? No: Besides the top and bottom text, the open book's pages have small print, though it is unreadable.
                                                      Nano Banana ProPassed
                                                      Nano Banana Pro's image for “A book club announcement, top and bottom”

                                                      More image models, compared

                                                      Questions

                                                      Is GPT Image 2.5 Flare better than Nano Banana Pro?

                                                      On our 16 image test prompts, GPT Image 2.5 Flare and Nano Banana Pro each passed 13, each image checked the same way. Nano Banana Pro was quicker, 36.2 s an image against 67.4 s. In llmwise a GPT Image 2.5 Flare 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, GPT Image 2.5 Flare or Nano Banana Pro?

                                                      GPT Image 2.5 Flare: 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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