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Image models compared

GPT Image 2.5 Flare vs Nano Banana 2: the same prompts, side by side

OpenAI's GPT Image 2.5 Flare and Google's Nano Banana 2 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 passed 14 and GPT Image 2.5 Flare 13, each image checked the same way. GPT Image 2.5 Flare was quicker, 67.4 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.

GPT Image 2.5 Flare and Nano Banana 2 in llmwise

What llmwise asks GPT Image 2.5 Flare and Nano Banana 2 for, and what an image of each counts as.

GPT Image 2.5 Flare and Nano Banana 2 in llmwise
FactGPT Image 2.5 FlareNano Banana 2
Made byOpenAIGoogle
Made throughkie.aikie.ai
Output size1K1K
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

GPT Image 2.5 Flare passed 13 of 16 and Nano Banana 2 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.

GPT Image 2.5 Flare and Nano Banana 2, job by job
JobGPT Image 2.5 FlareNano Banana 2
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
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 checks1 of 2 passed, 10 of 12 checks

The same prompts, side by side

GPT Image 2.5 Flare's and Nano Banana 2'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 2 passed; Nano Banana 2's image came 10.2 s sooner (48.6 s to 58.9 s), and GPT Image 2.5 Flare's cost $0.010 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 2Passed
      Nano Banana 2'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 2 passed; GPT Image 2.5 Flare's image came 63.3 s sooner (56.1 s to 119.5 s), and GPT Image 2.5 Flare's cost $0.010 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 2Passed
          Nano Banana 2's image for “A wheel and a wrench in one icon”

          • A bakery sign with two lines

            Both GPT Image 2.5 Flare and Nano Banana 2 passed; Nano Banana 2's image came 10.2 s sooner (48.6 s to 58.8 s), and GPT Image 2.5 Flare's cost $0.010 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 2Passed
              Nano Banana 2's image for “A bakery sign with two lines”

              • A café menu board with four prices

                Both GPT Image 2.5 Flare and Nano Banana 2 passed; Nano Banana 2's image came 15.4 s sooner (44.1 s to 59.5 s), and GPT Image 2.5 Flare's cost $0.010 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 2Passed
                  Nano Banana 2'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 2 passed; Nano Banana 2's image came 13.3 s sooner (43.8 s to 57.0 s), and GPT Image 2.5 Flare's cost $0.010 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 2Passed
                      Nano Banana 2'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 2 passed; Nano Banana 2's image came 17.2 s sooner (44.6 s to 61.8 s), and GPT Image 2.5 Flare's cost $0.010 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 2Passed
                          Nano Banana 2's image for “A perfume bottle and its reflection”

                          • A bowl of ramen from above

                            Both GPT Image 2.5 Flare and Nano Banana 2 passed; GPT Image 2.5 Flare's image came 38.5 s sooner (114.6 s to 153.1 s), and GPT Image 2.5 Flare's cost $0.010 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 2Passed
                              Nano Banana 2's image for “A bowl of ramen from above”

                              • A rainy street at night, one red umbrella

                                Both GPT Image 2.5 Flare and Nano Banana 2 passed; GPT Image 2.5 Flare's image came 78.7 s sooner (65.4 s to 144.1 s), and GPT Image 2.5 Flare's cost $0.010 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 2Passed
                                  Nano Banana 2's image for “A rainy street at night, one red umbrella”

                                  • A watercolour fox for a children's book

                                    Both GPT Image 2.5 Flare and Nano Banana 2 passed; Nano Banana 2's image came 20.4 s sooner (47.2 s to 67.6 s), and GPT Image 2.5 Flare's cost $0.010 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 2Passed
                                      Nano Banana 2'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 2 passed; GPT Image 2.5 Flare's image came 116.4 s sooner (67.2 s to 183.6 s), and GPT Image 2.5 Flare's cost $0.010 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 2Passed
                                          Nano Banana 2's image for “Three people at one laptop, flat vector”

                                          • A studio headshot

                                            Both GPT Image 2.5 Flare and Nano Banana 2 passed; GPT Image 2.5 Flare's image came 7.7 s sooner (58.8 s to 66.5 s), and GPT Image 2.5 Flare's cost $0.010 less at kie.ai.

                                            GPT Image 2.5 FlarePassed
                                            GPT Image 2.5 Flare's image for “A studio headshot”
                                              Nano Banana 2Passed
                                              Nano Banana 2's image for “A studio headshot”

                                              • A fisherman holding a rope in both hands

                                                Only Nano Banana 2 passed, not GPT Image 2.5 Flare; GPT Image 2.5 Flare's image came 17.8 s sooner (99.4 s to 117.2 s), and GPT Image 2.5 Flare's cost $0.010 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 2Passed
                                                Nano Banana 2's image for “A fisherman holding a rope in both hands”

                                                • A cooking video thumbnail

                                                  Both GPT Image 2.5 Flare and Nano Banana 2 passed; Nano Banana 2's image came 50.8 s sooner (15.5 s to 66.3 s), and GPT Image 2.5 Flare's cost $0.010 less at kie.ai.

                                                  GPT Image 2.5 FlarePassed
                                                  GPT Image 2.5 Flare's image for “A cooking video thumbnail”
                                                    Nano Banana 2Passed
                                                    Nano Banana 2's image for “A cooking video thumbnail”

                                                    • A phone review thumbnail with a question

                                                      Neither GPT Image 2.5 Flare nor Nano Banana 2 passed; GPT Image 2.5 Flare's image came 133.5 s sooner (55.9 s to 189.4 s), and GPT Image 2.5 Flare's cost $0.010 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 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.

                                                    • A summer sale post

                                                      Both GPT Image 2.5 Flare and Nano Banana 2 passed; Nano Banana 2's image came 2.4 s sooner (56.0 s to 58.5 s), and GPT Image 2.5 Flare's cost $0.010 less at kie.ai.

                                                      GPT Image 2.5 FlarePassed
                                                      GPT Image 2.5 Flare's image for “A summer sale post”
                                                        Nano Banana 2Passed
                                                        Nano Banana 2's image for “A summer sale post”

                                                        • A book club announcement, top and bottom

                                                          Neither GPT Image 2.5 Flare nor Nano Banana 2 passed; GPT Image 2.5 Flare's image came 12.6 s sooner (72.9 s to 85.5 s), and GPT Image 2.5 Flare's cost $0.010 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 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.

                                                        More image models, compared

                                                        Questions

                                                        Is GPT Image 2.5 Flare better than Nano Banana 2?

                                                        On our 16 image test prompts, Nano Banana 2 passed 14 and GPT Image 2.5 Flare 13, each image checked the same way. GPT Image 2.5 Flare was quicker, 67.4 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, GPT Image 2.5 Flare or Nano Banana 2?

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

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