feat: Nano Banana GA and video input samples (#14246)

* feat: Nano Banana GA and video input samples

* Update genai/image_generation/imggen_mmflash_img_with_vid.py

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

---------

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: katiemn

genai/image_generation/imggen_mmflash_edit_img_with_txt_img.py

@@ -26,7 +26,7 @@ def generate_content() -> str:
     image = Image.open("test_resources/example-image-eiffel-tower.png")
 
     response = client.models.generate_content(
-        model="gemini-3-pro-image-preview",
+        model="gemini-3.1-flash-image",
         contents=[image, "Edit this image to make it look like a cartoon."],
         config=GenerateContentConfig(response_modalities=[Modality.TEXT, Modality.IMAGE]),
     )

genai/image_generation/imggen_mmflash_img_with_vid.py

@@ -0,0 +1,51 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+def generate_content() -> str:
+    # [START googlegenaisdk_imggen_mmflash_img_with_vid]
+    from google import genai
+    from google.genai.types import GenerateContentConfig, Modality, Part
+    from PIL import Image
+    from io import BytesIO
+
+    client = genai.Client()
+
+    # A video on 'The ABCs of agent building'
+    video = "https://www.youtube.com/watch?v=rjoMZyxncUI"
+
+    response = client.models.generate_content(
+        model="gemini-3.1-flash-image",
+        contents=[
+            Part.from_uri(
+                file_uri=video,
+                mime_type="video/mp4"
+            ), 
+            "Generate an infographic of the topics covered in this video."
+        ],
+        config=GenerateContentConfig(response_modalities=[Modality.TEXT, Modality.IMAGE]),
+    )
+    for part in response.candidates[0].content.parts:
+        if part.text:
+            print(part.text)
+        elif part.inline_data:
+            image = Image.open(BytesIO((part.inline_data.data)))
+            image.save("output_folder/video-image.png")
+
+    # [END googlegenaisdk_imggen_mmflash_img_with_vid]
+    return "output_folder/video-image.png"
+
+
+if __name__ == "__main__":
+    generate_content()

genai/image_generation/imggen_mmflash_locale_aware_with_txt.py

@@ -23,7 +23,7 @@ def generate_content() -> str:
     client = genai.Client()
 
     response = client.models.generate_content(
-        model="gemini-2.5-flash-image",
+        model="gemini-3.1-flash-image",
         contents=("Generate a photo of a breakfast meal."),
         config=GenerateContentConfig(response_modalities=[Modality.TEXT, Modality.IMAGE]),
     )

genai/image_generation/imggen_mmflash_multiple_imgs_with_txt.py

@@ -23,7 +23,7 @@ def generate_content() -> str:
     client = genai.Client()
 
     response = client.models.generate_content(
-        model="gemini-2.5-flash-image",
+        model="gemini-3.1-flash-image",
         contents=("Generate 3 images a cat sitting on a chair."),
         config=GenerateContentConfig(response_modalities=[Modality.TEXT, Modality.IMAGE]),
     )

genai/image_generation/imggen_mmflash_txt_and_img_with_txt.py

@@ -23,7 +23,7 @@ def generate_content() -> int:
     client = genai.Client()
 
     response = client.models.generate_content(
-        model="gemini-3-pro-image-preview",
+        model="gemini-3.1-flash-image",
         contents=(
             "Generate an illustrated recipe for a paella."
             "Create images to go alongside the text as you generate the recipe"

genai/image_generation/imggen_mmflash_with_txt.py

@@ -25,7 +25,7 @@ def generate_content() -> str:
     client = genai.Client()
 
     response = client.models.generate_content(
-        model="gemini-3-pro-image-preview",
+        model="gemini-3.1-flash-image",
         contents=("Generate an image of the Eiffel tower with fireworks in the background."),
         config=GenerateContentConfig(
             response_modalities=[Modality.TEXT, Modality.IMAGE],

genai/image_generation/test_image_generation_mmflash.py

@@ -19,6 +19,7 @@
 import os
 
 import imggen_mmflash_edit_img_with_txt_img
+import imggen_mmflash_img_with_vid
 import imggen_mmflash_locale_aware_with_txt
 import imggen_mmflash_multiple_imgs_with_txt
 import imggen_mmflash_txt_and_img_with_txt
@@ -49,3 +50,6 @@ def test_imggen_mmflash_locale_aware_with_txt() -> None:
 
 def test_imggen_mmflash_multiple_imgs_with_txt() -> None:
     assert imggen_mmflash_multiple_imgs_with_txt.generate_content()
+
+def test_imggen_mmflash_img_with_vid() -> None:
+    assert imggen_mmflash_img_with_vid.generate_content()