feat(backend/blocks): Add google banana pro (#11425)

This PR adds the latest google banana pro image generator and editor to
the platform and fixes up some of the prices for the image generation
models

I asked for ``Generate a image of a dog on a skateboard`` and this is
what i got:
<img width="2048" height="2048" alt="image"
src="https://github.com/user-attachments/assets/9b6c16d8-df8f-4fb6-a009-d6d342f9beb7"
/>

### Checklist 📋

#### For code changes:
- [x] I have clearly listed my changes in the PR description
- [x] I have made a test plan
- [x] I have tested my changes according to the test plan:
  <!-- Put your test plan here: -->
- [x] Test the image generator and image editor block using the latest
google banana pro model and it works

---------

Co-authored-by: Abhimanyu Yadav <[email protected]>

Author: Bentlybro

autogpt_platform/backend/backend/blocks/ai_image_customizer.py

@@ -24,6 +24,7 @@
 
 class GeminiImageModel(str, Enum):
     NANO_BANANA = "google/nano-banana"
+    NANO_BANANA_PRO = "google/nano-banana-pro"
 
 
 class OutputFormat(str, Enum):

autogpt_platform/backend/backend/blocks/ai_image_generator_block.py

@@ -60,6 +60,14 @@ class ImageSize(str, Enum):
     ImageSize.TALL: "1024x1536",
 }
 
+SIZE_TO_NANO_BANANA_RATIO = {
+    ImageSize.SQUARE: "1:1",
+    ImageSize.LANDSCAPE: "4:3",
+    ImageSize.PORTRAIT: "3:4",
+    ImageSize.WIDE: "16:9",
+    ImageSize.TALL: "9:16",
+}
+
 
 class ImageStyle(str, Enum):
     """
@@ -98,6 +106,7 @@ class ImageGenModel(str, Enum):
     FLUX_ULTRA = "Flux 1.1 Pro Ultra"
     RECRAFT = "Recraft v3"
     SD3_5 = "Stable Diffusion 3.5 Medium"
+    NANO_BANANA_PRO = "Nano Banana Pro"
 
 
 class AIImageGeneratorBlock(Block):
@@ -261,6 +270,20 @@ async def generate_image(self, input_data: Input, credentials: APIKeyCredentials
                 )
                 return output
 
+            elif input_data.model == ImageGenModel.NANO_BANANA_PRO:
+                # Use Nano Banana Pro (Google Gemini 3 Pro Image)
+                input_params = {
+                    "prompt": modified_prompt,
+                    "aspect_ratio": SIZE_TO_NANO_BANANA_RATIO[input_data.size],
+                    "resolution": "2K",  # Default to 2K for good quality/cost balance
+                    "output_format": "jpg",
+                    "safety_filter_level": "block_only_high",  # Most permissive
+                }
+                output = await self._run_client(
+                    credentials, "google/nano-banana-pro", input_params
+                )
+                return output
+
         except Exception as e:
             raise RuntimeError(f"Failed to generate image: {str(e)}")
 

autogpt_platform/backend/backend/data/block_cost_config.py

@@ -1,5 +1,7 @@
 from typing import Type
 
+from backend.blocks.ai_image_customizer import AIImageCustomizerBlock, GeminiImageModel
+from backend.blocks.ai_image_generator_block import AIImageGeneratorBlock, ImageGenModel
 from backend.blocks.ai_music_generator import AIMusicGeneratorBlock
 from backend.blocks.ai_shortform_video_block import (
     AIAdMakerVideoCreatorBlock,
@@ -536,4 +538,85 @@
             },
         )
     ],
+    AIImageGeneratorBlock: [
+        BlockCost(
+            cost_amount=5,  # SD3.5 Medium: ~$0.035 per image
+            cost_filter={
+                "model": ImageGenModel.SD3_5,
+                "credentials": {
+                    "id": replicate_credentials.id,
+                    "provider": replicate_credentials.provider,
+                    "type": replicate_credentials.type,
+                },
+            },
+        ),
+        BlockCost(
+            cost_amount=6,  # Flux 1.1 Pro: ~$0.04 per image
+            cost_filter={
+                "model": ImageGenModel.FLUX,
+                "credentials": {
+                    "id": replicate_credentials.id,
+                    "provider": replicate_credentials.provider,
+                    "type": replicate_credentials.type,
+                },
+            },
+        ),
+        BlockCost(
+            cost_amount=10,  # Flux 1.1 Pro Ultra: ~$0.08 per image
+            cost_filter={
+                "model": ImageGenModel.FLUX_ULTRA,
+                "credentials": {
+                    "id": replicate_credentials.id,
+                    "provider": replicate_credentials.provider,
+                    "type": replicate_credentials.type,
+                },
+            },
+        ),
+        BlockCost(
+            cost_amount=7,  # Recraft v3: ~$0.05 per image
+            cost_filter={
+                "model": ImageGenModel.RECRAFT,
+                "credentials": {
+                    "id": replicate_credentials.id,
+                    "provider": replicate_credentials.provider,
+                    "type": replicate_credentials.type,
+                },
+            },
+        ),
+        BlockCost(
+            cost_amount=14,  # Nano Banana Pro: $0.14 per image at 2K
+            cost_filter={
+                "model": ImageGenModel.NANO_BANANA_PRO,
+                "credentials": {
+                    "id": replicate_credentials.id,
+                    "provider": replicate_credentials.provider,
+                    "type": replicate_credentials.type,
+                },
+            },
+        ),
+    ],
+    AIImageCustomizerBlock: [
+        BlockCost(
+            cost_amount=10,  # Nano Banana (original)
+            cost_filter={
+                "model": GeminiImageModel.NANO_BANANA,
+                "credentials": {
+                    "id": replicate_credentials.id,
+                    "provider": replicate_credentials.provider,
+                    "type": replicate_credentials.type,
+                },
+            },
+        ),
+        BlockCost(
+            cost_amount=14,  # Nano Banana Pro: $0.14 per image at 2K
+            cost_filter={
+                "model": GeminiImageModel.NANO_BANANA_PRO,
+                "credentials": {
+                    "id": replicate_credentials.id,
+                    "provider": replicate_credentials.provider,
+                    "type": replicate_credentials.type,
+                },
+            },
+        ),
+    ],
 }