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nano-banana-v2 is Google’s lightweight image model with image-to-image edits layered onto the same protocol surface and roughly the same cost profile as nano-banana. The differentiator is the optional source_image field: when present, the model treats it as a reference (style transfer, mask edit, background swap) rather than generating from text alone. Pricing: $0.022 / image — see the rate card. Failures don’t bill; image-to-image runs at the same per-image rate as text-to-image.

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Protocols

ProtocolPath
OpenAI ImagesPOST https://llm.bytespike.ai/v1/images/generations

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Quickstart

curl https://llm.bytespike.ai/v1/images/generations \
  -H "Authorization: Bearer $BYTESPIKE_API_KEY" \
  -H "content-type: application/json" \
  -d '{
    "model": "nano-banana-v2",
    "prompt": "Same product, change the background to deep blue",
    "source_image": "https://example.com/source.png",
    "n": 1,
    "size": "1024x1024"
  }'
The DOSIA generate_image tool passes source_image through automatically when you’ve attached one in the chat.

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Capabilities

CapabilitySupported
Text-to-image✅
Image-to-image (with source_image)✅
n ≥ 2 batch generation✅
size 1024×1024 / 1024×1792 / 1792×1024✅
response_format url / b64_json✅
Modalityimage
Capability bucketimage_generate

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When to use

  • DOSIA “edit this image” requests — main brain attaches the chat image and routes here when permission is granted.
  • Background swaps, style transfers, mask edits without the cost of gpt-image-2.
  • Cost-sensitive image-to-image pipelines — volume programmatic edits.
When not to use:
  • Pure text-to-image where image-to-image isn’t needed — nano-banana gets you the same baseline at the same tier.
  • Top-fidelity typography or marketing hero — gpt-image-2.

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