Nano Banana

What is Nano Banana?#

Nano Banana is Google's August 2025 Gemini 2.5 Flash image route. It is the cheapest and fastest option in the Nano Banana family, returning a single still in roughly 1.5 to 2 seconds with output near 1024×1024. The standout features are ten aspect ratios native to the call (1:1 through 21:9) and up to 20 reference images per request. The trade is text rendering, which is unreliable past three or four words, and a hard resolution ceiling that rules out print delivery. Use it for brainstorming and high-volume drafting, then regenerate the winners on Nano Banana 2 or Pro for production.

Key features of Nano Banana#

Ten aspect ratios from a single endpoint

1:1 for feed posts, 9:16 for reel covers, 21:9 for ultra-wide banners, plus 4:5 and 5:4 for vertical and horizontal social. Same prompt across the lot, no separate crop step.

Up to 20 reference images per call

Pass an array of URLs alongside the prompt for layout drafts, brand exploration, and rapid composition variants. Each reference can be up to 10 MB.

Sub-2-second turnaround

Roughly 3x faster than Nano Banana Pro. Useful when a creative team is sweeping dozens of prompts before locking a direction or A/B testing tens of compositions for the same brief.

Best for#

Use cases#

Sweep a campaign hero across all ten aspect ratios in a single batch. The same prompt feeds 1:1 for feed, 9:16 for stories, 16:9 for landing, and 21:9 for the ultra-wide banner, and the cheapest run picks the winner. Build out brand exploration boards by passing 15 to 20 references per call and letting the prompt remix them into a dozen compositional drafts. Stand up internal-facing imagery (Slack avatars, doc thumbnails, deck headers) without touching the design queue. Once a frame is worth keeping, regenerate it on Nano Banana 2 with explicit resolution control, or on Pro for the photoreal hero shot.

API examples#

Call Nano Banana from any language by POSTing to /v1/tasks. Full parameter docs live at docs.unifically.com/models/image/google/nano-banana.

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "google/nano-banana",
    "input": {
      "prompt": "A futuristic city skyline at sunset with flying cars",
      "aspect_ratio": "16:9"
    }
  }'

Successful submission returns a task_id. Poll GET /v1/tasks/<task_id> or set a callback_url on the request to receive the finished result.