GPT Image 2.5 API Reference | Nano Banana Pro API

GPT Image 2.5

GPT Image 2.5 for sharper detail, cleaner typography and up to 4K output, in two looks

Endpoint: POST /api/v1/images/generate
model: gpt-image-2.5
Output: Image
Credits: from 5

Invia un'attività

POST/api/v1/images/generate

Parametri

modelstringObbligatorio
Must be "gpt-image-2.5"
typestringFacoltativoPredefinito text-to-image
"text-to-image" or "image-to-image" (default: text-to-image)
text-to-imageimage-to-image
promptstringObbligatorio
Text description (3–20000 chars)
image_urlsstring[]Facoltativo
Required for image-to-image. 1–16 public https image URLs
image_sizestringFacoltativoPredefinito auto
Aspect ratio: "auto" (default), "1:1", "3:2", "2:3", "4:3", "3:4", "16:9", "9:16", "21:9", "27:16", "16:27", "9:8" or "8:9"
auto1:13:22:34:33:416:99:1621:927:1616:279:88:9
resolutionstringFacoltativoPredefinito 1K
"1K" (default), "2K" or "4K"
1K2K4K
variantstringFacoltativoPredefinito flare
Look of the image: "flare" (default) or "sunburst"
flaresunburst
generation_modestringFacoltativoPredefinito standard
"standard" (default), "economy" (needs an account with a purchase) or "stable" (same price for every account; needs a fixed image_size, "auto" is refused before charging)
standardeconomystable
num_imagesnumberFacoltativo
Must be 1

Richiesta

curl -X POST https://www.bananapro.site/api/v1/images/generate \
  -H "Authorization: Bearer sk-your-api-key" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: docs-gpt25-text-001" \
  -d '{
    "model": "gpt-image-2.5",
    "resolution": "2K",
    "image_size": "3:2",
    "prompt": "A product shot of a glass perfume bottle on wet black stone, soft rim light"
  }'

Risposta200

JSON

{
  "success": true,
  "data": {
    "task_id": "g25-3f9c1e…",
    "credits_used": 14,
    "remaining_credits": 486,
    "model": "gpt-image-2.5",
    "resolution": "2K"
  }
}

I valori di credits_used in questi esempi sono indicativi. Il consumo effettivo viene calcolato all'invio e restituito dall'API.

Consulta l'attività

GET/api/v1/images/{task_id}

status

pending: Accepted and waiting to start. Keep polling.
processing: Running. Keep polling.
completed: Finished. Read image_url; output holds the full result.
failed: Ended without a result. error_message says why and credits_refunded shows what was returned.

Poll every 5 to 10 seconds and stop at completed or failed, or register a webhook to be notified instead. Failed tasks are refunded automatically.

Richiesta

curl https://www.bananapro.site/api/v1/images/task_abc123 \
  -H "Authorization: Bearer sk-your-api-key"

Risposta200

JSON

{
  "success": true,
  "data": {
    "task_id": "task_abc123",
    "model": "gpt-image-2.5",
    "status": "completed",
    "output": { "images": [{ "url": "https://..." }] },
    "primary_url": "https://...",
    "image_url": "https://...",
    "error_message": null,
    "credits_used": 14,
    "credits_refunded": 0,
    "created_at": "2026-10-04T10:00:00.000Z",
    "updated_at": "2026-10-04T10:01:12.000Z",
    "completed_at": "2026-10-04T10:01:12.000Z"
  },
  "request_id": "req_abc123"
}

Attendi il risultato

TASK_ID=task_abc123
while true; do
  TASK=$(curl -s https://www.bananapro.site/api/v1/images/$TASK_ID \
    -H "Authorization: Bearer sk-your-api-key")
  STATUS=$(echo "$TASK" | jq -r '.data.status')
  if [ "$STATUS" = "completed" ] || [ "$STATUS" = "failed" ]; then
    echo "$TASK" | jq
    break
  fi
  sleep 10
done

Prezzi

Mode	1K	2K	4K
standard, account with a purchase	8	14	20
standard, account without a purchase	16	28	40
stable (needs a fixed image_size)	15	20	25
economy (needs a purchase)	5	8	12

Credits per image. Without a purchase, economy returns 403 purchase_required before anything is charged.

Caratteristiche

Text-to-image and image-to-image (up to 16 reference images)
1K, 2K and 4K output with 13 aspect ratios, or auto
Two looks: flare (default) and sunburst
Standard mode for every account; economy at a lower price once the account has a purchase; stable for a fixed per-image price

curl -X POST https://www.bananapro.site/api/v1/images/generate \ -H "Authorization: Bearer sk-your-api-key" \ -H "Content-Type: application/json" \ -H "Idempotency-Key: docs-gpt25-text-001" \ -d '{ "model": "gpt-image-2.5", "resolution": "2K", "image_size": "3:2", "prompt": "A product shot of a glass perfume bottle on wet black stone, soft rim light" }'

{ "success": true, "data": { "task_id": "task_abc123", "model": "gpt-image-2.5", "status": "completed", "output": { "images": [{ "url": "https://..." }] }, "primary_url": "https://...", "image_url": "https://...", "error_message": null, "credits_used": 14, "credits_refunded": 0, "created_at": "2026-10-04T10:00:00.000Z", "updated_at": "2026-10-04T10:01:12.000Z", "completed_at": "2026-10-04T10:01:12.000Z" }, "request_id": "req_abc123" }

TASK_ID=task_abc123 while true; do TASK=$(curl -s https://www.bananapro.site/api/v1/images/$TASK_ID \ -H "Authorization: Bearer sk-your-api-key") STATUS=$(echo "$TASK" | jq -r '.data.status') if [ "$STATUS" = "completed" ] || [ "$STATUS" = "failed" ]; then echo "$TASK" | jq break fi sleep 10 done

Mode

standard, account with a purchase

standard, account without a purchase

stable (needs a fixed image_size)

economy (needs a purchase)