Image Studio pricing
Image Generate Studio charges image credits per output image — cost depends on model, resolution, and quality.
Last updated Sep 6, 2026
Image Studio uses the image credit pool (9 HKD per 100 credits for individual
top-ups). Each generation charges:
total credits = credits_per_image × number_of_images (1–4)
Credits are checked before generation starts and deducted only after images
successfully complete (see When credits are not used).
Top-up rate
| Individual top-up | 9 HKD / 100 image credits (0.09 HKD per credit) |
| School pool top-up | 90 HKD per pack → 1,000 credits to the school bonus pool (10× individual pack) |
Target margin on paid usage is ~25% after fal.ai generation cost.
Credits by model
Rates below are per image at the listed size/quality. GPT Image 2 custom sizes
above ~2.5K pixels apply a ×2 multiplier on the quality rate.
Nano Banana family
| Model | Size | Credits / image |
|---|---|---|
| Nano Banana | 1K | 5 |
| Nano Banana 2 | 0.5K | 7 |
| 1K | 10 | |
| 2K | 14 | |
| 4K | 19 | |
| Nano Banana Pro | 1K | 18 |
| 2K | 26 | |
| 4K | 35 |
GPT image models
| Model | Quality | Credits / image |
|---|---|---|
| GPT 5 Image | low | 2 |
| medium | 4 | |
| high | 16 | |
| GPT Image 2 | low | 2 |
| medium | 7 | |
| high / auto | 26 |
Flux
| Model | Size | Credits / image |
|---|---|---|
| Flux 2 Pro | 1K | 4 |
| Flux 2 Klein | 1K | 3 |
Worked examples
| Request | Calculation | Total credits |
|---|---|---|
| GPT Image 2, high, 1 image | 26 × 1 | 26 |
| GPT Image 2, high, 3 images | 26 × 3 | 78 |
| Nano Banana 2, 2K, 4 images | 14 × 4 | 56 |
| GPT 5 Image, medium, 1 image | 4 × 1 | 4 |
| GPT Image 2, high, 3840×2160 | 26 × 2 (size multiplier) | 52 |
In HKD (individual top-up rate): 26 credits ≈ 2.34 HKD per high GPT Image 2 image.
Also uses image credits
These features draw from the same image pool, not chat credits:
- Tutor Studio — slide images, infographics
- Image Generate Studio — all models above
In-chat image generation via agent tools uses chat credits (10 per image) instead.
School defaults
Each school member starts with a 100 image credit plan-base cap (before admin
bonus assignment). Monthly resets return caps to the school default unless the
admin has raised them.
See School credits: users, top-up & assign for how admins buy pool packs and
assign extra caps.
Rates follow fal.ai provider costs and may be updated via backend migrations.
The live credit estimate in Image Studio is always authoritative.
