5 genres × 6 models = 30 images • Generated via OpenRouter API •
Total test cost: $3.28 • Budget: $9.00 • Remaining: ~$5.72
Overall Ranking
Rank
Model
OpenRouter Slug
Avg Score
Cost / Image
Cost for 450 Genres
Value Rating
1
GPT-5 Image Mini
openai/gpt-5-image-mini
7.7 / 10
$0.045
$20
BEST VALUE
2
Riverflow V2 Pro
sourceful/riverflow-v2-pro
8.4 / 10
$0.150
$68
Best quality, expensive
3
Seedream 4.5
bytedance-seed/seedream-4.5
7.1 / 10
$0.040
$18
Cheapest, ignores rules
4
Nano Banana 2
google/gemini-3.1-flash-image-preview
7.1 / 10
$0.068
$30
Inconsistent quality
5
Nano Banana Pro
google/gemini-3-pro-image-preview
7.7 / 10
$0.140
$63
Good quality, too pricey
6
GPT-5 Image
openai/gpt-5-image
7.5 / 10
$0.214
$96
Not worth 5x Mini price
Verdict
GPT-5 Image Mini is the best value: score 7.7 at $0.045/image ($20 for 450 genres). Most consistent UI-native style, clean minimalism that fits Musify's card layout perfectly.
Riverflow V2 Pro has the highest quality (8.4) at $0.15/image ($68 for 450). 3x the price of GPT-5 Mini for +0.7 score. Worth it only if budget allows.
Avoid: GPT-5 Image full ($96, no gain over Mini). Seedream 4.5 ($18, but ignores instructions). Nano Banana 2 (inconsistent quality).
Rock — Popular
Nano Banana 2$0.068
Q7S7F8
Avg7.3
Good jagged waveform concept, palette on-brand. Slightly rough detail.
Seedream 4.5$0.040
Q6S7F5
Avg6.0
Dramatic but renders hex color codes as visible text. Instruction violation.
GPT-5 Img Mini$0.045
BEST
Q8S9F9
Avg8.7
Elegant minimal crack with molten glow. Perfect negative space for UI card.
GPT-5 Image$0.222
Q9S8F9
Avg8.7
Clean blue lightning bolt on dark rock. Polished but 5x the price of Mini.
Riverflow V2 Pro$0.150
Q8S8F7
Avg7.7
Dynamic fiery waveform through fractured rock. Energetic, slightly busy.
Nano Banana Pro$0.142
Q8S8F7
Avg7.7
Bold zigzag lightning in blue/orange on stone. Eye-catching, slightly game-art.
Jazz — Popular
Nano Banana 2$0.068
Q8S9F9
Avg8.7
Beautiful flowing copper on blue-gray. Best NB2 result across all genres.
Seedream 4.5$0.040
Q6S6F4
Avg5.3
Renders literal saxophone (violates "no instruments") + hex codes as text. Fail.
GPT-5 Img Mini$0.045
Q7S7F8
Avg7.3
Clean dark waves, copper highlights. Good palette but maybe too dark/sparse.
GPT-5 Image$0.200
Q8S8F8
Avg8.0
Flowing golden S-curve on navy. Elegant and sophisticated, well-composed.
BEST
Riverflow V2 Pro$0.150
Q9S9F8
Avg8.7
Stunning smoky golden swirls with particle textures. Painterly and evocative.
Beautiful layered waves + botanical shadows + golden hour. GPT-5's best result.
BEST
Riverflow V2 Pro$0.150
Q10S9F9
Avg9.3
Exquisite layered waves + palm leaves + guitar strings. Best single image in the test.
Nano Banana Pro$0.139
Q7S7F7
Avg7.0
Flowing waves with leaf geometry, pastel colors. Nice but flat, pink accent feels off.
Prompt Template Used
You are an elite art director creating the definitive visual identity for a premium music streaming platform's genre category system.
Generate exactly ONE square image (1:1 aspect ratio) that becomes the iconic thumbnail for the "{GENRE}" music genre.
## Strict Visual Rules
- Abstract, evocative digital artwork — NO literal instruments, NO musicians, NO people, NO hands, NO faces
- Foundation palette: cool blue-grays (#607D8B, #495057, #868e96) — then add selective genre-appropriate accent colors
- MUST have strong tonal contrast — the image appears at 50% grayscale by default on the platform, so it needs to be visually compelling even desaturated
- Modern, gallery-quality, with confident use of negative space
- ZERO text, ZERO letters, ZERO words, ZERO watermarks, ZERO logos, ZERO borders
- No busy clutter — this is a refined UI thumbnail, not a poster
- Smooth gradients, clean geometry, organic textures — NOT photographic, NOT collage
## Creative Direction: "{GENRE}"
{genre-specific vibe description}
Produce one breathtaking image that any music lover would instantly associate with {GENRE}.
