Pick Nano Banana 2 if you want the best out-of-the-box realism, reliable text, and Flash speed without touching infrastructure. Pick Flux 2 if you want open weights you can self-host, fine-tune on your own data, and run at the lowest per-image cost. One optimizes for quality-with-zero-setup; the other for control and ownership.
Side by side
| Nano Banana 2 | Flux 2 | |
|---|---|---|
| Maker | Black Forest Labs | |
| Best at | Realism, text, speed | Control, fine-tuning |
| Arena Elo | ~1,360 (top) | ~1,265 (Pro) |
| Open weights | No | Yes (Dev variant) |
| Self-host | No | Yes |
| Speed | ~3–5 sec | Fast, tier-dependent |
| Hosted API cost | From $0.045 ($0.022 batch) | From $0.03 (Schnell) |
| Self-host cost | — | ~$0.015/image |
Nano Banana 2
Nano Banana 2 (Gemini 3.1 Flash Image) is the realism leader and tops blind arena testing. It renders legible text, outputs up to 4K, generates in about four seconds, and takes up to 14 reference images for consistency. As a hosted Google model it's the fastest path to great images: free in the Gemini app, cheap on the API, nothing to run.
The limits are ecosystem and control. You can't self-host it, you can't fine-tune it on private data, and every output carries a SynthID watermark. If you just want top-tier images with minimal effort, none of that matters. Read the full Nano Banana 2 review for the deeper look.
Flux 2
Flux 2, from Black Forest Labs, is the flexibility play. Its Pro tier is a strong photorealism model in its own right, but the real draw is the open-weight Dev variant you can download, self-host, and fine-tune — the thing Nano Banana 2 will never let you do. For teams with a distinct visual identity or strict data-privacy needs, that's decisive.
On cost, self-hosted Flux can hit roughly $0.015 per image if you keep GPUs busy, undercutting any hosted option — but you own the ops burden. Hosted Flux endpoints start around $0.03. See our Flux 2 review and Flux 2 pricing for the full picture.
Which should you pick?
Pick Nano Banana 2 if you want the best realism and text with zero setup, a free tier, and a simple hosted API — most marketers, creators, and product teams should start here.
Pick Flux 2 if you need open weights, on-prem or private-cloud hosting, custom fine-tunes, or the absolute lowest per-image cost at scale. It's the choice when control and ownership outweigh raw convenience. For the broader field, see Nano Banana 2 vs Midjourney and our best AI image generators ranking.
Frequently Asked Questions
Is Nano Banana 2 better than Flux 2?
Nano Banana 2 leads on out-of-the-box realism, text, and speed, and tops the arena. Flux 2 wins on flexibility — open weights to self-host and fine-tune, plus the cheapest per-image cost if you run it yourself.
Can you self-host Nano Banana 2?
No. It's a hosted Google model, available only via the Gemini app and API. Flux 2 offers open-weight variants you can run on your own hardware.
Which is cheaper per image?
Self-hosted Flux 2 can be cheapest, from around $0.015, but you pay for GPUs and ops. Nano Banana 2 is cheapest as a hosted option, from about $0.045 standard or $0.022 in batch.
Which is better for fine-tuning?
Flux 2. Its open Dev weights let you fine-tune on your own images and styles; Nano Banana 2 doesn't support custom training.
Which renders text better?
Nano Banana 2 has the edge on reliable, legible in-image text, though Flux 2 also handles text better than most earlier models.
Which for a privacy-sensitive project?
Flux 2, because you can self-host the open weights and keep data in your own environment rather than sending it to a hosted API.