Which AI Image Model Should You Use? A Practical 2026 Guide

There is no single best AI image model — there is a best model per job. After running thousands of generations across the models in our catalog, here is the honest decision guide we use ourselves.

The short answer

| You need | Use | | --- | --- | | Cheap, fast drafts | Z-Image Turbo | | A reliable everyday default | Nano Banana | | Text inside the image | GPT Image 2 | | Photorealism / cinematic looks | Seedream 5.0 | | The best final render, up to 4K | Nano Banana Pro | | Editing an existing photo | Nano Banana or GPT Image 2 |

Full specs and per-image credit pricing for every model are on the models page.

Draft cheap, finish expensive

The single biggest credit-saving habit: don't iterate on a flagship model. Composition, framing, and prompt wording problems show up identically on a 1-credit draft and a 42-credit final.

Z-Image Turbo generates in 5–10 seconds at one credit per image. Run five variations, pick the winning direction, then re-run that exact prompt on Nano Banana Pro or GPT Image 2 at high resolution. You get the flagship result for a fraction of the total spend.

When text matters, nothing beats GPT Image 2

Posters, packaging, signage, UI mockups, memes with captions — most models produce melted, misspelled letters. GPT Image 2 renders clean, correctly spelled typography, and it takes layout instructions ("headline top-left, logo bottom-right") literally. Put the exact wording in quotes and keep it short.

Its sibling GPT Image 1.5 is the budget way to get OpenAI-grade prompt understanding — its Medium tier costs less than a Nano Banana generation.

When realism matters, Seedream speaks photography

Seedream 5.0 produces images that read as shot, not generated: film-like lighting, natural skin, believable materials. It responds to camera language — lens lengths, golden hour, anamorphic haze — better than style adjectives.

It also has the catalog's best pricing quirk: 2K and 4K cost the same credits. If you need affordable true-4K output, this is the answer. Seedream 4.5 adds an editing variant at the same flat-price structure.

When editing, the model must respect the original

Editing is a different skill from generation: the model has to change only what you asked. This is Nano Banana's signature — it preserves faces, products, and layout unusually well, which is why it powers our AI Image Editor and Background Replace defaults.

For edits involving text ("replace the headline, keep the design"), use GPT Image 2. For maximum-fidelity edits on high-stakes assets, Nano Banana Pro accepts image input too.

The workflow that ties it together

1. Draft on Z-Image Turbo until the composition works.
2. Decide the finisher: text → GPT Image 2, realism → Seedream 5.0, everything else → Nano Banana Pro.
3. Render the final at 2K–4K with the proven prompt.
4. Touch up with an edit model instead of regenerating from scratch.

One credit balance covers every model, so switching costs nothing. Compare all models side by side or jump straight into the generator.