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Pick a model, run it in bulk

BulkImagen runs 12 image models from 6 labs on one credit balance — 1 to 20 credits per image, and no provider API keys of your own. Compare what each one costs and supports, then send a whole prompt list through it.

Not sure which one? Start here

Most popularOpenAI

GPT Image 2

GPT Image 2 is where most batches here start: it works the brief out before it draws, and it is the only model that can hand back a transparent background.

Cheapest 4KByteDance

Seedream 5.0 Lite

Seedream 5.0 Lite renders 4K for 5 credits an image, the lowest 4K rate here. 7 of the 12 models offer a 4K tier.

Most reference imagesOpenAI

GPT Image 2.5

GPT Image 2.5 accepts up to 8 reference images in one call — the highest cap on the platform — when a batch has to match an existing look.

Side by side

Every model, every spec

These numbers are read from the generation registry, so they are what a batch actually charges. Credits are billed per finished image, at the rate for the resolution you pick.

ModelMade byCredits / imageResolutionsAspect ratiosReference imagesPrompt limit
OpenAIGPT Image 2OpenAI1K 5 · 2K 10 · 4K 201K · 2K · 4K15up to 420,000 chars
OpenAIGPT Image 2.5OpenAI1K 5 · 2K 10 · 4K 161K · 2K · 4K12up to 820,000 chars
GeminiNano Banana ProGoogle1K 5 · 2K 6 · 4K 101K · 2K · 4K10up to 410,000 chars
GeminiNano Banana 2Google1K 4 · 2K 6 · 4K 101K · 2K · 4K14up to 420,000 chars
GeminiNano Banana 2 LiteGoogle31K14up to 420,000 chars
GeminiNano Banana 2.1Google1K 4 · 2K 6 · 4K 101K · 2K · 4K14up to 420,000 chars
ByteDanceSeedream 4.5ByteDance2K 6 · 4K 62K · 4K8up to 43,000 chars
ByteDanceSeedream 5.0 LiteByteDance2K 5 · 4K 52K · 4K8up to 43,000 chars
ByteDanceSeedream 5.0 ProByteDance1K 6 · 2K 121K · 2K8up to 45,000 chars
GrokGrok Imagine 2.0xAI41K5up to 15,000 chars
FluxFlux 2 ProBlack Forest Labs1K 5 · 2K 61K · 2K7up to 85,000 chars
QwenZ-ImageAlibaba11K5Text only1,000 chars

Aspect-ratio counts leave out the automatic option some models offer. Reference-image limits apply per call. If an image ends up failing, its credits go back to your balance.

Model guides

Longer write-ups for the models people search for by name, each with the batch form already set up for that model.

Gemini

Nano Banana

Nano Banana Pro, Nano Banana 2 and 2 Lite sit on one form here. Pick the tier a job deserves, load a prompt list, and let a bulk nano banana run fill the grid.

Text renderingConsistent subjectsSearch groundingByteDance

Seedream

ByteDance ships three Seedream models with three different strengths. Compare them, then run one bulk seedream batch across your whole prompt list.

Layout & postersPhotorealismMultilingual textOpenAI

GPT Image 2

OpenAI's gpt-image-2 thinks before it draws. This bulk GPT Image generator sends a whole prompt list through that pass in one batch and hands back a single ZIP.

Transparent backgroundsReasons firstText renderingCharts & infographicsFlux

Flux 2 Pro

Black Forest Labs' realism specialist, wired to a prompt list. A bulk flux 2 run takes the deepest reference stack here and returns the whole set at once.

PhotorealismDeep reference stackConsistent subjectsGrok

Grok Imagine

Grok Imagine 2.0 is xAI's edit-first image model, ranked second on both image Arenas in August 2026. Run bulk grok imagine batches and export a ZIP.

Edit-firstLayout & postersAd variantsQwen

Z-Image

Z-Image is Tongyi-MAI's 6B Apache-2.0 text-to-image model, strong on bilingual lettering. Run bulk z-image batches from one prompt list, export a ZIP.

Cheapest per imageOpen weightsMultilingual textOpenAI

GPT Image 2.5

GPT Image 2.5 is OpenAI's newest image model: two variants, up to 8 reference images, 1K–4K. Run bulk GPT Image 2.5 batches from a prompt list, download a ZIP.

Reasons firstText renderingDeep reference stackFollows the briefGemini

Nano Banana 2.1

Nano Banana 2.1 is Google's update to Nano Banana 2: better image quality, text rendering and multi-turn consistency at Flash speed. Run it on a prompt list.

Text renderingConsistent subjectsSearch grounding

Model questions

Something we didn't cover? Email support@bulkimagen.com

  • For large, cost-sensitive runs, Z-Image at 1 credit an image is the cheapest option here. For everyday work the form defaults to GPT Image 2. If you need 4K, GPT Image 2, GPT Image 2.5, Nano Banana Pro, Nano Banana 2, Nano Banana 2.1, Seedream 4.5, and Seedream 5.0 Lite offer a 4K tier.
  • Z-Image, at 1 credit per image. Across the catalogue, rates run from 1 to 20 credits an image depending on the model and the resolution you choose.
  • GPT Image 2, GPT Image 2.5, Nano Banana Pro, Nano Banana 2, Nano Banana 2.1, Seedream 4.5, and Seedream 5.0 Lite. The rest top out at 1K or 2K — the table above lists the tiers each model offers, and the price of every tier.
  • 11 of the 12. GPT Image 2.5 takes the most at 8 per call. Z-Image is text-only, and a batch that attaches references to it is rejected before any credits are charged.
  • Per finished image, at the model's rate for the resolution you pick — 1 to 20 credits. There is no per-batch fee and no monthly minimum, and credits for images that fail are returned automatically.
  • Yes. The model is chosen per batch on the form, not tied to your plan, so a common pattern is a cheap first pass to find the prompts that work, then a rerun of the keepers on a stronger model.
  • No. BulkImagen holds the provider keys and bills you in credits, so every model in the table is available as soon as you sign in — including ones whose APIs are otherwise waitlisted or region-limited.