What Each Uncensored Image API Won't Let You Control
Picking an uncensored image API usually gets argued on output quality, which is subjective and hard to test. The request bodies are not. Pull the specs for alibaba/qwen-image-3-t2i-spicy, bytedance/seedream-5.0-pro-t2i-spicy, and alibaba/z-image-turbo-t2i, and the fields each one leaves out decide more about your workflow than any sample gallery.
Key Takeaways
- Seedream 5.0 Pro Spicy takes four fields and has no seed — of these three, only its output cannot be reproduced.
- Qwen Image 3 Spicy alone returns several images from one call (n, 1 to 6).
- Seedream has no aspect_ratio field but still reaches 9:16 — the ratio lives inside its size enum.
- None of the three accept a negative_prompt.
What Each Endpoint Actually Requires
Qwen Image 3 Spicy | Seedream 5.0 Pro Spicy | Z-Image Turbo | |
Required fields | model, prompt, size, aspect_ratio | model, prompt, size | model, prompt, size |
How you set the ratio | dedicated field, 15 values | inside size, 8 ratios | not selectable, 3 fixed sizes |
seed | yes | no | yes |
n (images per call) | 1–6 | no | no |
Longest edge | 2k | 3136 px | 1024 px |
negative_prompt | no | no | no |
All three post to /v1/images/generations/async and are polled by task ID, so switching between them changes the body, not the transport.
Seedream Gives You the Biggest Canvas and the Least Control
The seedream-5.0-pro-t2i-spicy request body has four properties: model, prompt, size, output_format. One absence matters more than the rest — there is no seed.
Without a seed, a result you like cannot be re-rendered, re-rendered at another size, or nudged a word at a time from a fixed start. If your workflow is "generate, review, then regenerate the keeper larger," it does not exist here.
What you get in exchange is scale: 3136 px on the long edge, against 2k for Qwen and 1024 px for Z-Image.
A Missing Field Is Not a Missing Capability
Seedream has no aspect_ratio key, and the obvious inference — that you are stuck with whatever shape it defaults to — is wrong. Its size enum carries 16 values covering eight ratios at two scales: 1:1, 4:3, 3:4, 16:9, 9:16, 3:2, 2:3, and 7:3. 1584x2816 divides to 0.5625, exactly 9:16.
Z-Image is the genuine case of a missing capability. Its size is three fixed values — 1024x768, 768x1024, 1024x1024 — covering 4:3, 3:4, and 1:1. Neither 16:9 nor 9:16 exists on it at any resolution.
Qwen sits at the other end with 15 ratio values, including 9:21 and 21:9. It also makes size and aspect_ratio both required with no defaults — omit either and the call fails.
What Only Qwen Gives You, and What Nobody Does
Qwen Image 3 Spicy takes n, an integer from 1 to 6. On the other two, "give me six variations" means six calls from your own loop, with your own concurrency and retries. The Pro tier behaves identically — qwen-image-3-pro-t2i-spicy has the same required fields and enums, only the model string differs.
What none of them have is negative_prompt. Steering is affirmative only: state the anatomy, lighting, and focus you want rather than listing artifacts to exclude. Qwen adds one lever the others lack, prompt_expansion_enable, which defaults to true and rewrites your prompt before generation — switch it off when you want a prompt taken literally.
FAQ
Can I reproduce an image on Seedream 5.0 Pro Spicy?
No. It has no seed field, so an identical prompt returns a fresh draw each time. Qwen Image 3 Spicy and Z-Image Turbo both accept a seed.
How do I get a 9:16 image from Seedream if it has no aspect_ratio field?
Pass 1584x2816 as the size. Its enum holds 16 values covering eight ratios, and that one is exactly 9:16.
Which of these endpoints returns multiple images per call?
Only Qwen Image 3 Spicy, through n (1 to 6). The other two return one image per request.
Run All Three on One Key
All three are live on Siray behind a single API key and one normalized request format, so testing a prompt across them is a change to the model string. Create a free Siray account and compare them on your own prompts. Background: Z-Image Turbo, the Qwen Image 3 series, and Seedream 4.5 vs 5.0 Pro Spicy.
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