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The Stack / Image
Stable Diffusion
03 CreationYes for builders who want image generation they own — Stable Diffusion's open weights run locally, fine-tune freely, and power a massive LoRA/ComfyUI ecosystem. Stability shipped SD4 in April 2026, its first full-generation model since SD3.5 and a real architecture change (U-Net to diffusion transformer, plus a dedicated text-rendering module) that closes ground on FLUX rather than just adding another checkpoint.
The job in the stack
The self-hosted image seat: open-weight generation with total control, zero marginal cost, and the largest tuning ecosystem.
Pricing
| Plan | Price | Notes |
|---|---|---|
| Open weights (local) | $0 | SD4 Base, SDXL, SD3.5 on your GPU |
| Stability API | $0.03–$0.08/image | Credits at $0.01 each; Stable Image Core $0.03, Ultra $0.08, SD3.5 Medium $0.035 |
Pricing verified 2026-07-09. Plans change — the source of truth is Stable Diffusion's own pricing page.
Models & versions
- SD4 Base / SD4 UltraReleased April 2026 — diffusion transformer architecture, native 4096x4096, dedicated text-rendering module; Ultra available via API and Stable Assistant, weights for self-hosting followed late April 2026
- SD3.5 / SDXLPrior-generation open releases still widely used; ComfyUI/A1111 ecosystems and huge LoRA library built on them
The honest read
What works
- +Fully open: local, private, unlimited generation
- +Unmatched community ecosystem of fine-tunes and workflows
- +The customization ceiling — train exactly your style
What breaks
- −SD4 is new enough (April 2026) that independent head-to-head benchmarks against FLUX are still thin
- −Local setup demands GPU + tooling comfort — SD4 Ultra's full resolution wants serious VRAM
- −Stability AI's commercial licensing tiers need reading
Use it for
- →Privacy-bounded generation that can't leave your machine
- →Custom-trained styles and characters at zero marginal cost
- →Builders embedding image gen without per-image fees
Skip it if
- ×You want an app, not a model — Leonardo/OpenArt serve SD-class models hosted
- ×Peak quality per prompt — that's Midjourney or FLUX
Questions operators ask
?Stable Diffusion or FLUX?
FLUX still leads on out-of-box photorealism and prompt adherence, but SD4's move to a diffusion transformer and its dedicated text-rendering module narrow the gap that defined the SD3.5 era — especially for legible in-image text, which was SD's weakest spot. SD still wins on ecosystem depth: the tutorials, LoRAs, and workflows accumulated since 2022. New local setups should benchmark SD4 against FLUX for their specific use case rather than assume FLUX by default.
What changed
- Verified and released from staging. Real change found: Stability shipped SD4 (Base + Ultra) in April 2026 — first full-generation release since SD3.5, moving from U-Net to a diffusion transformer with a dedicated text-rendering module. Updated models, pricing, and the FLUX comparison to account for it.
- Added to the stack (self-hosted image seat). Seeded from January 2026 baseline; pricing pending fresh verification by the update loop.
Give Stable Diffusion a job
The self-hosted image seat: open-weight generation with total control, zero marginal cost, and the largest tuning ecosystem.
Try Stable Diffusion →Alternatives with different jobs
Midjourney
03 CreationThe hero-image seat: thumbnails, brand visuals, and any image where aesthetic quality is the deliverable.
Leonardo.Ai
03 CreationThe volume-image seat: daily-token generation, style consistency, and control features for repeatable asset production.
OpenArt
03 CreationThe multi-model image seat: one interface over many image models, with character and style consistency for series work.