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Stability AI

Stable Diffusion

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SECOND MODEL

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OverviewStable DiffusionSecond model
PriceSelf-host: Free under Community License for eligible users · API from $0.025/image—
Free planYes — self-hosted Community License for eligible users; API includes 25 starter credits—

Key comparison

SpecificationStable DiffusionSecond model
Starting PriceSelf-host: Free under Community License for eligible users · API from $0.025/image (SD 3.5 Flash)Not disclosed
Text-to-ImageStable Diffusion 3.5 Large / Large Turbo / Medium / Flash text-to-imageNot disclosed
Image EditingStability AI API: Erase · Inpaint · Outpaint · Search & Replace · Recolor · Replace Background & RelightNot disclosed
Maximum ResolutionSD 3.5 Large: ~1 MP · SD 3.5 Medium: 0.25–2 MP · Stable Image Ultra API: 1 MP native · dedicated upscalers output up to 4KNot disclosed
Reference ImagesImage-to-image + Control Style/Structure/Sketch services; self-hosted reference workflows depend on implementationNot disclosed
Character Consistency
vs
No single native SD 3.5 character-lock feature · commonly implemented through fine-tunes, LoRAs and reference/control workflows
Not disclosed
Text RenderingImproved typography and prompt adherence in SD 3.5; Ultra is optimized for stronger typographyNot disclosed
PhotorealismExcellent with Stable Image Ultra / SD 3.5 Large; quality varies by model and fine-tuneNot disclosed
UpscalingCreative and Conservative Upscalers to 4K · Fast Upscaler 4× up to 4 MPNot disclosed
API AccessStability AI REST v2beta · Generate / Edit / Control / Upscale servicesNot disclosed
Commercial UseCommunity License free for organizations under $1M annual revenue; Enterprise License required above $1M for covered Core ModelsNot disclosed

Pricing

2 specifications +
SpecificationStable DiffusionSecond model
Free PlanCommunity License: free for non-commercial use and commercial use below $1M annual revenue · Developer API starts with 25 free creditsNot disclosed
Usage Limits / CreditsAPI: 1 credit = $0.01 · SD 3.5 Flash 2.5 credits · Medium 3.5 · Large Turbo 4 · Large 6.5 · Ultra 8 per imageNot disclosed

Overview

3 specifications +
SpecificationStable DiffusionSecond model
Primary Use CaseCustomizable AI image generation · self-hosting · production image workflowsNot disclosed
Best ForDevelopers / Creators / Fine-tuning / Local deployment / Marketing / ProductionNot disclosed
PlatformsSelf-hosted/local · Stability AI API · Stable Assistant · cloud partnersNot disclosed

Image Generation

4 specifications +
SpecificationStable DiffusionSecond model
Image-to-ImageStable Image generation endpoints accept a starting image with adjustable strength; ecosystem also supports custom img2img workflowsNot disclosed
Aspect RatiosMultiple API aspect ratios · self-hosted workflows can use model-supported custom resolutionsNot disclosed
Batch GenerationSelf-hosted batching supported by implementation · API generation is request/credit basedNot disclosed
Prompt EnhancementStrong prompt adherence; negative prompts supported on API endpointsNot disclosed

Image Editing

6 specifications +
SpecificationStable DiffusionSecond model
InpaintingDedicated Stability AI Inpaint API + customizable self-hosted workflowsNot disclosed
OutpaintingDedicated Stability AI Outpaint APINot disclosed
Object RemovalDedicated Erase Object APINot disclosed
Background RemovalDedicated Remove Background APINot disclosed
Background ReplacementReplace Background & Relight APINot disclosed
Generative FillInpaint / Outpaint services for masked and extended generative contentNot disclosed

Control & Consistency

4 specifications +
SpecificationStable DiffusionSecond model
Style ControlControl Style · Style Transfer · self-hosted LoRA/fine-tuning and prompt-based style controlNot disclosed
Style ReferenceControl Style / Style Transfer API plus self-hosted reference and adapter workflowsNot disclosed
Pose / Composition ControlControl Sketch / Structure APIs · advanced pose controls available through ecosystem implementationsNot disclosed
Seed ControlSeed parameter supported in Stability AI generation API and standard self-hosted diffusion workflowsNot disclosed

Quality & Design

3 specifications +
SpecificationStable DiffusionSecond model
Typography / Logo GenerationRaster typography/design generation supported; quality depends on model and promptNot disclosed
Vector GenerationNo native SVG/vector output in core Stable Diffusion 3.5 image modelsNot disclosed
Transparent BackgroundRemove Background API supports isolated foreground workflows; native transparent generation is not a core SD 3.5 base-model featureNot disclosed

Models & Customization

4 specifications +
SpecificationStable DiffusionSecond model
Available ModelsStable Diffusion 3.5 Large · Large Turbo · Medium · Flash · Stable Image Ultra/Core · legacy SDXLNot disclosed
Model SelectionChoose SD 3.5 variant by quality/speed/hardware needs; Stable Image services provide optimized hosted alternativesNot disclosed
Custom ModelsHighly customizable · supports community fine-tunes, LoRAs and derivative workflows under applicable license termsNot disclosed
Model TrainingFine-tuning and LoRA workflows supported; Stability AI Enterprise also offers custom model training upgradesNot disclosed

Developer & Integration

2 specifications +
SpecificationStable DiffusionSecond model
IntegrationsSelf-hosted ecosystem · Stability AI API · Stable Assistant · cloud partnersNot disclosed
Automation SupportREST API with asynchronous polling support · self-hosted pipelines can be automatedNot disclosed

Commercial & Business

2 specifications +
SpecificationStable DiffusionSecond model
Team PlanNo standard seat-based Stable Diffusion team plan · organizations can use API credits or self-host under applicable licenseNot disclosed
Enterprise PlanEnterprise License with commercial deployment, implementation support and optional custom model trainingNot disclosed

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