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Smart Model Select
Best model for your prompt
Send your prompt with budget, speed, and quality constraints. The API analyzes your requirements and recommends the best model with alternatives and reasoning. Powered by structured scoring, not LLM opinion.
How Smart Model Select Works
Smart Model Select analyzes your prompt and constraints to recommend the best AI model from FairStack's catalog of 72+ models. The system decomposes your prompt into task features -- photorealism, text rendering, style fidelity, speed requirements, budget ceiling -- then scores each eligible model against those features using structured capability data. The recommendation includes a primary pick, ranked alternatives, and reasoning for each suggestion.
Developers building AI-powered apps use this endpoint to abstract away model selection entirely. Instead of hardcoding a model, your app sends the user's prompt and budget to Smart Model Select, gets the best model back, and generates with it. This future-proofs your integration -- as new models are added to FairStack, your app automatically benefits without code changes. It is also useful for building model comparison tools and cost optimization systems.
Include specific constraints for the best recommendations. Specify your maximum budget, minimum quality requirements, and whether speed matters. If your use case has a specific style need (photorealism, illustration, anime), mention it in the prompt. The endpoint is free to call and adds negligible latency to your pipeline.
How it works
1
Send a POST /v1/select-model with prompt and constraints
2
AI scores models against your requirements
3
Get recommended model + alternatives + reasoning
What you'll get
High-resolution output ready for social, web, or print
Multiple style variations available per generation
Commercial-use license included with every output
PNG, JPG, or WebP format at up to 4K resolution
Instant download -- no watermarks, no waiting
Consistent quality powered by state-of-the-art AI models
Frequently asked questions
Do I need a subscription to use Smart Model Select?
No. FairStack uses pay-per-use pricing. Add funds to your account and use any tool whenever you need it. There is no subscription, no monthly commitment, and no minimum spend.
What file formats does Smart Model Select support?
Smart Model Select outputs PNG, JPG, and WebP. You can download results instantly after generation. All outputs are full quality with no watermarks.
How long does Smart Model Select take?
Most generations complete in 2-10 seconds. Processing time depends on the complexity of your input and the selected quality settings. You can monitor progress in real time.
Can I use Smart Model Select outputs commercially?
Yes. All outputs generated on FairStack include a commercial-use license. You can use them in client work, products, marketing materials, social media, and any other commercial context.
What does the Smart Model Select response include?
The response includes the recommended model slug, confidence score, reasoning text, up to 3 ranked alternatives with their own scores and reasoning, and the estimated cost for each option. You can pass the model slug directly to the generation endpoint.
Can I use Smart Model Select in production commercial applications?
Yes. The endpoint is designed for production use. It is free, fast (typically under 200ms), and has no rate limits beyond standard API throttling. Use it to power model selection in any commercial product.
Does Smart Model Select work for all modalities?
Yes. It covers image, video, voice, and music models. Specify the modality in your request to narrow the recommendation to relevant models, or leave it open and the system will infer the modality from your prompt.
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