HiDream: I1-Fast

hidream-ai/hidream-i1-fast

Access I1-Fast AI image generation using Puter.js API.

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Model Card

HiDream I1 Fast is the lowest-latency variant of HiDream AI's 17-billion-parameter text-to-image model family, completing generation in as few as 14-16 diffusion steps.

Like the Dev variant, it is distillation-trained and does not require negative prompts. It is the best-fit variant for latency-sensitive API integrations, delivering strong image quality for its step count.

I1 Fast is the right choice for real-time generation features, high-throughput batch pipelines, or user-facing products where responsiveness is the primary constraint. Maximum fidelity is reserved for the Full variant.

Cost Per Image $0.0032

per generation

Configuration N/A

resolution

Release Date Apr 14, 2025

 

Code Example

Use I1-Fast in your app with the Puter.js AI API — no API keys or setup required.

// npm install @heyputer/puter.js
import { puter } from '@heyputer/puter.js';

puter.ai.txt2img("A serene mountain landscape at sunset", {
    model: "hidream-ai/hidream-i1-fast"
}).then(image => {
    document.body.appendChild(image);
});

<html>
<body>
    <script src="https://js.puter.com/v2/"></script>
    <script>
        puter.ai.txt2img("A serene mountain landscape at sunset", {
            model: "hidream-ai/hidream-i1-fast"
        }).then(image => {
            document.body.appendChild(image);
        });
    </script>
</body>
</html>

More AI Models From HiDream

Find other HiDream models →

Image

I1-Dev

HiDream I1 Dev is a guidance-distilled, 17-billion-parameter text-to-image model from HiDream AI, built on a sparse Diffusion Transformer architecture with dynamic Mixture-of-Experts layers. It runs in approximately 28 diffusion steps, placing it between the Full and Fast variants in the speed-quality tradeoff. Because it is distillation-trained, negative prompts are not required — the classifier-free guidance scale should be set to 1.0 during sampling. I1 Dev is well-suited for iterative development workflows, concept exploration, and production pipelines where response time matters but image fidelity cannot be fully sacrificed. It also supports LoRAs for style control.

 Image

I1-Full

HiDream I1 Full is the flagship text-to-image model from HiDream AI, a 17-billion-parameter sparse Diffusion Transformer that delivers the highest output quality in the I1 family through 50+ diffusion steps. On verified benchmarks, it scores 0.83 on GenEval (vs. 0.67 for DALL-E 3 and 0.66 for FLUX.1-dev), 85.89 on DPG-Bench for prompt adherence, and 33.82 on HPS v2.1 (vs. 32.47 for FLUX.1-dev and 31.44 for DALL-E 3). It supports negative prompts with a guidance scale of 5.0 for finer output control. I1 Full is the best choice when image quality, prompt fidelity, and detail richness are the top priorities — ideal for asset generation, creative production, and high-stakes visual content pipelines.

Frequently Asked Questions

How do I use I1-Fast?

You can access I1-Fast by HiDream through Puter.js AI API. Include the library in your web app or Node.js project and start making calls with just a few lines of JavaScript — no backend and no configuration required.

Is I1-Fast free?

Yes, it is free if you're using it through Puter.js. With the User-Pays Model, you can add I1-Fast to your app at no cost — your users pay for their own AI usage directly, making it completely free for you as a developer.

What is the pricing for I1-Fast?
I1-Fast costs $0.0032 per image.
Price
Per image$0.0032
Who created I1-Fast?

I1-Fast was created by HiDream and released on Apr 14, 2025.

Does it work with React / Vue / Vanilla JS / Node / etc.?

Yes — the I1-Fast API works with any JavaScript framework, Node.js, or plain HTML through Puter.js. Just include the library and start building. See the documentation for more details.

Get started with Puter.js

Add I1-Fast image generation to your app without worrying about API keys or setup.

Read the Docs View Tutorials