Imagen 4 Fast Prompts & Examples

Imagen 4 Fast is Google's speed-optimized Imagen tier. Same compositional intelligence as the higher tiers, faster generation, lower cost. The natural pick when you want Google quality at Grok Imagine pricing.

This page collects prompts that consistently produce strong output from Imagen 4 Fast when called via the AetherWave MCP server. Each example is structured to highlight what makes the prompt work, so you can adapt the pattern to your own scenes.

Tested prompt examples

These are real prompts that work well. The italics under each example is the actual text to pass via Claude Code.

Prompt structure that works

For Imagen 4 Fast, the prompts that perform best follow a predictable structure:

• Subject first: lead with the main thing in the frame ("vintage Roland synthesizer", "musician in a rain-soaked alley")
• Style and lighting next: how it should look ("photorealistic", "35mm film grain", "soft purple bokeh", "golden hour")
• Composition and aspect: framing cues ("close-up", "wide shot", "16:9", "magazine-quality")
• Mood and atmosphere last: the emotional pull ("moody", "cinematic", "dreamlike")

How to use these prompts

Once you have the AetherWave MCP installed in Claude Code, just paste any of the prompts above. The agent will call aetherwave_generate_image with model: "imagen-4-fast" and return the asset URL.

Install in one command:

Free API key at your Profile page (Developer tab). Outputs auto-save to your Cloudflare R2 gallery.

When to pick Imagen 4 Fast

Imagen 4 Fast is the right model when your prompt matches its strengths: fast budget photoreal generation.

For other intents, the AetherWave MCP rubric in aetherwave_generate_image's description routes the agent to the right model automatically. Run aetherwave_list_image_models from Claude Code to see the full live catalog.

Comparison

vs grok-imagine-t2i at 6 cr / 2 images: Imagen Fast is 5 cr for 1 image; Grok is 6 cr for 2. Pick Imagen Fast for one fast deterministic shot; Grok when you want a pair to choose between.

Frequently Asked Questions

What kind of prompts work best with Imagen 4 Fast?

Prompts matching its core strength: fast budget photoreal generation. Specific subject, clear style cues, aspect ratio in the prompt all improve output quality.

How long should a Imagen 4 Fast prompt be?

30 to 80 words is the sweet spot. Lead with the subject, follow with style and composition, finish with technical specs.

Can I use these prompts directly via Claude Code?

Yes. After installing the AetherWave MCP server, paste any prompt into Claude Code. The agent will call aetherwave_generate_image with model: "imagen-4-fast" and return the finished asset.