Testing Grok Imagine's 15-20x Faster Image Generation XAI's Grok Imagine image generation model, now available on Puter.js, claims to be 15-20x faster than competitors. Puter.js tested both standard and quality tiers against GPT Image 2 and Nano Banana models, measuring end-to-end browser times. The standard Grok Imagine costs $0.02 per image, while the quality version is $0.05. Testing Grok Imagine's 15-20x Faster Image Generation We recently added Grok Imagine Image /ai/x-ai/grok-imagine-image/ to Puter.js. It's xAI's /ai/x-ai/ text-to-image model, and it replaces the Grok-2-Image /ai/x-ai/grok-2-image/ model we supported before. There are two versions. The standard one is Grok Imagine Image at $0.02 per image. The other is Grok Imagine Image Quality /ai/x-ai/grok-imagine-image-quality/ , which xAI positions as the higher-quality option, at $0.05 per image. That's 2.5x the price of the standard model. One thing to watch when you add Grok Imagine: choosing the quality version over the standard one makes each image 2.5x more expensive for your users. On Puter's User-Pays Model https://docs.puter.com/user-pays-model/ that cost lands on each user rather than on you. xAI claims Grok Imagine Image is the fastest AI image generator in the world https://grok.com/supergrok/imagine , up to 15 to 20x faster than other models. We tested that claim. Testing the Speed Claim We compared both Grok tiers against a few other current image models: GPT Image 2 /ai/openai/gpt-image-2/ in its low and high quality modes, Nano Banana 2 /ai/google/gemini-3.1-flash-image/ , and Nano Banana Pro /ai/google/gemini-3-pro-image/ . We used the same prompt for all of them and timed each one end to end from the browser, averaging three runs each. These are the times a real user waits for, network and queueing included, not raw GPU time. Here's the code we used. You can run it yourself in the Puter playground https://docs.puter.com/playground/ , or drop it into a page on your own site: